Submission #947464

#	Time	Username	Problem	Language	Result	Execution time	Memory
947464		vjudge306	Star triangles (IZhO11_triangle)	C++14	100 / 100	509 ms	33528 KiB

triangle

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ordered_set tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update>
#define nn "\n"
#define x_x ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define intt int _; cin >> _; while (_--)
#define emp push_back
#define mod 1000000007
#define all(v) v.begin(), v.end()
#define ld long double
#define A first
#define B second
typedef long long ll;
const ld eps = 1e-27;
// diff between decimals 0.000000001 mt19937 mt(time(nullptr));

int main() {

    x_x
int n; cin>>n; vector<pair<int,int>>ar;
map<pair<int,int>,int>mp; map<int,ll>r,c;
for(int i=0,x,y; i<n; i++) {
 cin>>x>>y; if (mp.find({x,y})==mp.end()) {mp[{x,y}]=1, r[x]++, c[y]++;
ar.emp({x,y});}
}
ll ans=0;
for(int i=0; i<ar.size(); i++) {
ans+=((r[ar[i].A]-1)*(c[ar[i].B]-1));
}
cout<<ans;
    return 0;
}

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:30:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 | for(int i=0; i<ar.size(); i++) {
      |              ~^~~~~~~~~~

• Subtask 1: 100 / 100