oj.uz

Submission #393367

# Submission time Handle Problem Language Result Execution time Memory
393367 2021-04-23T10:06:16 Z huukhang Traffic (IOI10_traffic) C++11
0 / 100
 1 ms 332 KB 
// - Only when necessary :d
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")

#include "traffic.h"
#include <bits/stdc++.h>
using namespace std;

const int inf = 2e9;

int sum = 0;
int a[1000005];
vector<vector<int>> g;
int sz[1000005], congest[1000005];

void dfs(int s, int p) {
	for (auto v : g[s]) {
		if (v != p) {
			dfs(v, s);
			sz[s] += sz[v];
			congest[s] = max(congest[s], congest[v]);
		}
	}

	congest[s] = max(congest[s], sum - sz[s] - a[s]);
	sz[s] += a[s];
}

int LocateCentre(int n, int p[], int s[], int d[]) {
	for (int i = 0; i < n; ++i) a[i] = p[i];

	g.resize(n);
	for (int i = 0; i < n - 1; ++i) {
		g[s[i]].push_back(d[i]);
		g[d[i]].push_back(s[i]);
	}

	for (int i = 0; i < n; ++i) sum += a[i];

	dfs(0, -1);

	int mn = inf, ans;
	for (int i = 0; i < n; ++i) {
		if (mn > congest[i]) {
			mn = congest[i];
			ans = i;
		}
	}

	return ans;
}

Compilation message

traffic.cpp: In function 'int LocateCentre(int, int*, int*, int*)':
traffic.cpp:50:9: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   50 |  return ans;
      |         ^~~

Subtask #1
0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -