2177. Find Three Consecutive Integers That Sum to a Given Number

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problem

solution

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class Solution {
public:
    vector<long long> sumOfThree(long long num) {
        // 1 2 3 -> 6
        // 2 3 4 -> 9
        // 3 4 5 -> 12
        // 4 5 6 -> 15
        vector<long long>  ret;
        if(num%3!=0) return ret;
        long long mid = num/3;
        return {mid-1, mid, mid+1};
        
    }
};

analysis

  • time complexity O(1)
  • space complexity O(1)