Submission #477236

#	Time	Username	Problem	Language	Result	Execution time	Memory
477236		wiktoria_bazan	Pipes (BOI13_pipes)	C++14	35 / 100	200 ms	34968 KiB

pipes

#include <iostream>
#include <vector>
#include <map>
using namespace std;

typedef long long ll;
ll const N = 1e5 + 9;
ll C[N], C2[N], X[N];
bool odw[N];
vector<ll> G[N];
bool t = true;
map<pair<ll, ll>, ll> M;
pair<ll, ll> T[N];

void dfs(ll v) {
    odw[v] = 1;
    bool k = true;
    for (ll i = 0; i < G[v].size(); i++) {
        ll syn = G[v][i];
        if (odw[syn] == 0) {
          dfs(syn);
          C2[v] += C[syn];
          M[{v, syn}] = C[syn] * 2;
          M[{syn, v}] = C[syn] * 2;
          k = false;
        }
    }
    if (k == true) C2[v] = C[v];
}

void task1(ll n, ll m) {
    dfs(1);
    for (ll i = 0; i < n; i++) {
        if (C[i] != C2[i]) {
            cout << "0\n";
            return;
        }
    }
    for (ll i = 0; i < m; i++) {
        cout << M[T[i]] << "\n";
    }
    return;
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    ll n, m;
    cin >> n >> m;
    for (ll i = 1; i <= n; i++)
        cin >> C[i];
    for (ll i = 0; i < m; i++) {
        ll a, b;
        cin >> a >> b;
        G[a].push_back(b);
        G[b].push_back(a);
        T[i] = { a, b };
    }
    task1(n, m); //podzadanie za 30
}

Compilation message (stderr)

pipes.cpp: In function 'void dfs(ll)':
pipes.cpp:18:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |     for (ll i = 0; i < G[v].size(); i++) {
      |                    ~~^~~~~~~~~~~~~

• Subtask 1: 0 / 30
• Subtask 2: 35 / 70