Submission #378081

#	Time	Username	Problem	Language	Result	Execution time	Memory
378081		daniel920712	Designated Cities (JOI19_designated_cities)	C++14	13 / 100	670 ms	92268 KiB

designated_cities

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

using namespace std;
vector < pair < long long , long long > > Next[200005];
map < long long , long long > all[200005];
set < long long > vis[200005];
long long ans[200005];
long long xx[200005];
long long how[200005];
long long N=0;
pair < long long , long long > A,B;
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);
        }
    }
}
void F3(long long here,long long fa)
{
    for(auto i:Next[here])
    {
        if(i.first!=fa)
        {
            vis[here].insert(i.first);
            F3(i.first,here);
        }
    }
}
pair < long long , long long > F4(long long here,long long fa,long long con)
{
    pair < long long , long long > a=make_pair(con,here),b=make_pair(0,here),tt;
    for(auto i:Next[here])
    {
        if(i.first!=fa)
        {
            tt=F4(i.first,here,con+i.second);
            if(tt>a)
            {
                b=a;
                a=tt;
            }
            else if(tt>b)
            {
                b=tt;
            }
        }
    }
    A=a;
    B=b;
    return a;
}
int main()
{
    long long M,i,j,k,a,b,c,d,where;
    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;
    }
    for(i=1;i<=N;i++) xx[i]=1e18;
    if(N<=16)
    {
        for(i=0;i<(1<<N);i++)
        {
            a=0;
            b=0;
            for(j=1;j<=N;j++) vis[j].clear();
            for(j=0;j<N;j++)
            {
                if(i&(1<<j))
                {
                    F3(j+1,-1);
                    a++;
                }
            }
            for(j=1;j<=N;j++) for(auto k:Next[j]) if(vis[j].find(k.first)==vis[j].end()) b+=all[k.first][j];
            xx[a]=min(xx[a],b);
        }
        scanf("%lld",&M);
        while(M--)
        {
            scanf("%lld",&a);
            printf("%lld\n",xx[a]);
        }
    }
    else
    {
        F(1,-1);
        F2(1,-1);
        how[1]=1e18;
        for(i=1;i<=N;i++)
        {
            how[1]=min(how[1],ans[i]);
            if(how[1]==ans[i]) where=i;
        }
        F4(where,-1,0);
        how[2]=how[1]-A.first-B.first;
        scanf("%lld",&M);
        while(M--)
        {
            scanf("%lld",&a);
            printf("%lld\n",how[a]);
        }
    }
    return 0;
}

Compilation message (stderr)

designated_cities.cpp: In function 'int main()':
designated_cities.cpp:75:21: warning: unused variable 'k' [-Wunused-variable]
   75 |     long long M,i,j,k,a,b,c,d,where;
      |                     ^
designated_cities.cpp:76:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   76 |     scanf("%lld",&N);
      |     ~~~~~^~~~~~~~~~~
designated_cities.cpp:81:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   81 |         scanf("%lld %lld %lld %lld",&a,&b,&c,&d);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
designated_cities.cpp:106:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  106 |         scanf("%lld",&M);
      |         ~~~~~^~~~~~~~~~~
designated_cities.cpp:109:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  109 |             scanf("%lld",&a);
      |             ~~~~~^~~~~~~~~~~
designated_cities.cpp:125:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  125 |         scanf("%lld",&M);
      |         ~~~~~^~~~~~~~~~~
designated_cities.cpp:128:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  128 |             scanf("%lld",&a);
      |             ~~~~~^~~~~~~~~~~
designated_cities.cpp:123:22: warning: 'where' may be used uninitialized in this function [-Wmaybe-uninitialized]
  123 |         F4(where,-1,0);
      |                      ^

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