Create 1572.js

Author: Barklim

example/ProgrammingSkills/1.Simulation/1572.js

@@ -0,0 +1,27 @@
+/**
+ * @param {string} s
+ * @return {number}
+ */
+var diagonalSum = function(mat) {
+
+};
+
+const example1 = diagonalSum([[1,2,3],[4,5,6],[7,8,9]]); // 25
+const example2 = diagonalSum([[1,1,1,1],[1,1,1,1],[1,1,1,1],[1,1,1,1]]); // 8
+
+console.log(example1);
+console.log(example2);
+
+// var diagonalSum = function(mat) {
+//     let n = mat.length;
+//     let row = 0;
+
+//     const lambda = (sum, vec) => {
+//         sum += vec[row];
+//         if (row !== n - row - 1) sum += vec[n - row - 1];
+//         row++;
+//         return sum;
+//     };
+
+//     return mat.reduce(lambda, 0);
+// };

example/README.md

@@ -257,4 +257,5 @@ Better order to solve problems
 ### [0.Basic](https://github.com/Barklim/leetcode-javascript/tree/master/example/ProgrammingSkills/1.Simulation)
 
 58. Length of Last Word
-1041. Robot Bounded In Circle
+1041. Robot Bounded In Circle
+1572. Matrix Diagonal Sum