Submission #432499

#	Time	Username	Problem	Language	Result	Execution time	Memory
432499		Nghes	Traffic (IOI10_traffic)	C++14	100 / 100	1365 ms	178480 KiB

traffic

#include "traffic.h"
#include <bits/stdc++.h>
using namespace std;
typedef int64_t ll;
#define name "main"
#define E '\n'
const int N = 1e6;
int fans;
int f[N+13];
int g[N+13];
int child[N+13];
int P[N+13];
vector<int> a[N+13];
bool maximize(int &x,int y){
    return x < y ? x =y ,1 : 0;
}
bool minimize(int &x,int y){
    return x > y ? x =y ,1 : 0;
}
void dp(int u,int p){

    for (int i=0 ; i < a[u].size(); ++i){
        int v = a[u][i];
        if (v == p) continue;
        dp(v,u);
        child[u] += child[v];
        maximize(f[u],child[v]);
    }
    child[u] += P[u];
    g[u] = fans - child[u];

}
int LocateCentre (int n, int p[], int d[], int s[])
{
    for (int i=0 ; i < n; ++i){
        fans += p[i];
        P[i+1] = p[i];
    }
    for (int i=0 ; i < n-1; ++i){
        a[s[i]+1] . push_back(d[i]+1);
        a[d[i]+1] . push_back(s[i]+1);
    }
    dp(1,1);
    int MIN = 2e9;
    int res = 0;
    for (int i=1; i <= n ; ++i)
        if (minimize(MIN,max(g[i],f[i]))) res = i;
    return res-1;
}

Compilation message (stderr)

traffic.cpp: In function 'void dp(int, int)':
traffic.cpp:22:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     for (int i=0 ; i < a[u].size(); ++i){
      |                    ~~^~~~~~~~~~~~~

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