Submission #333221

#	Time	Username	Problem	Language	Result	Execution time	Memory
333221		daveeed	Traffic (IOI10_traffic)	C++17	100 / 100	1187 ms	178520 KiB

traffic

#include <iostream>
#include <vector>

using namespace std;

const int MAXN = 1000005;

long long sz[MAXN], ans[MAXN], tot;
vector<int> adj[MAXN];

void dfs(int i, int par){
    for(int v: adj[i]){
        if(v == par)
            continue;
        dfs(v, i);
        ans[i] = max(ans[i], sz[v]);
        sz[i] += sz[v];
    }
    ans[i] = max(ans[i], tot - sz[i]);
}

int LocateCentre(int N, int P[], int S[], int D[]){
    for(int i = 0; i < N; i++){
        sz[i] = P[i];
        tot += sz[i];
        if(i != N - 1){
            adj[S[i]].push_back(D[i]);
            adj[D[i]].push_back(S[i]);
        }
    }
    dfs(0, -1);
    int mxi = 0;
    for(int i = 1; i < N; i++){
        if(ans[i] < ans[mxi])
            mxi = i;
    }
    return mxi;
}

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