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58 | 58 |
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59 | 59 | <!-- 这里可写通用的实现逻辑 -->
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60 | 60 |
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| 61 | +**方法一:二维前缀和 + 二维差分** |
| 62 | + |
61 | 63 | <!-- tabs:start -->
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62 | 64 |
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63 | 65 | ### **Python3**
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64 | 66 |
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65 | 67 | <!-- 这里可写当前语言的特殊实现逻辑 -->
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66 | 68 |
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67 | 69 | ```python
|
68 |
| - |
| 70 | +class Solution: |
| 71 | + def possibleToStamp(self, grid: List[List[int]], stampHeight: int, stampWidth: int) -> bool: |
| 72 | + m, n = len(grid), len(grid[0]) |
| 73 | + s = [[0] * (n + 1) for _ in range(m + 1)] |
| 74 | + for i, row in enumerate(grid): |
| 75 | + for j, v in enumerate(row): |
| 76 | + s[i + 1][j + 1] = s[i + 1][j] + s[i][j + 1] - s[i][j] + v |
| 77 | + |
| 78 | + d = [[0] * (n + 1) for _ in range(m + 1)] |
| 79 | + for i, row in enumerate(grid): |
| 80 | + for j, v in enumerate(row): |
| 81 | + if v == 0: |
| 82 | + x, y = i + stampHeight, j + stampWidth |
| 83 | + if x <= m and y <= n and s[x][y] - s[x][j] - s[i][y] + s[i][j] == 0: |
| 84 | + d[i][j] += 1 |
| 85 | + d[i][y] -= 1 |
| 86 | + d[x][j] -= 1 |
| 87 | + d[x][y] += 1 |
| 88 | + |
| 89 | + cnt = [[0] * (n + 1) for _ in range(m + 1)] |
| 90 | + for i, row in enumerate(grid): |
| 91 | + for j, v in enumerate(row): |
| 92 | + cnt[i + 1][j + 1] = cnt[i + 1][j] + cnt[i][j + 1] - cnt[i][j] + d[i][j] |
| 93 | + if v == 0 and cnt[i + 1][j + 1] == 0: |
| 94 | + return False |
| 95 | + return True |
69 | 96 | ```
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70 | 97 |
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71 | 98 | ### **Java**
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72 | 99 |
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73 | 100 | <!-- 这里可写当前语言的特殊实现逻辑 -->
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74 | 101 |
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75 | 102 | ```java
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| 103 | +class Solution { |
| 104 | + public boolean possibleToStamp(int[][] grid, int stampHeight, int stampWidth) { |
| 105 | + int m = grid.length, n = grid[0].length; |
| 106 | + int[][] s = new int[m + 1][n + 1]; |
| 107 | + for (int i = 0; i < m; ++i) { |
| 108 | + for (int j = 0; j < n; ++j) { |
| 109 | + s[i + 1][j + 1] = s[i + 1][j] + s[i][j + 1] - s[i][j] + grid[i][j]; |
| 110 | + } |
| 111 | + } |
| 112 | + int[][] d = new int[m + 1][n + 1]; |
| 113 | + for (int i = 0; i < m; ++i) { |
| 114 | + for (int j = 0; j < n; ++j) { |
| 115 | + if (grid[i][j] == 0) { |
| 116 | + int x = i + stampHeight, y = j + stampWidth; |
| 117 | + if (x <= m && y <= n && s[x][y] - s[x][j] - s[i][y] + s[i][j] == 0) { |
| 118 | + d[i][j]++; |
| 119 | + d[i][y]--; |
| 120 | + d[x][j]--; |
| 121 | + d[x][y]++; |
| 122 | + } |
| 123 | + } |
| 124 | + } |
| 125 | + } |
| 126 | + int[][] cnt = new int[m + 1][n + 1]; |
| 127 | + for (int i = 0; i < m; ++i) { |
| 128 | + for (int j = 0; j < n; ++j) { |
| 129 | + cnt[i + 1][j + 1] = cnt[i + 1][j] + cnt[i][j + 1] - cnt[i][j] + d[i][j]; |
| 130 | + if (grid[i][j] == 0 && cnt[i + 1][j + 1] == 0) { |
| 131 | + return false; |
| 132 | + } |
| 133 | + } |
| 134 | + } |
| 135 | + return true; |
| 136 | + } |
| 137 | +} |
| 138 | +``` |
| 139 | + |
| 140 | +### **C++** |
| 141 | + |
| 142 | +```cpp |
| 143 | +class Solution { |
| 144 | +public: |
| 145 | + bool possibleToStamp(vector<vector<int>>& grid, int stampHeight, int stampWidth) { |
| 146 | + int m = grid.size(), n = grid[0].size(); |
| 147 | + vector<vector<int>> s(m + 1, vector<int>(n + 1)); |
| 148 | + for (int i = 0; i < m; ++i) |
| 149 | + { |
| 150 | + for (int j = 0; j < n; ++j) |
| 151 | + { |
