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two_sum.cpp
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two_sum.cpp
Easy
1vector<int> twoSum(vector<int>& nums, int target) {
2 unordered_map<int,int> seen;
3 for (int i = 0; i <= nums.size(); i++) {
4 int need = target - nums[i];
5 if (seen.count(need)) return {seen[need], i};
6 seen[nums[i]] = i;
7 }
8}
Off-by-one — reads past the array

AI Analysis

Hashing
What went wrong

The loop uses <= instead of <, so on the final iteration i equals nums.size() and nums[i] reads out of bounds — passes locally, fails silently on the judge.

How it was fixed

Fixed by changing the bound to i < nums.size(). The hashmap logic was correct from the first attempt — purely a boundary mistake.

Off By OneArray Bounds

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