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#include <iostream> #include <vector> #include <algorithm> using namespace std; int main() { ios_base::sync_with_stdio(false); int n, x; cin >> n >> x; vector<int> niza(n); for(int i = 0; i < n; i++){ cin >> niza[i]; } sort(niza.begin(), niza.end()); // 9 // 10 // 10 - 9 int s = n; for(int i = 0; i < (int) niza.size(); i++) { int L = i + 1, R = (int) niza.size() - 1; int l = -1; while(L <= R) { int middle = (L + R) / 2; if(niza[i] + niza[middle] > x) { R = middle - 1; } else { l = max(l, middle); L = middle + 1; } } if(l != -1) { s--; niza.erase(niza.begin() + l); } } cout << s << endl; return 0; }
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