Submission #1100142

#	Time	Username	Problem	Language	Result	Execution time	Memory
1100142		CpDark	Roadside Advertisements (NOI17_roadsideadverts)	C++17	47 / 100	1046 ms	7292 KiB

roadsideadverts

#include<bits/stdc++.h>
using namespace std;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> pii;
typedef vector<pii> vp;
typedef vector<vp> vvp;

vvp graph;
vp par;



void dfs(int v, int p, int w) {
    par[v] = { p, w };
    for (pii curr : graph[v]) {
        int u = curr.first;
        int w = curr.second;
        if (u != p)dfs(u, v, w);
    }
}

void init(int N, vector<int> V, vector<int> U, vector<int> W) {
    graph.resize(N);
    par.resize(N);
    for (int i = 0;i < N - 1;i++) {
        graph[V[i]].push_back({ U[i],W[i] });
        graph[U[i]].push_back({ V[i],W[i] });
    }
}


int query(int a, int b, int c, int d, int e) {
    vi nodes = { a,b,c,d,e };
    vector<bool> visited(graph.size());
    dfs(a, a, 0);
    int ans = 0;

    for (int i = 1;i < nodes.size();i++) {
        int v = nodes[i];
        while (!visited[v]) {
            visited[v] = true;
            ans += par[v].second;
            v = par[v].first;
        }
    }
    return ans;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int N, Q;
    cin >> N;

    vi V(N - 1), U(N - 1), W(N - 1);
    for (int i = 0;i < N - 1;i++)cin >> V[i] >> U[i] >> W[i];
    
    init(N, V, U, W);

    cin >> Q;
    for (int i = 0;i < Q;i++) {
        int a, b, c, d, e;
        cin >> a >> b >> c >> d >> e;
        cout << query(a, b, c, d, e) << endl;
    }
    return 0;
}

Compilation message (stderr)

roadsideadverts.cpp: In function 'int query(int, int, int, int, int)':
roadsideadverts.cpp:39:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     for (int i = 1;i < nodes.size();i++) {
      |                    ~~^~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 0 / 23
• Subtask 3: 40 / 40
• Subtask 4: 0 / 30