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divide-integers_test.cpp
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divide-integers_test.cpp
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#include <bits/stdc++.h>
using namespace std;
#define DEBUG(x) \
do { \
std::cout << #x << ": " << x << " "; \
} while (0)
#define DEBUGL(x) \
do { \
std::cout << #x << ": " << x << "\n"; \
} while (0)
// Time - O(Log A), Space - O(1)
// where A = dividend
int solve(int A, int B) {
int dividend = A;
int divisor = B;
if ((divisor == 0) || (dividend == INT_MIN && divisor == -1)) {
return INT_MAX;
}
bool is_negative = ((dividend < 0) ^ (divisor < 0));
long long divisor_abs = labs(divisor);
long long dividend_abs = labs(dividend);
int result = 0;
while (dividend_abs >= divisor_abs) {
long long multiple = divisor_abs, multiplier = 1;
while (dividend_abs >= (multiple << 1)) {
multiple <<= 1;
multiplier <<= 1;
}
dividend_abs -= multiple;
result += multiplier;
}
if (is_negative) {
return -result;
}
return result;
}
int main() {
// ios::sync_with_stdio(0);
// cin.tie(0);
int dividend = 43;
int divisor = -8;
cout << solve(dividend, divisor) << "\n";
return 0;
}