제출 #1167434

#제출 시각아이디문제언어결과실행 시간메모리
1167434SmuggingSpunSimple game (IZhO17_game)C++20
100 / 100
33 ms5192 KiB
#include<bits/stdc++.h> #define taskname "A" using namespace std; const int LIM = 1e6 + 5; const int lim = 1e5 + 5; int n, m, h[lim], bit[LIM]; void update(int p, int x){ for(; p < LIM; p += p & -p){ bit[p] += x; } } void update(int l, int r, int x){ if(l > r){ swap(l, r); } update(l, x); update(r + 1, -x); } int get(int p){ int ans = 0; for(; p > 0; p -= p & -p){ ans += bit[p]; } return ans; } int main(){ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); if(fopen(taskname".inp", "r")){ freopen(taskname".inp", "r", stdin); } cin >> n >> m; for(int i = 1; i <= n; i++){ cin >> h[i]; } memset(bit, 0, sizeof(bit)); for(int i = 1; i < n; i++){ update(h[i], h[i + 1], 1); } for(int _ = 0; _ < m; _++){ int _t; cin >> _t; if(_t == 1){ int p, v; cin >> p >> v; if(p > 1){ update(h[p], h[p - 1], -1); update(v, h[p - 1], 1); } if(p < n){ update(h[p], h[p + 1], -1); update(v, h[p + 1], 1); } h[p] = v; } else{ int u; cin >> u; cout << get(u) << "\n"; } } }

컴파일 시 표준 에러 (stderr) 메시지

game.cpp: In function 'int main()':
game.cpp:29:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |                 freopen(taskname".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
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