Submission #937528

#	Time	Username	Problem	Language	Result	Execution time	Memory
937528		guagua0407	Making Friends on Joitter is Fun (JOI20_joitter2)	C++17	1 / 100	5053 ms	29028 KiB

joitter2

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

int main() {_
    int n,m;
    cin>>n>>m;
    vector<vector<bool>> adj(n,vector<bool>(n));
    vector<vector<bool>> s1(n,vector<bool>(n));
    vector<vector<bool>> s2(n,vector<bool>(n));
    ll ans=0;
    for(int i=0;i<m;i++){
        int a,b;
        cin>>a>>b;
        a--;
        b--;
        if(adj[a][b]){
            cout<<ans<<'\n';
            continue;
        }
        queue<pair<int,int>> q;
        q.push({a,b});
        adj[a][b]=true;
        ans++;
        while(!q.empty()){
            auto tmp=q.front();
            q.pop();
            int v=tmp.f;
            int u=tmp.s;
            //cout<<v+1<<' '<<u+1<<'\n';
            if(!s1[v][u]){
                for(int i=0;i<n;i++){
                    if(i!=v and i!=u and adj[u][i] and adj[i][u]){
                        if(!adj[v][i]){
                            adj[v][i]=true;
                            ans++;
                            q.push({v,i});
                        }
                    }
                }
                s1[v][u]=true;
            }
            if(adj[v][u] and adj[u][v] and !s2[v][u]){
                for(int i=0;i<n;i++){
                    if(i!=v and i!=u and adj[i][v]^adj[i][u]){
                        if(adj[i][v]){
                            adj[i][u]=true;
                            ans++;
                            q.push({i,u});
                        }
                        else{
                            adj[i][v]=true;
                            ans++;
                            q.push({i,v});
                        }
                    }
                }
                s2[v][u]=s2[u][v]=true;
            }
        }
        cout<<ans<<'\n';
    }
    return 0;
}
//maybe its multiset not set
//yeeorz
//laborz

Compilation message (stderr)

joitter2.cpp: In function 'void setIO(std::string)':
joitter2.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
joitter2.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 1 / 1
• Subtask 2: 0 / 16
• Subtask 3: 0 / 83