Submission #395346

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
395346	2021-04-28 08:48:19	KoD	Graph (BOI20_graph)	C++17	100 / 100	324 ms	20080 KiB

Graph

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#include <bits/stdc++.h>
template <class T>
using Vec = std::vector<T>;
int main() {
    int N, M;
    std::cin >> N >> M;
    Vec<int> A(M), B(M), C(M);
    Vec<Vec<std::pair<int, int>>> graph(N);
    for (int i = 0; i < M; ++i) {
        std::cin >> A[i] >> B[i] >> C[i];
        A[i] -= 1;
        B[i] -= 1;
        C[i] *= 2;
        graph[A[i]].emplace_back(B[i], C[i]);
        graph[B[i]].emplace_back(A[i], C[i]);
    }
    Vec<bool> done(N);
    Vec<std::pair<int, int>> coeff(N);
    Vec<int> val(N);
    Vec<int> visited;
    auto dfs = [&](auto&& dfs, const int u) -> void {
        done[u] = true;
        visited.push_back(u);
        for (const auto [v, c]: graph[u]) {
            if (!done[v]) {
                coeff[v].first = -coeff[u].first;
                coeff[v].second = c - coeff[u].second;
                dfs(dfs, v);
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 12 / 12
• Subtask 3: 17 / 17
• Subtask 4: 24 / 24
• Subtask 5: 42 / 42