$\textcolor{red}{0}$分蒟蒻求帮助

有大佬能帮我debug一下吗😭(帮助必关)

#include<bits/stdc++.h>
using namespace std;
int main(){
    int i,j,k,a,s;
    i = 0;
    j = 0;
    k = 0;
    cin >> a;
    s = 0;
    for(;i<=a;i++){
        for(;j<=a;j++){
            for(;k<=a;k++){
                if(k*k + j*j == i*i){
                    s = s + 1;
                }
            }
        }
    }
    cout << s;
    return 0;
}

$\textcolor{white}{刚来洛谷的蒟蒻，码风不好勿喷}$