Submission #345807

#	Time	Username	Problem	Language	Result	Execution time	Memory
345807		daniel920712	Crocodile's Underground City (IOI11_crocodile)	C++14	89 / 100	2086 ms	183964 KiB

crocodile

#include "crocodile.h"
#include <vector>
#include <utility>
#include <algorithm>
#include <queue>
#include <map>
using namespace std;
bool is[100005];
long long small[5][100005];
vector < pair < long long , long long > > Next[100005];
vector < pair < long long , long long > > Next2[100005];
map < long long , long long > how[100005];
bool have[100005]={0};
long long ans=0;
priority_queue < pair < long long , pair < long long , long long > > , vector < pair < long long , pair < long long , long long > > > , greater < pair < long long , pair < long long , long long > > > > dij;
long long F(long long fa,long long here,long long con)
{
    long long t;
    vector < pair < long long , long long > > tt;
    //printf("%lld %lld\n",here,con);
    if(is[here])
    {
        ans=con;
        return 0;
    }
    for(auto i:Next[here]) if(small[1][i.first]!=-1) tt.push_back(make_pair(small[1][i.first],i.first));


    sort(tt.begin(),tt.end());
    if(tt.size()>=2)
    {
        return F(here,tt[1].second,con+how[here][tt[1].second]);
    }
}
int travel_plan(int N, int M, int R[][2], int L[], int K, int P[])
{
    int i;
    long long a,b,c;
    for(i=0;i<M;i++)
    {
        Next[R[i][0]].push_back(make_pair((long long) R[i][1],(long long) L[i]));
        Next[R[i][1]].push_back(make_pair((long long) R[i][0],(long long) L[i]));
        how[R[i][0]][R[i][1]]=L[i];
        how[R[i][1]][R[i][0]]=L[i];
    }
    for(i=0;i<N;i++)
    {
        small[0][i]=-1;
        small[1][i]=-1;
    }
    for(i=0;i<K;i++)
    {
        is[P[i]]=1;
        dij.push(make_pair(0,make_pair(P[i],-1)));
        small[0][P[i]]=0;
        small[1][P[i]]=0;

    }
    while(!dij.empty())
    {
        a=dij.top().first;
        b=dij.top().second.first;
        c=dij.top().second.second;
        dij.pop();
        
        if(is[b]&&small[0][b]==0)
        {
            small[0][b]=-2;
            for(auto i:Next[b])
            {
                dij.push(make_pair(i.second+a,make_pair(i.first,b)));
            }
        }
        else if(small[0][b]==-1) small[0][b]=a;
        else if(small[1][b]==-1)
        {
            small[1][b]=a;
            for(auto i:Next[b])
            {
                dij.push(make_pair(i.second+a,make_pair(i.first,b)));
            }
        }
        else continue;
    }

    return small[1][0];
}

Compilation message (stderr)

crocodile.cpp: In function 'long long int F(long long int, long long int, long long int)':
crocodile.cpp:18:15: warning: unused variable 't' [-Wunused-variable]
   18 |     long long t;
      |               ^
crocodile.cpp: In function 'int travel_plan(int, int, int (*)[2], int*, int, int*)':
crocodile.cpp:38:19: warning: variable 'c' set but not used [-Wunused-but-set-variable]
   38 |     long long a,b,c;
      |                   ^
crocodile.cpp: In function 'long long int F(long long int, long long int, long long int)':
crocodile.cpp:19:47: warning: control reaches end of non-void function [-Wreturn-type]
   19 |     vector < pair < long long , long long > > tt;
      |                                               ^~

• Subtask 1: 46 / 46
• Subtask 2: 43 / 43
• Subtask 3: 0 / 11