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- #include <iostream>
- using namespace std;
- int sqrt(int x, int l, int r) {
- int m = (l + r) / 2;
- if ((m + 1) * (m + 1) > x && m * m <= x) {
- return m;
- }
- if (m * m < x) {
- return sqrt(x, m, r);
- } else {
- return sqrt(x, l, m);
- }
- }
- int main() {
- // Example usage
- int n;
- cin >> n;
- cout << sqrt(n, 1, n) << endl;
- return 0;
- }
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