Submission #903248

#	Time	Username	Problem	Language	Result	Execution time	Memory
903248		simona1230	Inside information (BOI21_servers)	C++17	5 / 100	1995 ms	524288 KiB

servers

#include <bits/stdc++.h>

using namespace std;

int n,k;
int in[4001][4001];

void slow()
{
    for(int i=1;i<=n;i++)
        in[i][i]=1;
    for(int i=1;i<=n+k-1;i++)
    {
        char c;
        cin>>c;
        int x,y;
        if(c=='S')
        {
            cin>>x>>y;
            for(int j=1;j<=n;j++)
            {
                in[x][j]=in[y][j]=max(in[x][j],in[y][j]);
            }
        }
        if(c=='C')
        {
            cin>>x;
            int cnt=0;
            for(int j=1;j<=n;j++)
                cnt+=in[j][x];
            cout<<cnt<<endl;
        }
        if(c=='Q')
        {
            cin>>x>>y;
            if(in[x][y])cout<<"yes"<<endl;
            else cout<<"no"<<endl;
        }
    }
}


int t[120001];
void subt2()
{
    t[1]=1;
    int sec=2;
    for(int i=1;i<=n+k-1;i++)
    {
        char c;
        cin>>c;

        if(c=='S')
        {
            int x,y;
            cin>>x>>y;

            t[max(x,y)]=sec++;
        }

        if(c=='Q')
        {
            int x,y;
            cin>>x>>y;

            if(t[y]&&t[y]<=t[x]||x==1&&t[y]||y==1&&t[x]||x==y)cout<<"yes"<<endl;
            else cout<<"no"<<endl;
        }

        if(c=='C')
        {
            int x;
            cin>>x;

            if(t[x]==0)cout<<1<<endl;
            else if(x==1)cout<<sec-1<<endl;
            else cout<<sec-t[x]+1<<endl;
        }
    }
}

int inc[120001],de[120001];
int find_inc(int ver)
{
    if(ver==inc[ver])return ver;
    return inc[ver]=find_inc(ver);
}
int find_de(int ver)
{
    if(ver==de[ver])return ver;
    return de[ver]=find_de(ver);
}

void subt3()
{
    int sec=1;
    for(int i=1;i<=n+k-1;i++)
    {
        int x,y;
        char c;
        cin>>c>>x;
        if(c=='S')
        {
            cin>>y;
            if(y<x)swap(x,y);
            t[x]=sec;
            inc[x]=de[x]=x;
            if(t[x-1])inc[x-1]=x;
            if(t[x+1])de[x+1]=x;
        }
        if(c=='Q')
        {
            cin>>y;
            int ver=x;
            if(y>x)
            {
                ver=find_inc(ver);
                if(ver+1>=y)cout<<"yes"<<endl;
                else cout<<"no"<<endl;
            }
            else
            {
                ver=find_de(ver-1);
                if(ver<=y)cout<<"yes"<<endl;
                else cout<<"no"<<endl;
            }
        }
    }
}

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);

	cin>>n>>k;
	if(n<=4000)slow();
    else subt3();

	return 0;
}

Compilation message (stderr)

servers.cpp: In function 'void subt2()':
servers.cpp:66:20: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   66 |             if(t[y]&&t[y]<=t[x]||x==1&&t[y]||y==1&&t[x]||x==y)cout<<"yes"<<endl;
      |                ~~~~^~~~~~~~~~~~
servers.cpp:66:50: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   66 |             if(t[y]&&t[y]<=t[x]||x==1&&t[y]||y==1&&t[x]||x==y)cout<<"yes"<<endl;
      |                                              ~~~~^~~~~~

• Subtask 1: 2.5 / 2.5
• Subtask 2: 2.5 / 2.5
• Subtask 3: 0 / 2.5
• Subtask 4: 0 / 2.5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 5
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 12.5
• Subtask 10: 0 / 12.5
• Subtask 11: 0 / 17.5
• Subtask 12: 0 / 17.5