[CPP] 704. Binary Search

Author: UnresolvedCold

cpp/704-Binary-Search.cpp

@@ -0,0 +1,23 @@
+class Solution {
+public:
+    int search(vector<int>& nums, int target) {
+        int n = nums.size();
+        if (nums[0] == target) return 0;
+        if (nums[n-1] == target) return n-1;
+        
+        int start = 0, end = n-1;
+        
+        while (start < end) {
+            int mid = start + (end-start)/2;
+            if (nums[mid] == target) return mid;
+            if (nums[mid] > target) {
+                end = mid;
+            }
+            else {
+                start = mid + 1;
+            }
+        }
+        
+        return -1;
+    }
+};