| 152 | + s[i + 1][j + 1] = s[i + 1][j] + s[i][j + 1] - s[i][j] + grid[i][j]; |
| 153 | + } |
| 154 | + } |
| 155 | + vector<vector<int>> d(m + 1, vector<int>(n + 1)); |
| 156 | + for (int i = 0; i < m; ++i) |
| 157 | + { |
| 158 | + for (int j = 0; j < n; ++j) |
| 159 | + { |
| 160 | + if (grid[i][j]) continue; |
| 161 | + int x = i + stampHeight, y = j + stampWidth; |
| 162 | + if (x <= m && y <= n && s[x][y] - s[i][y] - s[x][j] + s[i][j] == 0) |
| 163 | + { |
| 164 | + d[i][j]++; |
| 165 | + d[x][j]--; |
| 166 | + d[i][y]--; |
| 167 | + d[x][y]++; |
| 168 | + } |
| 169 | + } |
| 170 | + } |
| 171 | + vector<vector<int>> cnt(m + 1, vector<int>(n + 1)); |
| 172 | + for (int i = 0; i < m; ++i) |
| 173 | + { |
| 174 | + for (int j = 0; j < n; ++j) |
| 175 | + { |
| 176 | + cnt[i + 1][j + 1] = cnt[i + 1][j] + cnt[i][j + 1] - cnt[i][j] + d[i][j]; |
| 177 | + if (grid[i][j] == 0 && cnt[i + 1][j + 1] == 0) return false; |
| 178 | + } |
| 179 | + } |
| 180 | + return true; |
| 181 | + } |
| 182 | +}; |
| 183 | +``` |
| 184 | +
|
| 185 | +### **Go** |
| 186 | +
|
| 187 | +```go |
| 188 | +func possibleToStamp(grid [][]int, stampHeight int, stampWidth int) bool { |
| 189 | + m, n := len(grid), len(grid[0]) |
| 190 | + s := make([][]int, m+1) |
| 191 | + d := make([][]int, m+1) |
| 192 | + cnt := make([][]int, m+1) |
| 193 | + for i := range s { |
| 194 | + s[i] = make([]int, n+1) |
| 195 | + d[i] = make([]int, n+1) |
| 196 | + cnt[i] = make([]int, n+1) |
| 197 | + } |
| 198 | + for i, row := range grid { |
| 199 | + for j, v := range row { |
| 200 | + s[i+1][j+1] = s[i+1][j] + s[i][j+1] - s[i][j] + v |
| 201 | + } |
| 202 | + } |
| 203 | + for i, row := range grid { |
| 204 | + for j, v := range row { |
| 205 | + if v == 0 { |
| 206 | + x, y := i+stampHeight, j+stampWidth |
| 207 | + if x <= m && y <= n && s[x][y]-s[i][y]-s[x][j]+s[i][j] == 0 { |
| 208 | + d[i][j]++ |
| 209 | + d[i][y]-- |
| 210 | + d[x][j]-- |
| 211 | + d[x][y]++ |
| 212 | + } |
| 213 | + } |
| 214 | + } |
| 215 | + } |
| 216 | + for i, row := range grid { |
| 217 | + for j, v := range row { |
| 218 | + cnt[i+1][j+1] = cnt[i+1][j] + cnt[i][j+1] - cnt[i][j] + d[i][j] |
| 219 | + if v == 0 && cnt[i+1][j+1] == 0 { |
| 220 | + return false |
| 221 | + } |
| 222 | + } |
| 223 | + } |
| 224 | + return true |
| 225 | +} |
| 226 | +``` |
76 | 227 |
|
| 228 | +### **JavaScript** |
| 229 | + |
| 230 | +```js |
| 231 | +/** |
| 232 | + * @param {number[][]} grid |
| 233 | + * @param {number} stampHeight |
| 234 | + * @param {number} stampWidth |
| 235 | + * @return {boolean} |
| 236 | + */ |
| 237 | +var possibleToStamp = function (grid, stampHeight, stampWidth) { |
| 238 | + const m = grid.length; |
| 239 | + const n = grid[0].length; |
| 240 | + let s = new Array(m + 1).fill(0).map(() => new Array(n + 1).fill(0)); |
| 241 | + let d = new Array(m + 1).fill(0).map(() => new Array(n + 1).fill(0)); |
| 242 | + let cnt = new Array(m + 1).fill(0).map(() => new Array(n + 1).fill(0)); |
| 243 | + for (let i = 0; i < m; ++i) { |
| 244 | + for (let j = 0; j < n; ++j) { |
| 245 | + s[i + 1][j + 1] = s[i + 1][j] + s[i][j + 1] - s[i][j] + grid[i][j]; |
| 246 | + } |
| 247 | + } |
| 248 | + for (let i = 0; i < m; ++i) { |
| 249 | + for (let j = 0; j < n; ++j) { |
| 250 | + if (grid[i][j] == 0) { |
| 251 | + let [x, y] = [i + stampHeight, j + stampWidth]; |
| 252 | + if ( |
| 253 | + x <= m && |
| 254 | + y <= n && |
| 255 | + s[x][y] - s[i][y] - s[x][j] + s[i][j] == 0 |
| 256 | + ) { |
| 257 | + d[i][j]++; |
| 258 | + d[i][y]--; |
| 259 | + d[x][j]--; |
| 260 | + d[x][y]++; |
| 261 | + } |
| 262 | + } |
| 263 | + } |
| 264 | + } |
| 265 | + for (let i = 0; i < m; ++i) { |
| 266 | + for (let j = 0; j < n; ++j) { |
| 267 | + cnt[i + 1][j + 1] = |
| 268 | + cnt[i + 1][j] + cnt[i][j + 1] - cnt[i][j] + d[i][j]; |
| 269 | + if (grid[i][j] == 0 && cnt[i + 1][j + 1] == 0) { |
| 270 | + return false; |
| 271 | + } |
| 272 | + } |
| 273 | + } |
| 274 | + return true; |
| 275 | +}; |
77 | 276 | ```
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78 | 277 |
|
79 | 278 | ### **TypeScript**
|
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