Why i am getting fatal error.
#include<bits/stdc++.h>using namespace std;vector<int>v[1005];int i,n;int a[1005];bool vis[1005];int count1=0;void per(int j){v[count1].push_back(j);vis[j]=true;if(!vis[a[j]]){per(a[j]);}}int main(){cin>>n;for(i=1;i<=n;i++)cin>>a[i];
#include<bits/stdc++.h>using namespace std;vector<int >ast[100001];long long sum=0,count1=0,count2=0;int astvst[100001];void dfs(int k){astvst[k]=1;count1++;count2++;for(int i=0;i<ast[k].size();i++){if(astvst[ast[k][i]]==0)dfs(ast[k][i]);}}int main(){ios::sync_with_stdio(false);int n,p;cin>>n>>p;for(int i=0;i< p;i++){int a,b;
Notes: This problem needs input-output optimization to run in time. If you are using C++ and you use cin to get your input, add these two lines to the beginning of the main function. You don't need to do anything if you use scanf.
ios_base::sync_with_stdio(false);
#include<bits/stdc++.h>using namespace std;int main(){ios_base::sync_with_stdio(false);cin.tie(NULL);int n;cin>>n;int a[n],j=0,b,c;for(int i=1;i<=n;i++){cin>>b>>c;a[j]=min(b,c);j++;}sort(a,a+n);int count=1;for(int i=1;i<n;i++){if(a[i]>=count+1)count++;}cout<<count;return 0;
Zonal Computing Olympiad is round 1 out of 3 (i.e. beginner) for selection into Indian IOI team.
#include<bits/stdc++.h>using namespace std;int main(){int n;cin>>n;int a[n];for(int i=0;i<n;i++)cin>>a[i];int max=0,pos=0,count1=0,maxcount=0,pos1,pos2,max1=0;for(int i=0;i<n;i++){if(count1==0){maxcount=0;pos1=i+1;}if(a[i]==1){count1++;if(max<count1){max=count1;pos=i+1;
