The sum of the last diagonal X29958
Write a program to find the sum of the last diagonal of the matrix. Given matrix M with R rows and C columns. Its last diagonal always contains element MR,C
Input
The first line provides two numbers: R and C the number of rows and columns in the matrix respectively. 0 ≤ R,C ≤ 1000. Next R lines with C integer numbers follows. All the absolute values of the matrix are less than or equal to 109.
Output
Print one integer number - the sum of the last diagonal.
Public test cases
Input
2 2 1 3 3 1
Output
2
Input
1 2 1 2
Output
2
Input
3 2 2 4 4 6 1 1
Output
5
Information
- Author
- Dmitry Bufistov
- Language
- English
- Translator
- Original language
- Spanish
- Other languages
- Spanish
- Official solutions
- C++ Python
- User solutions