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feat: add solutions to lc problem: No.2103
No.2013.Detect Squares
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‎solution/2000-2099/2013.Detect Squares/README.md

+108-1
Original file line numberDiff line numberDiff line change
@@ -63,22 +63,129 @@ detectSquares.count([11, 10]); // 返回 2 。你可以选择：
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<!-- 这里可写通用的实现逻辑 -->
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哈希表实现。
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<!-- tabs:start -->
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### **Python3**
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<!-- 这里可写当前语言的特殊实现逻辑 -->
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```python
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class DetectSquares:
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def __init__(self):
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self.mp = defaultdict(Counter)
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def add(self, point: List[int]) -> None:
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x, y = point
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self.mp[x][y] += 1
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def count(self, point: List[int]) -> int:
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x, y = point
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ans = 0
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if x not in self.mp:
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return ans
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xcnt = self.mp[x]
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for x1, counter in self.mp.items():
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if x1 != x:
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d = x1 - x
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ans += xcnt[y + d] * counter[y] * counter[y + d]
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ans += xcnt[y - d] * counter[y] * counter[y - d]
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return ans
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```
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### **Java**
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<!-- 这里可写当前语言的特殊实现逻辑 -->
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```java
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class DetectSquares {
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private Map<Integer, Map<Integer, Integer>> mp = new HashMap<>();
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public DetectSquares() {
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}
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public void add(int[] point) {
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int x = point[0], y = point[1];
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if (!mp.containsKey(x)) {
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mp.put(x, new HashMap<>());
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}
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mp.get(x).put(y, mp.get(x).getOrDefault(y, 0) + 1);
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}
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public int count(int[] point) {
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int x = point[0], y = point[1];
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int ans = 0;
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if (!mp.containsKey(x)) {
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return ans;
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}
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Map<Integer, Integer> xcnt = mp.get(x);
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for (Map.Entry<Integer, Map<Integer, Integer>> e : mp.entrySet()) {
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int x1 = e.getKey();
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Map<Integer, Integer> counter = e.getValue();
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if (x1 != x) {
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int d = x1 - x;
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ans += xcnt.getOrDefault(y + d, 0) * counter.getOrDefault(y, 0) * counter.getOrDefault(y + d, 0);
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ans += xcnt.getOrDefault(y - d, 0) * counter.getOrDefault(y, 0) * counter.getOrDefault(y - d, 0);
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}
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}
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return ans;
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}
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}
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/**
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* Your DetectSquares object will be instantiated and called as such:
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* DetectSquares obj = new DetectSquares();
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* obj.add(point);
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* int param_2 = obj.count(point);
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*/
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```
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### **C++**
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```cpp
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class DetectSquares {
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public:
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unordered_map<int, unordered_map<int, int>> mp;
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DetectSquares() {
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}
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void add(vector<int> point) {
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int x = point[0], y = point[1];
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++mp[x][y];
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}
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int count(vector<int> point) {
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int x = point[0], y = point[1];
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int ans = 0;
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if (!mp.count(x)) return ans;
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auto xcnt = mp[x];
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for (auto e : mp)
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{
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int x1 = e.first;
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auto counter = e.second;
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if (x1 != x)
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{
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int d = x1 - x;
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ans += xcnt[y + d] * counter[y] * counter[y + d];
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ans += xcnt[y - d] * counter[y] * counter[y - d];
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}
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}
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return ans;
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}
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};
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/**
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* Your DetectSquares object will be instantiated and called as such:
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* DetectSquares* obj = new DetectSquares();
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* obj->add(point);
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* int param_2 = obj->count(point);
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*/
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```
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### **...**

