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sqrtx-69/Cargo.toml

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+[package]
+name = "sqrtx-69"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

sqrtx-69/src/main.rs

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+// fn my_sqrt(x: i32) -> i32 {
+//     let mut upper_range = x / 2;
+//     let mut last_i = 0;
+
+//     if x <= 5 {
+//         upper_range = x;
+//     }
+
+//     if x >= i32::MAX {
+//         return (i32::MAX as f64).sqrt().floor() as i32;
+//     }
+
+//     for i in 0..=upper_range {
+//         let power_of_2 = i * i;
+
+//         if power_of_2 == x {
+//             return i;
+//         } else if power_of_2 > x {
+//             return last_i;
+//         } else {
+//             last_i = i;
+//         }
+//     }
+//     0
+// }
+
+fn my_sqrt(x: i32) -> i32 {
+    if x < 2 {
+        return x; // Early return for 0 and 1
+    }
+
+    let mut right = 46340.min(x / 2);
+
+    if x >= right * right {
+        return right;
+    }
+
+    let mut left = 2;
+
+    while left <= right {
+        let mid = left + (right - left) / 2;
+        let mid_squared = mid * mid;
+
+        if mid_squared == x {
+            return mid;
+        } else if mid_squared < x {
+            left = mid + 1;
+        } else {
+            right = mid - 1;
+        }
+    }
+
+    right // After the loop, `right` is the largest value whose square is <= x}
+}
+
+fn main() {
+    // let sol = my_sqrt(2147483647);
+    let sol = my_sqrt(2147395599);
+    println!("{}", sol);
+}