LeetCode 2221: Find Triangular Sum of an Array Solution
Master LeetCode problem 2221 (Find Triangular Sum of an Array), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
2221. Find Triangular Sum of an Array
Problem Explanation
Explanation:
To solve this problem, we iterate through the array nums repeatedly until there is only one element left. At each iteration, we compute the new array newNums by applying the given operation (nums[i] + nums[i+1]) % 10 to each pair of adjacent elements. We then replace the original array nums with newNums and continue the process. Finally, when there is only one element left in the array, we return that element as the triangular sum.
- Time complexity: O(n^2) where n is the number of elements in the input array.
- Space complexity: O(n) for the new array created at each iteration.
:
Solution Code
class Solution {
public int findTriangularSum(int[] nums) {
while(nums.length > 1) {
int[] newNums = new int[nums.length - 1];
for(int i = 0; i < nums.length - 1; i++) {
newNums[i] = (nums[i] + nums[i+1]) % 10;
}
nums = newNums;
}
return nums[0];
}
}Try It Yourself
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