Submission #561661

#	Time	Username	Problem	Language	Result	Execution time	Memory
561661		KiriLL1ca	Star triangles (IZhO11_triangle)	C++14	100 / 100	300 ms	13280 KiB

triangle

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define fr first
#define sc second
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define pw(x) (1ll << x)
#define sz(x) (int)((x).size())
#define pb push_back
#define endl '\n'
#define vec vector

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef pair <int, int> pii;

template <typename T> inline bool umin (T &a, const T &b) { if (a > b) { a = b; return 1; } return 0; }
template <typename T> inline bool umax (T &a, const T &b) { if (a < b) { a = b; return 1; } return 0; }

template <typename T>
using oset = tree<T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;

inline void solve () {
      int n; cin >> n;
      vector <pii> a (n);
      map <int, ll> cntX, cntY;
      for (auto &[x, y] : a) cin >> x >> y, ++cntX[x], ++cntY[y];
      ll ans = 0;
      for (auto &[x, y] : a) ans += (cntX[x] - 1) * (cntY[y] - 1);
      cout << ans << endl;
}

signed main() {
      ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
      int t = 1; //cin >> t;
      while (t--) solve();
      return 0;
}

Compilation message (stderr)

triangle.cpp: In function 'void solve()':
triangle.cpp:31:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   31 |       for (auto &[x, y] : a) cin >> x >> y, ++cntX[x], ++cntY[y];
      |                  ^
triangle.cpp:33:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   33 |       for (auto &[x, y] : a) ans += (cntX[x] - 1) * (cntY[y] - 1);
      |                  ^

• Subtask 1: 100 / 100