Submission #1304822

#	Time	Username	Problem	Language	Result	Execution time	Memory
1304822		yusifm	Shell (info1cup18_shell)	C++20	0 / 100	1095 ms	568 KiB

shell

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#define ll long long
#define str string
#define pb push_back
#define pf push_front
#define in insert
#define all(v) v.begin(),v.end()
const int sz=200001,INF=1000000000;
using namespace std;
ll n,m,l,num,num1,num2,Res,ans=0;
bool flag;
vector<ll>Nums;
vector<bool>isSeen(sz);
vector<pair<ll,ll>>nums;
vector<vector<ll>>res;
set<ll>nodes;
void bfs(ll num)
{
    queue<ll>numS;
    numS.push(num);
    isSeen[num]=true;
    while(numS.size()!=0)
    {
        Res=numS.front();
        numS.pop();
        for(int i=0;i<res[Res].size();i++)
        {
            if(!isSeen[res[Res][i]])
            {
                numS.push(res[Res][i]);
                isSeen[res[Res][i]]=true;
            }
        }
    }
}
void solve()
{
    cin>>n>>m>>l;
    for(int i=0;i<l;i++)
    {
        cin>>num;
        Nums.pb(num);
    }
    for(int i=0;i<m;i++)
    {
        cin>>num1>>num2;
        nums.pb({num1,num2});
    }
    for(int i=1;i<pow(2,m);i++)
    {
        flag=false,res.clear(),res.resize(n+1),fill(all(isSeen),false),nodes.clear();
        for(int j=0;j<m;j++)
        {
            if(i&(ll)pow(2,j))
            {
                res[nums[j].first].pb(nums[j].second),nodes.in(nums[j].first),nodes.in(nums[j].second);
            }
        }
        if(res[1].size()!=0)
        {
            bfs(1);
            for(int i=1;i<=n;i++)
            {
                if(res[i].size()>=2)
                {
                    flag=true;
                    break;
                }
            }
            for(auto node:nodes)
            {
                if(!isSeen[node])
                {
                    flag=true;
                    break;
                }
            }
            if(!flag)
            {
                ans++;
            }
        }
    }
    cout<<ans;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr),cout.tie(nullptr);
    ll t=1;
    //cin>>t;
    while(t--)
    {
        solve();
    }
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 45
• Subtask 3: 0 / 20
• Subtask 4: 0 / 25