Submission #376130

#	Time	Username	Problem	Language	Result	Execution time	Memory
376130		daniel920712	Designated Cities (JOI19_designated_cities)	C++14	7 / 100	634 ms	81516 KiB

designated_cities

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <vector>
#include <map>

using namespace std;
vector < pair < long long , long long > > Next[200005];
map < long long , long long > all[200005];
long long ans[200005];
void F(long long here,long long fa)
{
    for(auto i:Next[here])
    {
        if(i.first!=fa)
        {
            ans[1]+=i.second;
            F(i.first,here);
        }
    }
}
void F2(long long here,long long fa)
{
    for(auto i:Next[here])
    {
        if(i.first!=fa)
        {
            ans[i.first]=ans[here]-all[here][i.first]+all[i.first][here];
            F2(i.first,here);
        }
    }
}
int main()
{
    long long N,i,a,b,c,d,how=1e18;
    scanf("%lld",&N);
    for(i=1;i<N;i++)
    {
        scanf("%lld %lld %lld %lld",&a,&b,&c,&d);
        Next[a].push_back(make_pair(b,c));
        Next[b].push_back(make_pair(a,d));
        all[a][b]=c;
        all[b][a]=d;
    }
    F(1,-1);
    F2(1,-1);
    for(i=1;i<=N;i++)
    {
        how=min(how,ans[i]);
    }
    printf("%lld\n",how);
    return 0;
}

Compilation message (stderr)

designated_cities.cpp: In function 'int main()':
designated_cities.cpp:36:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   36 |     scanf("%lld",&N);
      |     ~~~~~^~~~~~~~~~~
designated_cities.cpp:39:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |         scanf("%lld %lld %lld %lld",&a,&b,&c,&d);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 6
• Subtask 2: 7 / 7
• Subtask 3: 0 / 9
• Subtask 4: 0 / 17
• Subtask 5: 0 / 17
• Subtask 6: 0 / 44