Submission #821259

#	Time	Username	Problem	Language	Result	Execution time	Memory
821259		alexander707070	Marshmallow Molecules (CCO19_day2problem2)	C++14	0 / 25	43 ms	6728 KiB

Main

#include<bits/stdc++.h>
#define MAXN 100007
using namespace std;

int n,m,a[MAXN],b[MAXN],ans,br[MAXN];
vector<int> lines[MAXN];

int main(){
    
    cin>>n>>m;
    for(int i=1;i<=m;i++){
        cin>>a[i]>>b[i];
        lines[b[i]].push_back(a[i]);
    }

    for(int i=1;i<=n;i++){
        for(int f=0;f<lines[i].size();f++){
            ans+=br[lines[i][f]];
        }
        for(int f=0;f<lines[i].size();f++){
            br[lines[i][f]]++;
        }
    }

    cout<<ans+m<<"\n";

    return 0;
}


 

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:17:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |         for(int f=0;f<lines[i].size();f++){
      |                     ~^~~~~~~~~~~~~~~~
Main.cpp:20:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |         for(int f=0;f<lines[i].size();f++){
      |                     ~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 5
• Subtask 4: 0 / 10