Submission #491638

#	Time	Username	Problem	Language	Result	Execution time	Memory
491638		Jomnoi	Experimental Charges (NOI19_charges)	C++17	0 / 100	29 ms	2916 KiB

charges

#include <bits/stdc++.h>
#define DEBUG 0
using namespace std;
using pii = pair <int, int>;

const int N = 1e5 + 10;

int parent[N];
int dist[N];

int root(int u) {
    if(u == parent[u]) {
        return u;
    }
    int tmp = parent[u];
    parent[u] = root(parent[u]);
    dist[u] = (dist[u] + dist[tmp]) % 2;
    return parent[u];
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    int n, q;
    cin >> n >> q;
    for(int i = 1; i <= n; i++) {
        parent[i] = i;
        dist[i] = 0;
    }
    while(q--) {
        char t;
        int a, b;
        cin >> t >> a >> b;
        if(t == 'R' || t == 'A') {
            int d = (t == 'A');
            int u = root(a), v = root(b);
            if(u == v) {
                continue;
            }
            parent[u] = v;
            dist[u] = (dist[v] + 1) % 2;
        }
        else {
            if(root(a) != root(b)) {
                cout << "?\n";
                continue;
            }
            cout << (abs(dist[a] - dist[b]) % 2 ? 'R' : 'A') << '\n';
        }
    }
    return 0;
}

Compilation message (stderr)

charges.cpp: In function 'int main()':
charges.cpp:34:17: warning: unused variable 'd' [-Wunused-variable]
   34 |             int d = (t == 'A');
      |                 ^

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