Submission #733010

#	Time	Username	Problem	Language	Result	Execution time	Memory
733010		nguyentunglam	Inside information (BOI21_servers)	C++17	5 / 100	2071 ms	64948 KiB

servers

#include<bits/stdc++.h>
#define fi first
#define se second
#define endl "\n"
#define ii pair<int, int>
using namespace std;
const int N = 4010;
int f[N][N];
int main() {
    #define task ""
    cin.tie(0) -> sync_with_stdio(0);
    if (fopen ("task.inp", "r")) {
        freopen ("task.inp", "r", stdin);
        freopen ("task.ans", "w", stdout);
    }
    if (fopen (task".inp", "r")) {
        freopen (task".inp", "r", stdin);
        freopen (task".out", "w", stdout);
    }
    int n, k; cin >> n >> k;
    k = k + n - 1;
    for(int i = 1; i <= n; i++) f[i][i] = 1;
    while (k--) {
        char c; cin >> c;
        if (c == 'S') {
            int x, y; cin >> x >> y;
            for(int i = 1; i <= n; i++) f[x][i] = f[y][i] = f[x][i] | f[y][i];
        }
        if (c == 'Q') {
            int x, y; cin >> x >> y;
            cout << (f[x][y] ? "yes\n" : "no\n");
        }
        if (c == 'C') {
            int x; cin >> x;
            int ans = 0;
            for(int i = 1; i <= n; i++) ans += f[i][x];
            cout << ans << endl;
        }
    }

}

Compilation message (stderr)

servers.cpp: In function 'int main()':
servers.cpp:13:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |         freopen ("task.inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
servers.cpp:14:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |         freopen ("task.ans", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
servers.cpp:17:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         freopen (task".inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
servers.cpp:18:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |         freopen (task".out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 2.5 / 2.5
• Subtask 2: 2.5 / 2.5
• Subtask 3: 0 / 2.5
• Subtask 4: 0 / 2.5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 5
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 12.5
• Subtask 10: 0 / 12.5
• Subtask 11: 0 / 17.5
• Subtask 12: 0 / 17.5