Submission #1284927

#	Time	Username	Problem	Language	Result	Execution time	Memory
1284927		quanlm	Experimental Charges (NOI19_charges)	C++20	14 / 100	15 ms	1280 KiB

charges

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define fi first
#define se second
#define oo 1e18
#define pb push_back
#define ii pair<int, int>
#define iii pair<int, ii>
#define TASK "TEST"

int n, q;
int par[100005];

int acs(int u) {
    if (u == par[u]) return u;
    return par[u] = acs(par[u]);
}

void join(int u, int v) {
    int x = acs(u), y = acs(v);
    if (x != y) par[x] = y;
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    if (fopen(TASK".INP", "r")) {
        freopen(TASK".INP", "r", stdin);
        freopen(TASK".ANS", "w", stdout);
    }

    cin >> n >> q;

    for (int i = 1; i <= n; i++) par[i] = i;

    while (q--) {
        char type;
        cin >> type;

        if (type == 'A') {
            int a, b;
            cin >> a >> b;
        } else if (type == 'R') {
            int a, b;
            cin >> a >> b;
            join(a, b);
        } else {
            int a, b;
            cin >> a >> b;
            cout << (acs(a) == acs(b) ? 'R' : '?') << '\n';
        }

//        for (int i = 1; i <= n; i++) cout << e[i] << ' ';
//        cout << '\n';
    }
}

Compilation message (stderr)

charges.cpp: In function 'int main()':
charges.cpp:32:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen(TASK".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
charges.cpp:33:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |         freopen(TASK".ANS", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 11
• Subtask 3: 14 / 14
• Subtask 4: 0 / 12
• Subtask 5: 0 / 25
• Subtask 6: 0 / 31