Submission #636341

#	Time	Username	Problem	Language	Result	Execution time	Memory
636341		as111	Traffic (IOI10_traffic)	C++14	0 / 100	21 ms	47188 KiB

traffic

#include <traffic.h>
#include <vector>
#define MAXN 1000000
using namespace std;
int p[MAXN]; // parent
int pop[MAXN];
vector<int> vals[MAXN];// amt congestion for each path coming out
vector<int> adj[MAXN];
int total = 0; // total people everywhere
int ans[MAXN];
void dfs(int x, int y) {//y is back edge
	p[x] = y;
	ans[x] = pop[x];
	for (int e : adj[x]) {
		if (e == y) continue;
		dfs(e, x);
		ans[x] += ans[e];
	}
}
int LocateCentre(int N, int P[], int S[], int D[]) {
	for (int i = 0; i < N - 1; i++) {
		total += P[i];
		pop[i] = P[i];
		adj[S[i]].push_back(D[i]);
		adj[D[i]].push_back(S[i]);
	}
	total += P[N - 1];
	pop[N-1] = P[N - 1];
	dfs(0, -1);
	int mn = 2000000005;
	int ansi = 0;
	for (int i = 0; i < N; i++) {
		int mx = 0;
		for (int val : vals[i]) {
			mx = max(mx, p[i] == val ? ans[0] - ans[i] : ans[val]);
		}
		if (mx < mn) {
			mn = mx;
			ansi = i;
		}
	}
	return ansi;
}

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