Submission #1100140

#	Time	Username	Problem	Language	Result	Execution time	Memory
1100140		CpDark	Roadside Advertisements (NOI17_roadsideadverts)	C++17	30 / 100	40 ms	10204 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;
vi deg;
vi id;
vi line;
vi prefix;

int rangeSum(int s, int e) {
    if (s == 0)return prefix[e];
    return prefix[e] - prefix[s - 1];
}

void dfs(int v, int p, int counter) {
    id[v] = counter;
    for (pii curr : graph[v]) {
        int u = curr.first;
        int w = curr.second;
        if (u == p)continue;
        line.push_back(w);
        dfs(u, v, counter + 1);
    }
}

void init(int N, vector<int> V, vector<int> U, vector<int> W) {
    graph.resize(N);
    prefix.resize(N - 1);
    deg.resize(N);
    id.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] });
        deg[V[i]]++; deg[U[i]]++;
    }

    int start = 0;
    for (int i = 0;i < N;i++) {
        start = i;
        if (deg[i] == 1)break;
    }

    dfs(start, start, 0);

    for (int i = 0;i < line.size();i++) {
        if (i != 0) prefix[i] += prefix[i - 1];
        prefix[i] += line[i];
    }
}


int query(int a, int b, int c, int d, int e) {
    int left = min({ id[a],id[b],id[c],id[d], id[e] });
    int right = max({ id[a],id[b],id[c],id[d], id[e] });

    return rangeSum(left, right - 1);
}

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 'void init(int, std::vector<int>, std::vector<int>, std::vector<int>)':
roadsideadverts.cpp:50:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |     for (int i = 0;i < line.size();i++) {
      |                    ~~^~~~~~~~~~~~~

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