Submission #598208

#	Time	Username	Problem	Language	Result	Execution time	Memory
598208		reni	Simple game (IZhO17_game)	C++17	100 / 100	79 ms	10204 KiB

game

#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
long long a[1000001], fen[1000001];
void update(long long pos,long long val)
{
    for(int i=pos;i<=1000000;i+=(i&-i))
    {
        fen[i]+=val;
    }
}
long long query(long long val)
{
    long long sum=0;
    for(int i=val;i>0;i-=(i&-i))
    {
        sum+=fen[i];
    }
    return sum;
}
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    long long i,j,n,m,t,pos,val;

    cin>>n>>m;

    for(i=1;i<=n;i++)
    {
        cin>>a[i];

        if(i!=1){
            update(min(a[i-1],a[i]),1);
            update(max(a[i-1],a[i]),-1);
        }
    }

    for(i=1;i<=m;i++)
    {
        cin>>t;

        if(t==1)
        {
            cin>>pos>>val;

            if(pos>1)
            {
                update(min(a[pos-1],a[pos]),-1);
                update(max(a[pos-1],a[pos]),1);
                update(min(a[pos-1],val),1),
                update(max(a[pos-1],val),-1);
            }
            if(pos<n)
            {
                update(min(a[pos+1],a[pos]),-1);
                update(max(a[pos+1],a[pos]),1);
                update(min(a[pos+1],val),1),
                update(max(a[pos+1],val),-1);
            }
            a[pos]=val;
        }
        else
        {
            cin>>val;
            cout<<query(val)<<endl;
        }
    }

}

Compilation message (stderr)

game.cpp: In function 'int main()':
game.cpp:27:17: warning: unused variable 'j' [-Wunused-variable]
   27 |     long long i,j,n,m,t,pos,val;
      |                 ^

• Subtask 1: 22 / 22
• Subtask 2: 27 / 27
• Subtask 3: 51 / 51