Submission #1220979

#	Time	Username	Problem	Language	Result	Execution time	Memory
1220979		toast12	Experimental Charges (NOI19_charges)	C11	Compilation error	0 ms	0 KiB

charges

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

struct DSU {
    vector<int> size, link, charge;
    vector<vector<int>> adj;
    DSU(int sz) {
        size.resize(sz+1, 1);
        link.resize(sz+1);
        charge.resize(sz+1, 1);
        adj.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, bool res) {
        a = find(a);
        b = find(b);
        if (a == b) return;
        if (size[a] < size[b]) swap(a, b);
        if ((charge[a] == charge[b] && res) || (charge[a] != charge[b] && !res)) {
            b = find(b);
            dfs(b, b);
        }
        size[a] += size[b];
        link[b] = a;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    void dfs(int cur, int p) {
        charge[cur] = 1-charge[cur];
        for (auto e : adj[cur]) {
            if (e != p) dfs(e, cur);
        }
    }
};

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, 0);
        else if (c == 'A') d.unite(a, b, 1);
        else {
            if (d.same(a, b)) {
                if (d.charge[a] == d.charge[b]) cout << "R\n";
                else cout << "A\n";
            }
            else cout << "?\n";
        }
    }
    return 0;
}

Compilation message (stderr)

charges.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.