제출 #667629

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
667629		berr	Star Trek (CEOI20_startrek)	C++17	7 / 100	3 ms	4948 KiB

startrek

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int N=1e5+37;
vector<int> adj[N], adj2[N];
int huh, huuh, mod=1e9+7;

int mul(int x, int y){
    return (x*y)%mod;
}

int poww(int x, int y)
{
    if(y==0) return 1;
    int tmp=poww(x, y/2);

    if(y%2) return mul(tmp, mul(tmp, x));
    return mul(tmp, tmp); 
}

int dfs2(int v, int p, int d)
{
    int f=1;

    if(d%2==0) f=0;

    int count=0, val=0;

    for(auto i: adj2[v])
    {
        if(i==p) continue;

        if(dfs2(i, v, d+1))
        {
         
            if(d%2==0){
                f=1;
            }
        }
        else
        {
            if(d%2) f=0;
        }
    }




    return f;
}


int dfs(int v, int p, int d)
{
    int f=1;

    if(d%2==0) f=0;

    int count=0, val=0;

    for(auto i: adj[v])
    {
        if(i==p) continue;

        if(dfs(i, v, d+1))
        {
         
            if(d%2==0){
                f=1;
            }
        }
        else
        {
            if(d%2) f=0;
        }
    }

    if(huh==v)
    {   
        if(dfs2(huuh, 0, d+1)) 
        {
            if(d%2==0) f=1;
        }
        else
        {
            if(d%2) f=0;
        }
    }

    return f;
}


signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n, d; cin>>n>>d;


    /*for(int i=0; i<n-1; i++){
        int x, y; cin>>x>>y;

        adj[x].push_back(y);
        adj[y].push_back(x);

        adj2[x].push_back(y);
        adj2[y].push_back(x);
    }

    int ans=0;

    /*if(n<=1e4)
    {
        for(int i=1; i<=n; i++)
        {
            for(int l=1; l<=n; l++)
            {
                huh=i;
                huuh=l;
                if(dfs(1, 0, 0)) ans++, cout<<i<<" "<<l<<"\n";
            }
        }
        cout<<ans;

    }

    else*/
    {
        cout<<poww(4, d);
    }

}

컴파일 시 표준 에러 (stderr) 메시지

startrek.cpp:114:5: warning: "/*" within comment [-Wcomment]
  114 |     /*if(n<=1e4)
      |      
startrek.cpp: In function 'long long int dfs2(long long int, long long int, long long int)':
startrek.cpp:27:9: warning: unused variable 'count' [-Wunused-variable]
   27 |     int count=0, val=0;
      |         ^~~~~
startrek.cpp:27:18: warning: unused variable 'val' [-Wunused-variable]
   27 |     int count=0, val=0;
      |                  ^~~
startrek.cpp: In function 'long long int dfs(long long int, long long int, long long int)':
startrek.cpp:59:9: warning: unused variable 'count' [-Wunused-variable]
   59 |     int count=0, val=0;
      |         ^~~~~
startrek.cpp:59:18: warning: unused variable 'val' [-Wunused-variable]
   59 |     int count=0, val=0;
      |                  ^~~

• Subtask 1: 0 / 0
• Subtask 2: 7 / 7
• Subtask 3: 0 / 8
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 15