Submission #848551

#	Time	Username	Problem	Language	Result	Execution time	Memory
848551		toma_ariciu	Traffic (IOI10_traffic)	C++17	100 / 100	704 ms	167000 KiB

traffic

#include <vector>

using namespace std;

const int maxN = 1000005;
int sz[maxN], bestDiff, bestCity, total;
vector <int> G[maxN];

void dfs(int nod, int tata) {
    int currDiff = 0;
    for (int vecin : G[nod]) {
        if (vecin == tata) {
            continue;
        }
        dfs(vecin, nod);
        sz[nod] += sz[vecin];
        currDiff = max(currDiff, sz[vecin]);
    }
    currDiff = max(currDiff, total - sz[nod]);
    if (currDiff < bestDiff) {
        bestDiff = currDiff;
        bestCity = nod;
    }
}

int LocateCentre(int N, int P[], int S[], int D[]) {
    for (int i = 0; i < N; i++) {
        sz[i] += P[i];
        total += P[i];
    }
    bestDiff = 2e9 + 5;
    for (int i = 0; i < N - 1; i++) {
        G[S[i]].push_back(D[i]);
        G[D[i]].push_back(S[i]);
    }
    dfs(0, 0);
    return bestCity;
}

• Subtask 1: 25 / 25
• Subtask 2: 25 / 25
• Subtask 3: 25 / 25
• Subtask 4: 25 / 25