Submission #585108

#	Time	Username	Problem	Language	Result	Execution time	Memory
585108		krit3379	Triangles (CEOI18_tri)	C++17	15 / 100	2 ms	724 KiB

tri

#include<bits/stdc++.h>
#include"trilib.h"
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#define N 55

int d[N][N][N],c[2];

int main(){
    int n,i,j,k,ans;
    n=get_n();
    assert(n<=50);
    for(i=1;i<=n;i++)for(j=i+1;j<=n;j++)for(k=1;k<=n;k++){
        if(k==i||k==j)continue;
        d[i][j][k]=is_clockwise(i,j,k);
    }
    for(i=1;i<=n;i++)for(j=i+1;j<=n;j++){
        c[0]=c[1]=0;
        for(k=1;k<=n;k++){
            if(k==i||k==j)continue;
            c[d[i][j][k]]++;
        }
        if(!c[0]||!c[1])ans++;
    }
    give_answer(ans);
    return 0;
}

Compilation message (stderr)

tri.cpp: In function 'int main()':
tri.cpp:26:16: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   26 |     give_answer(ans);
      |     ~~~~~~~~~~~^~~~~

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