Submission #1014237

#	Time	Username	Problem	Language	Result	Execution time	Memory
1014237		codexistent	Traffic (IOI10_traffic)	C++14	0 / 100	10 ms	23900 KiB

traffic

#include <iostream>
#include <vector>
#include <traffic.h>
using namespace std;
#define MAXN 1000005
#define FOR(i, a, b) for(int i = a; i <= b; i++)

int t = 0, sum[MAXN], p[MAXN];
pair<int, int> r = make_pair(-1, 2000000005);
vector<int> e[MAXN];

int dfs(int i = 0, int par = 0){
    sum[i] = p[i];
    int mx = 0;
    for(int i2 : e[i]) if(i != par){
        sum[i] += dfs(i2, i);

        mx = max(mx, sum[i2]);
    }
    mx = max(mx, t - mx - p[i]);
    if(mx < r.second){
        r.first = i;
        r.second = mx;
    }

    return sum[i];
}

int LocateCentre(int N, int P[], int S[], int D[]){
    if(N == 1) return 0;

    FOR(i, 0, N - 1) t += P[i], p[i] = P[i];
    FOR(i, 0, N - 2) {
        e[S[i]].push_back(D[i]);
        e[D[i]].push_back(S[i]);
    }
    dfs();

    return r.first;
}

• Subtask 1: 0 / 25
• Subtask 2: 0 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25