Gas tank

input/code.cpp: In function 'int main()':
input/code.cpp:49:18: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'ull' {aka 'long long unsigned int'} [-Wsign-compare]
   49 |     for(ll b=1; b<maxv; b++){
      |                 ~^~~~~

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;

ll val(ll A, ll B){
    return A*A*B + B*B*A;
}

ll binsearchA(ll B, ll N){
    ll b = 1<<30;
    ll a = 0;
    ll s = 0;

    while(b){
        ll a2 = a | b;
        ll v = val(a2, B);
        ll s2 = N - v;
        cout << "this: " << a2 << " " << s2 << "\n";
        if(s2 >= 0 && s2 < s){
            s = s2;
            a = a2;
        }
        b >>= 1;
    }
    return a;
}

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);

    ll N;
    cin >> N;

    if(N == 0){
        cout << "0 0\n";
        return 0;
    }
    if(N == 1){
        cout << "1 0\n";
        return 0;
    }

    ull maxv = pow(N/2+1, 1.0/3)+1;
    ll bA = 0, bB = 0;
    ll bS = (unsigned)(-1);

    for(ll b=1; b<maxv; b++){
        ll a = binsearchA(b, N);
        cout << "this: " << b << " " << a << "\n";
        ll v = val(a,b);
        ll s = N - v;
        if(s >= 0 && s < bS){
            bS = s;
            bA = a;
            bB = b;
        }
    }
    cout << bA << " " << bB << "\n";
}

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