40A - Find Color - CodeForces Solution

#include<bits/stdc++.h>

using namespace std;

#define endl "\n"
typedef long long ll;
const int N = 2005;
int a[N];

inline void f() {
    int x, y;
    cin >> x >> y;
    if (x * y == 0) {
        cout << "black" << endl;
        return;
    }
    int len_2 = x * x + y * y;
    for (int i = 1; i <= 2000; i++) {
        a[i] = i * i;
        if (a[i] == len_2) {
            cout << "black" << endl;
            return;
        }
        if (x * y > 0) {
            if (len_2 > i * i && len_2 < (i + 1) * (i + 1)) {
                if (i & 1) cout << "white" << endl;
                else cout << "black" << endl;
            }
        } else {
            if (len_2 > i * i && len_2 < (i + 1) * (i + 1)) {
                if (i & 1) cout << "black" << endl;
                else cout << "white" << endl;
            }
        }
    }
}

int main() {
    ios::sync_with_stdio(0);
    cout.tie(0);
    cin.tie(0);
    f();
    return 0;
}