‎solution/2000-2099/2013.Detect Squares/README_EN.md

+106-1
Original file line numberDiff line numberDiff line change
@@ -62,13 +62,118 @@ detectSquares.count([11, 10]); // return 2. You can choose:
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### **Python3**
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```python
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class DetectSquares:
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def __init__(self):
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self.mp = defaultdict(Counter)
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def add(self, point: List[int]) -> None:
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x, y = point
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self.mp[x][y] += 1
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def count(self, point: List[int]) -> int:
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x, y = point
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ans = 0
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if x not in self.mp:
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return ans
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xcnt = self.mp[x]
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for x1, counter in self.mp.items():
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if x1 != x:
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d = x1 - x
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ans += xcnt[y + d] * counter[y] * counter[y + d]
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ans += xcnt[y - d] * counter[y] * counter[y - d]
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return ans
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```
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### **Java**
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```java
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class DetectSquares {
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private Map<Integer, Map<Integer, Integer>> mp = new HashMap<>();
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public DetectSquares() {
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}
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public void add(int[] point) {
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int x = point[0], y = point[1];
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if (!mp.containsKey(x)) {
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mp.put(x, new HashMap<>());
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}
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mp.get(x).put(y, mp.get(x).getOrDefault(y, 0) + 1);
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}
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public int count(int[] point) {
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int x = point[0], y = point[1];
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int ans = 0;
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if (!mp.containsKey(x)) {
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return ans;
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}
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Map<Integer, Integer> xcnt = mp.get(x);
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for (Map.Entry<Integer, Map<Integer, Integer>> e : mp.entrySet()) {
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int x1 = e.getKey();
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Map<Integer, Integer> counter = e.getValue();
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if (x1 != x) {
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int d = x1 - x;
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ans += xcnt.getOrDefault(y + d, 0) * counter.getOrDefault(y, 0) * counter.getOrDefault(y + d, 0);
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ans += xcnt.getOrDefault(y - d, 0) * counter.getOrDefault(y, 0) * counter.getOrDefault(y - d, 0);
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}
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}
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return ans;
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}
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}
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/**
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* Your DetectSquares object will be instantiated and called as such:
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* DetectSquares obj = new DetectSquares();
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* obj.add(point);
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* int param_2 = obj.count(point);
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*/
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```
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### **C++**
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```cpp
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class DetectSquares {
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public:
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unordered_map<int, unordered_map<int, int>> mp;
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DetectSquares() {
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}
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void add(vector<int> point) {
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int x = point[0], y = point[1];
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++mp[x][y];
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}
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int count(vector<int> point) {
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int x = point[0], y = point[1];
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int ans = 0;
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if (!mp.count(x)) return ans;
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auto xcnt = mp[x];
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for (auto e : mp)
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{
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int x1 = e.first;
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auto counter = e.second;
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if (x1 != x)
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{
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int d = x1 - x;
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ans += xcnt[y + d] * counter[y] * counter[y + d];
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ans += xcnt[y - d] * counter[y] * counter[y - d];
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}
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}
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return ans;
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}
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};
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/**
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* Your DetectSquares object will be instantiated and called as such:
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* DetectSquares* obj = new DetectSquares();
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* obj->add(point);
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* int param_2 = obj->count(point);
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*/
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```
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### **...**

‎solution/2000-2099/2013.Detect Squares/Solution.cpp

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,39 @@
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class DetectSquares {
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public:
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unordered_map<int, unordered_map<int, int>> mp;
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DetectSquares() {
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}
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void add(vector<int> point) {
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int x = point[0], y = point[1];
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++mp[x][y];
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}
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int count(vector<int> point) {
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int x = point[0], y = point[1];
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int ans = 0;
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if (!mp.count(x)) return ans;
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auto xcnt = mp[x];
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for (auto e : mp)
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{
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int x1 = e.first;
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auto counter = e.second;
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if (x1 != x)
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{
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int d = x1 - x;
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ans += xcnt[y + d] * counter[y] * counter[y + d];
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ans += xcnt[y - d] * counter[y] * counter[y - d];
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}
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}
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return ans;
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}
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};
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/**
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* Your DetectSquares object will be instantiated and called as such:
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* DetectSquares* obj = new DetectSquares();
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* obj->add(point);
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* int param_2 = obj->count(point);
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*/

‎solution/2000-2099/2013.Detect Squares/Solution.java

+41
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,41 @@
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class DetectSquares {
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private Map<Integer, Map<Integer, Integer>> mp = new HashMap<>();
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public DetectSquares() {
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}
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public void add(int[] point) {
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int x = point[0], y = point[1];
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if (!mp.containsKey(x)) {
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mp.put(x, new HashMap<>());
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}
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mp.get(x).put(y, mp.get(x).getOrDefault(y, 0) + 1);
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}
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public int count(int[] point) {
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int x = point[0], y = point[1];
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int ans = 0;
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if (!mp.containsKey(x)) {
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return ans;
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}
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Map<Integer, Integer> xcnt = mp.get(x);
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for (Map.Entry<Integer, Map<Integer, Integer>> e : mp.entrySet()) {
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int x1 = e.getKey();
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Map<Integer, Integer> counter = e.getValue();
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if (x1 != x) {
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int d = x1 - x;
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ans += xcnt.getOrDefault(y + d, 0) * counter.getOrDefault(y, 0) * counter.getOrDefault(y + d, 0);
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ans += xcnt.getOrDefault(y - d, 0) * counter.getOrDefault(y, 0) * counter.getOrDefault(y - d, 0);
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}
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}
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return ans;
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}
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}
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/**
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* Your DetectSquares object will be instantiated and called as such:
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* DetectSquares obj = new DetectSquares();
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* obj.add(point);
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* int param_2 = obj.count(point);
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*/

‎solution/2000-2099/2013.Detect Squares/Solution.py

+22
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,22 @@
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class DetectSquares:
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def __init__(self):
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self.mp = defaultdict(Counter)
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def add(self, point: List[int]) -> None:
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x, y = point
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self.mp[x][y] += 1
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def count(self, point: List[int]) -> int:
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x, y = point
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ans = 0
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if x not in self.mp:
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return ans
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xcnt = self.mp[x]
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for x1, counter in self.mp.items():
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if x1 != x:
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d = x1 - x
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ans += xcnt[y + d] * counter[y] * counter[y + d]
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ans += xcnt[y - d] * counter[y] * counter[y - d]
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return ans

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