CodeForce Programm Solution

OTHERS/800 Codeforces Solutions/110A_Nearly_Lucky_Number.cpp

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+//code by Nikhil Nagrale
+//nikhilnagrale2 on EveryPlatform else nknagrale
+#include<bits/stdc++.h>
+using namespace std;
+
+int main(){
+    long long n;
+    cin>>n;
+    long long count=0;
+    while(n!=0){
+        int x=n%10;
+        n/=10;
+        if(x==4 || x==7){
+            count++;
+        }
+    }
+    if(count==0) {
+        cout<<"NO"<<endl;
+        return 0;
+    }
+    bool flag=true;
+    while(count!=0){
+        int x=count%10;
+        count/=10;
+        if(x!=4 && x!=7){
+            flag=false;
+            cout<<"NO"<<endl;
+            break;
+        }
+    }
+    if(flag) cout<<"YES"<<endl;
+    return 0;
+}

OTHERS/800 Codeforces Solutions/112A_Petya_and_Strings.cpp

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+//code by Nikhil Nagrale
+//nikhilnagrale2 on EveryPlatform else nknagrale
+#include<bits/stdc++.h>
+using namespace std;
+
+int main(){
+    string a,b;
+    cin>>a>>b;
+    for(auto &c: a) c=tolower(c);
+    transform(b.begin(),b.end(),b.begin(),::tolower);
+    cout<<a.compare(b)<<endl;
+    return 0;
+}

OTHERS/800 Codeforces Solutions/116A_Tram.cpp

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+//code by Nikhil Nagrale
+//nikhilnagrale2 on EveryPlatform else nknagrale
+#include<bits/stdc++.h>
+using namespace std;
+
+int main(){
+    int n;
+    cin>>n;
+    int total=0;
+    int min=0;
+    while(n--){
+        int x;
+        cin>>x;
+        total-=x;
+        cin>>x;
+        total+=x;
+        if(total>min)
+        min=total;
+    }
+    cout<<min<<endl;
+    return 0;
+}

OTHERS/800 Codeforces Solutions/136A_Presents.cpp

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+//code by Nikhil Nagrale
+//nikhilnagrale2 on EveryPlatform else nknagrale
+#include<bits/stdc++.h>
+using namespace std;
+
+int main(){
+    int n;
+    cin>>n;
+    vector<int> v;
+    for(int i=0;i<n;i++){
+        int temp;
+        cin>>temp;
+        v.push_back(temp);  
+    }
+    int a[n];
+    int num=1;
+    for(int x:v){
+        a[x-1]=num;
+        num++;
+    }
+    for(int x:a)
+    cout<<x<<" ";
+    return 0;
+}

OTHERS/800 Codeforces Solutions/144A_Arrival_of_the_General.cpp

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+//code by Nikhil Nagrale
+//nikhilnagrale2 on EveryPlatform
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    int n;
+    cin >> n;
+    int maxindex=0;
+    int minindex=0;
+    int maxvalue=INT_MIN;
+    int minvalue=INT_MAX;
+    for (int i = 0; i < n; i++)
+    {
+        int temp;
+        cin >> temp;
+        if(temp>maxvalue){
+            maxindex=i;
+            maxvalue=temp;
+        }
+        if(temp<=minvalue){
+            minindex=i;
+            minvalue=temp;
+        }
+    }
+
+    int ans=(maxindex)+(n-minindex-1);
+    if(minindex<maxindex){
+        cout<<ans-1<<endl;;
+    }else{
+        cout<<ans<<endl;
+    }
+
+    return 0;
+}

OTHERS/800 Codeforces Solutions/148A_Insomnia_Cure.cpp

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+//code by Nikhil Nagrale
+//nikhilnagrale2 on EveryPlatform
+#include<bits/stdc++.h>
+using namespace std;
+
+int main(){
+    int a[4],d;
+    cin>>a[0]>>a[1]>>a[2]>>a[3]>>d;
+    int j;
+    set<int> s;
+    for(int i=0;i<4;i++){
+        j=1;
+        while(a[i]*j<=d){
+            if(a[i]*j<=d) s.insert(a[i]*j);
+            j++;
+        }
+    }
+    cout<<s.size()<<endl;
+    return 0;
+}

OTHERS/800 Codeforces Solutions/158A_Next_Round.cpp

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+//code by Nikhil Nagrale
+//nikhilnagrale2 on EveryPlatform else nknagrale
+#include<bits/stdc++.h>
+using namespace std;
+
+int main(){
+    int n,k;
+    cin>>n>>k;
+    vector<int> a;
+    for(int i=0;i<n;i++){
+        int temp;
+        cin>>temp;
+        a.push_back(temp);
+    }
+    int c=a[k-1];
+    int count=0;
+    for(int x:a){
+        if(x>=c && x>0) count++;
+    }
+    cout<<count<<endl;
+    return 0;
+}

