Submission #573504

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
#define mp make_pair
#define f first
#define s second

map<pair<int, int>, int> m;

int n;
int ans[4];
pair<int, int> p[1111];

int main()
{
  cin >> n;
  for(int i = 1; i <= n; i++)
  {
    scanf("%d%d", &p[i].f, &p[i].s);
    m[p[i]] = i;
  }

  int flag = 0;
  for(int i = 1; i = n; i++)
  {
    for(int j = 1; j <= n; j++)
    {
      if(i == j) continue;
      pair<int, int> vec1 = mp(p[j].f - p[i].f, p[j].s - p[i].s), vec2 = mp(p[i].f - p[j].f, p[i].s - p[j].s);
      if(m[mp(p[i].f - vec1.s, p[i].s + vec1.f)] && m[mp(p[j].f + vec2.s, p[j].s - vec2.f)])
      {
        ans[0] = m[mp(p[i].f - vec1.s, p[i].s + vec1.f)];
        ans[1] = m[mp(p[j].f + vec2.s, p[j].s - vec2.f)];
        ans[2] = i, ans[3] = j;
        sort(ans, ans + 4);
        printf("4\n");
        for(int k = 0; k < 4; k++) printf("%d\n", ans[k]);
        flag = 1;
      }
      if(flag) break;
      if(m[mp(p[j].f - vec1.s, p[j].s + vec1.f)] && m[mp(p[i].f + vec2.s, p[i].s - vec2.f)])
      {
        ans[0] = m[mp(p[j].f - vec1.s, p[j].s + vec1.f)];
        ans[1] = m[mp(p[i].f + vec2.s, p[i].s - vec2.f)];
        ans[2] = i, ans[3] = j;
        sort(ans, ans + 4);
        printf("4\n");
        for(int k = 0; k < 4; k++) printf("%d\n", ans[k]);
        flag = 1;
      }
      if(flag) break;
    }
    if(flag) break;
  }
  if(!flag) puts("0");
  
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:18:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]

Judge Result