题解 就是有点慢

#include<bits/stdc++.h>
using namespace std;

int main(){
    int a[200005],sum1=0,sum2=0,n,m;
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        cin>>a[i];
        if(a[i]==1)sum1++;
        else sum2++;
    }
    for(int i=1;i<=m;i++){
        int l,r;
        cin>>l>>r;
        int f=(r-l+1);
        if(f%2==1){cout<<"sad\n";continue;}
        else{
            int h=f/2;
            if(sum1>=h&&sum2>=h)cout<<"happy\n";
            else cout<<"sad\n";
        }
    }
}