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Submission #854964

# Submission time Handle Problem Language Result Execution time Memory
854964 2023-09-29T13:00:31 Z thinknoexit Traffic (IOI10_traffic) C++17
0 / 100
 6 ms 35312 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const ll INF = 1e18;
const int N = 1001000;
ll dp[2][N];
vector<int> adj[N];
int a[N], ans = -1;
ll mn = INF;
void dfs(int v, int p = -1) {
    dp[0][v] = dp[1][v] = 0;
    for (auto& x : adj[v]) {
        if (x == p) continue;
        dfs(x, v);
        dp[0][v] += dp[0][x] + a[x];
        dp[1][v] = max(dp[1][v], dp[0][x] + a[x]);
    }
}
void dfs2(int v, int p = -1, ll w = 0) {
    if (max(w, dp[1][v]) < mn) {
        mn = max(w, dp[1][v]);
        ans = v;
    }
    for (auto& x : adj[v]) {
        if (x == p) continue;
        dfs2(x, v, dp[0][v] - dp[0][x] - a[x] + w);
    }
}
int LocateCentre(int n, int p[], int s[], int d[]) {
    for (int i = 0;i < n;i++) {
        a[i] = p[i];
    }
    for (int i = 0;i < n - 1;i++) {
        adj[s[i]].push_back(d[i]);
        adj[d[i]].push_back(s[i]);
    }
    dfs(0);
    dfs2(0);
    return ans;
}

Subtask #1
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 35164 KB Output is correct
2 Incorrect 6 ms 35312 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 35164 KB Output is correct
2 Incorrect 6 ms 35312 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 35164 KB Output is correct
2 Incorrect 6 ms 35312 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 35164 KB Output is correct
2 Incorrect 6 ms 35312 KB Output isn't correct
3 Halted 0 ms 0 KB -