Submission #1110603

#	Time	Username	Problem	Language	Result	Execution time	Memory
1110603		Khalid_Alabdullatif	Traffic (CEOI11_tra)	C++14	100 / 100	1018 ms	74984 KiB

tra

#include "bits/stdc++.h"
#define ll long long
using namespace std;
const int N=5e5+1,mod=1e9+7;
vector<int>l,r;
vector<vector<int>>v(N),rev(N);
int n,m,A,B;
int x[N],y[N];
bool vis[N],removed[N];
void dfs(int idx){
    vis[idx]=1;
    for(auto i:v[idx])
        if(!vis[i] && !removed[i])
            dfs(i);
    
}
void del(int idx){
    vis[idx]=1;
    for(auto i:v[idx])
        if(!vis[i])
            del(i);
}
void delr(int idx){
    vis[idx]=1;
    for(auto i:rev[idx])
        if(!vis[i])
            delr(i);
}
int mx[N],mn[N];
int main(){
    cin>>n>>m>>A>>B;
    for(int i=1;i<=n;i++){
        cin>>x[i]>>y[i];
        if(x[i]==0)
            l.push_back(i);
        if(x[i]==A)
            r.push_back(i);
    }
    sort(l.begin(),l.end(),[](int i, int j){
       return y[i] < y[j]; 
    });
    sort(r.begin(),r.end(),[](int i, int j){
       return y[i] < y[j]; 
    });
    //reverse(l.begin(),l.end());
    while(m--){
        int d,c,k;
        cin>>c>>d>>k;
        v[c].push_back(d);
        rev[d].push_back(c);
        if(k==2){
            v[d].push_back(c);
            rev[c].push_back(d);
        }
    }
    vector<int>r1;
    for(auto i:l)
        del(i);
    for(int i=1;i<=n;i++)
        if(!vis[i])
            removed[i]=1;

    memset(vis,0,sizeof vis);
    for(auto i:r)
        delr(i);
    for(int i=1;i<=n;i++)
        if(!vis[i])
            removed[i]=1;
    for(int i=0;i<r.size();i++)
        if(!removed[r[i]])
            r1.push_back(r[i]);
    int szl=l.size(),szr1=r1.size();
    memset(vis,0,sizeof vis);
    int idx=0;
    for(int i=0;i<szl;i++){
        if(removed[l[i]])continue;
        dfs(l[i]);
        while(idx+1<szr1 && vis[r1[idx+1]])
            idx++;
        mx[i]=idx;
    }
    memset(vis,0,sizeof vis);
    idx=szr1-1;
    for(int i=szl-1;i>=0;i--){
        if(removed[l[i]])continue;
        dfs(l[i]);
        while(idx-1>=0 && vis[r1[idx-1]])
            idx--;
        mn[i]=idx;
    }
    vector<int>ans;
    for(int i=0;i<szl;i++){
        if(removed[l[i]]) ans.push_back(0);
        else ans.push_back(mx[i]-mn[i]+1);
    }
    reverse(ans.begin(),ans.end());
    for(auto i:ans)cout<<i<<'\n';
    return 0;
}

Compilation message (stderr)

tra.cpp: In function 'int main()':
tra.cpp:69:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   69 |     for(int i=0;i<r.size();i++)
      |                 ~^~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 8 / 8
• Subtask 3: 8 / 8
• Subtask 4: 8 / 8
• Subtask 5: 8 / 8
• Subtask 6: 8 / 8
• Subtask 7: 8 / 8
• Subtask 8: 8 / 8
• Subtask 9: 9 / 9
• Subtask 10: 9 / 9
• Subtask 11: 9 / 9
• Subtask 12: 9 / 9