Submission #979450

#	Time	Username	Problem	Language	Result	Execution time	Memory
979450		nnin	Bridges (APIO19_bridges)	C++17	13 / 100	3024 ms	4680 KiB

bridges

#include<bits/stdc++.h>
using namespace std;
#define pii pair<int,int>
#define pip pair<int,pii>
#define f first
#define s second

int n, m, q;
vector<pip> edges, query;

int dsu[50005], sz[50005];
int par(int x) {
    if(dsu[x]==x) return x;
    return dsu[x] = par(dsu[x]);
}
void init() {
    for(int i=1;i<=n;i++) {
        dsu[i] = i;
        sz[i] = 1;
    }
}
void join(int a, int b) {
    int pa = par(a);
    int pb = par(b);
    if(pa!=pb) {
        dsu[pa] = pb;
        sz[pb] += sz[pa];
    }
}

int main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    cin>>n>>m;
    for(int i=0;i<m;i++) {
        int u, v, w;
        cin>>u>>v>>w;
        edges.push_back({w, {u, v}});
    }
    cin>>q;
    for(int i=0;i<q;i++) {
        int t, x, y;
        cin>>t>>x>>y;
        query.push_back({t, {x, y}});
        if(t==1) {
            edges[x-1].f = y;
        } else {
            init();
            for(auto [w, u]:edges) {
                if(w>=y) join(u.f, u.s);
            }
            cout<<sz[par(x)]<<'\n';
        }
    }
}

• Subtask 1: 13 / 13
• Subtask 2: 0 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 14
• Subtask 5: 0 / 13
• Subtask 6: 0 / 27