Submission #1020825

#	Time	Username	Problem	Language	Result	Execution time	Memory
1020825		boyliguanhan	Teleporters (IOI08_teleporters)	C++17	100 / 100	583 ms	28316 KiB

teleporters

#include<bits/stdc++.h>
using namespace std;
int go[2000100],tele[2000100],st[2000100],sz;
bitset<2000100>vis;

int docycle(int n){
    int x=0;
    while(!vis[n])  
        x++,vis[n]=1,n=go[n];
    return x;
}
int main(){
    int n,m;
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        int x,y;
        cin>>x>>y;
        tele[x]=y;
        tele[y]=x;
        st[sz++]=x;
        st[sz++]=y;
    }
    sz++;
    st[sz++]=2e6+1;
    tele[(int)2e6+1]=2e6+1;
    sort(st,st+sz);
    for(int i=0;i<sz;i++){
        if(st[i]>2e6)break;
        go[st[i]]=tele[st[i+1]];
    }
    int x=0,y=0;
    while(x<=2e6)
        y++,vis[x]=1,x=go[x];
    priority_queue<int>pq;
    for(int i=0;i<sz;i++)
        if(!vis[st[i]])
            pq.push(docycle(st[i]));
    if(m>=pq.size())
        cout<<(n+m)*2-(n+m&1);
    else {
        while(m--)
            y+=2+pq.top(),pq.pop();
        cout<<y-1;
    }
}

Compilation message (stderr)

teleporters.cpp: In function 'int main()':
teleporters.cpp:38:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::priority_queue<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |     if(m>=pq.size())
      |        ~^~~~~~~~~~~
teleporters.cpp:39:25: warning: suggest parentheses around '+' in operand of '&' [-Wparentheses]
   39 |         cout<<(n+m)*2-(n+m&1);
      |                        ~^~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 5 / 5
• Subtask 7: 5 / 5
• Subtask 8: 5 / 5
• Subtask 9: 5 / 5
• Subtask 10: 5 / 5
• Subtask 11: 5 / 5
• Subtask 12: 5 / 5
• Subtask 13: 5 / 5
• Subtask 14: 5 / 5
• Subtask 15: 5 / 5
• Subtask 16: 5 / 5
• Subtask 17: 5 / 5
• Subtask 18: 5 / 5
• Subtask 19: 5 / 5
• Subtask 20: 5 / 5