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Submission #347930

# Submission time Handle Problem Language Result Execution time Memory
347930 2021-01-13T19:52:32 Z training4usaco Traffic (IOI10_traffic) C++11
0 / 100
 2 ms 492 KB 
#include "traffic.h"
#include <climits>
#include <iostream>
#include <vector>
using namespace std;

int n;
vector<int> p;

vector<vector<int>> adj;
vector<int> traffic;
vector<int> children;

int numFans = 0;

void dfs (int idx, int par) {
    for (int i = 0; i < adj[idx].size(); ++i) {

        if (adj[idx][i] == par) {
            continue;
        }

        dfs(adj[idx][i], idx);
        children[idx] += children[adj[idx][i]];
        traffic[idx] = max(traffic[idx], children[adj[idx][i]]);
    }

    traffic[idx] = max(traffic[idx], numFans - children[idx] - p[idx]);

    children[idx] += p[idx];
}

int LocateCentre (int ni, int pi[], int d[], int s[]) {
    n = ni;

    for(int i = 0; i < n; ++i) {
        p[i] = pi[i];
    }

    adj = vector<vector<int>>(n);
    traffic = vector<int>(n);
    children = vector<int>(n);

    for (int i = 0; i < n; i++) {
        numFans += 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, -1);

    int best = INT_MAX;
    int ans = -1;

    for (int i = 0; i < n; i++) {
        if (traffic[i] < best) {
            ans = i;
            best = traffic[i];
        }
    }

    return ans;
}

Compilation message

traffic.cpp: In function 'void dfs(int, int)':
traffic.cpp:17:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     for (int i = 0; i < adj[idx].size(); ++i) {
      |                     ~~^~~~~~~~~~~~~~~~~

Subtask #1
0 / 25.0

# Verdict Execution time Memory Grader output
1 Runtime error 2 ms 492 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Runtime error 2 ms 492 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Runtime error 2 ms 492 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #4
0 / 25.0

# Verdict Execution time Memory Grader output
1 Runtime error 2 ms 492 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -