Bình luận

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  ChungZhong  đã bình luận lúc 27, Tháng 5, 2026, 9:54

  include <bits/stdc++.h>

  using namespace std;

  vector<int> dayso;

  int main() { iosbase::syncwithstdio(false); cin.tie(NULL); freopen("TAMGIAC.INP","r",stdin); freopen("TAMGIAC.OUT","w",stdout); int n ; cin>>n ; for(int i = 0; i<n ; i++){ int temp; cin>>temp; dayso.pushback(temp); } sort(dayso.begin(), dayso.end()); int dem = 0; for(int i = 0; i<n ; i++){ for(int j = i+1 ; j< n; j++){ auto lon = lower_bound(dayso.begin(), dayso.end(),dayso[j] + dayso[i]); int pos = lon - dayso.begin() ; dem += pos - j - 1; } } cout<<dem; return 0; }