Submission #164659

#TimeUsernameProblemLanguageResultExecution timeMemory
164659ahmetStar triangles (IZhO11_triangle)C++14
0 / 100
4 ms504 KiB
#include <bits/stdc++.h> using namespace std; #define ll long long #define rep(i,n) for(long long (i)=0;(i)<(n);++(i)) #define ref(i,a,b) for (long long (i)=(a); (i)<=(b); ++(i)) #define endl '\n' #define st first #define nd second #define pb push_back #define mp make_pair const long long mx=3e5+5; // FREOPEN UNUTMA long long n; pair <long long,long long> a[mx]; int main(){ ios_base::sync_with_stdio(false);cin.tie(NULL); freopen("triangles.in", "r", stdin); freopen("triangles.out", "w", stdout); // unordered_map <long long,long long> mp; unordered_map <long long,long long> mp2; cin >> n; rep(i,n){ cin >> a[i].first; cin >> a[i].second; mp.insert(pair <long long,long long>(a[i].first,a[i].nd)); mp2.insert(pair<long long,long long>(a[i].nd,a[i].st)); } long long ans=0; for(long long i=0;i<n;++i){ ans+=(mp.count(a[i].first)-1)*(mp2.count(a[i].nd)-1); // cout << mp.count(a[i].first) <<" "<< mp2.count(a[i].nd)<< endl; } cout << ans << endl; }

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:17:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  freopen("triangles.in", "r", stdin);
  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
triangle.cpp:18:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  freopen("triangles.out", "w", stdout); 
  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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