OTHERS/800 Codeforces Solutions/1624A_Plus_One_On_The_Subset.cpp

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+// code by Susritha
+// cf handle:Susritha.S
+
+#include <bits/stdc++.h>
+#define ll long long int
+#define pb push_back
+#define mp make_pair
+using namespace std;
+int main(){
+ll t;
+cin>>t;
+while(t--){
+  ll n;
+  cin>>n;
+  ll a[n],i,j;
+  ll sus=0;
+  for(i=0;i<n;i++){
+      cin>>a[i];
+  }
+  for(i=0;i<n;i++){
+      while(a[i]>n){
+          a[i]/=2;
+      }
+  }
+  sort(a,a+n);
+  map<ll,ll>m;
+  for(i=0;i<n;i++){
+ if(m[a[i]]==0){
+     m[a[i]]++;
+ }
+ else{
+     while(a[i]>0){
+         if(m[a[i]]==0){
+         m[a[i]]++;
+         break;}
+         else{
+             a[i]/=2;
+         }
+
+     }
+     if(a[i]==0){
+         sus=1;
+         break;
+     }
+ }
+  }
+  for(auto it=m.begin();it!=m.end();it++){
+      if(it->second==0){
+          sus=1;
+          break;
+      }
+  }
+  if(sus==0){
+      cout<<"YES"<<endl;
+  }
+  else{
+      cout<<"NO"<<endl;
+  }
+}
+}

OTHERS/800 Codeforces Solutions/200B_Drinks.cpp

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+//code by Nikhil Nagrale
+//nikhilnagrale2 on EveryPlatform
+#include<bits/stdc++.h>
+using namespace std;
+
+int main(){
+    int n;
+    cin>>n;
+    double a[n];
+    double ans=0;
+    for(int i=0;i<n;i++){
+        cin>>a[i];
+        ans+=a[i];
+    }
+    cout<<ans/n<<endl;
+
+    return 0;
+}

OTHERS/800 Codeforces Solutions/228A_Is_your_horseshoe_on_the_other_hoof.cpp

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+//code by Nikhil Nagrale
+//nikhilnagrale2 on EveryPlatform
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    set<long long> s;
+    int temp;
+    int t = 4;
+    while (t--)
+    {
+        cin >> temp;
+        s.insert(temp);
+    }
+    cout<<4-s.size()<<endl;
+    return 0;
+}

OTHERS/800 Codeforces Solutions/231A_Team.cpp

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+//code by Nikhil Nagrale
+//nikhilnagrale2 on EveryPlatform else nknagrale
+#include<bits/stdc++.h>
+using namespace std;
+
+int main(){
+    int n;
+    cin>>n;
+    int count=0;
+    while(n--){
+        int x,y,z;
+        cin>>x>>y>>z;
+        if((x+y+z)>=2) count++;
+    }
+    cout<<count<<endl;
+    return 0;
+}

OTHERS/800 Codeforces Solutions/236A_Boy_or_Girl.cpp

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+//code by Nikhil Nagrale
+//nikhilnagrale2 on EveryPlatform else nknagrale
+#include<bits/stdc++.h>
+using namespace std;
+
+int main(){
+    string s;
+    cin>>s;
+    set<char> a;
+    for(char x:s) a.insert(x);
+    if(a.size()%2==0) cout<<"CHAT WITH HER!"<<endl;
+    else cout<<"IGNORE HIM!"<<endl;
+    return 0;
+}

OTHERS/800 Codeforces Solutions/262A_Roma_LuckyNumbers.cpp

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+// Problem: A. Roma and Lucky Numbers
+// Contest: Codeforces - Codeforces Round #160 (Div. 2)
+// URL: https://codeforces.com/contest/262/problem/A
+// Memory Limit: 256 MB
+// Time Limit: 1000 ms
+// 
+// Powered by CP Editor (https://cpeditor.org)
+
+#include<bits/stdc++.h>
+using namespace std;
+#define ll long long
+#define FAST1 ios_base::sync_with_stdio(false);
+#define FAST2 cin.tie(NULL);
+int n, k, ans, num;
+	string s;
+int main(){
+    FAST1;
+    FAST2;
+
+	cin >> n >> k;
+	for (int i = 0; i < n; i++){
+		cin >> s;
+		for (int j = 0; j < s.size(); j++){
+			if (s[j] == '7' || s[j] == '4'){
+				num ++;
+			}
+		}
+		if (num <= k){
+			ans++;
+		}
+		num = 0;
+	}
+	cout << ans << endl;
+	return 0;
+
+}

OTHERS/800 Codeforces Solutions/262B_Roma_and_Changing_Signs.cpp

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+// Problem: B. Roma and Changing Signs
+// Contest: Codeforces - Codeforces Round #160 (Div. 2)
+// URL: https://codeforces.com/contest/262/problem/B
+// Memory Limit: 256 MB
+// Time Limit: 2000 ms
+// 
+// Powered by CP Editor (https://cpeditor.org)
+
+#include<bits/stdc++.h>
+using namespace std;
+#define ll long long
+#define FAST1 ios_base::sync_with_stdio(false);
+#define FAST2 cin.tie(NULL);
+
+
+int main(){
+    FAST1;
+    FAST2;
+    int n;int k;
+    cin>>n>>k;
+    int arr[n];
+    for(int i=0;i<n;i++)
+    	cin>>arr[i];
+
+    int mn =INT_MAX;
+    int sm=0; 
+    for(int i=0;i<n;i++)
+    {
+    	mn = min(abs(arr[i]),mn);
+    	if(arr[i]<0 && k>0)
+    		arr[i] *= -1,k--;
+    	sm+=arr[i];	
+    }
+    if(k>0 && k%2==1)
+    	sm -= 2 * mn;
+
+    cout<<sm;
+    return 0;
+}