Submission #1108307

#	Time	Username	Problem	Language	Result	Execution time	Memory
1108307		toast12	Experimental Charges (NOI19_charges)	C++14	18 / 100	1063 ms	2640 KiB

charges

#include <bits/stdc++.h>
using namespace std;

struct DSU {
    vector<int> size, link;
    vector<bool> added;
    DSU(int sz) {
        size.resize(sz+1);
        link.resize(sz+1);
        added.resize(sz+1);
        iota(link.begin(), link.end(), 0);
    }
    int find(int x) {
        while (x != link[x]) x = link[x];
        return x;
    }
    bool same(int a, int b) {
        return find(a) == find(b);
    }
    void unite(int a, int b) {
        added[a] = true, added[b] = true;
        a = find(a);
        b = find(b);
        if (a == b) return;
        if (size[a] < size[b]) swap(a, b);
        size[a] += size[b];
        link[b] = a;
    }
};

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    int n, q;
    cin >> n >> q;
    DSU d(n);
    while (q--) {
        char c;
        int a, b;
        cin >> c >> a >> b;
        if (c == 'R') d.unite(a, b);
        else if (c == 'A') d.added[a] = true, d.added[b] = true;
        else if (c == 'Q') {
            if (d.same(a, b)) cout << "R\n";
            else if (d.added[a] && d.added[b]) cout << "A\n";
            else cout << "?\n";
        }
    }
    return 0;
}

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