Submission #425040

#	Time	Username	Problem	Language	Result	Execution time	Memory
425040		A_D	Triangles (CEOI18_tri)	C++14	35 / 100	401 ms	284 KiB

tri

#include <bits/stdc++.h>
#include "trilib.h"
using namespace std;
int nn;
bool ok(int i,int j)
{
    int cnt=0;
    for(int k=1;k<=nn;k++){
        if(k==i||k==j)continue;
        int b=is_clockwise(i,j,k);
        cnt|=(1<<b);
    }
    return cnt<3;
}
void solve()
{
    nn=get_n();
    int ans=0;
    for(int i=1;i<=nn;i++){
        for(int j=i+1;j<=nn;j++){
            if(i==j)continue;
            if(ok(i,j))ans+=1;
        }
    }
    give_answer(ans);
}
main()
{
    int t=1;
    while(t--)solve();
    //cin>>t;
}

Compilation message (stderr)

tri.cpp:27:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   27 | main()
      | ^~~~

• Subtask 1: 15 / 15
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 20 / 20
• Subtask 5: 0 / 25