add: 最大数和最小数

src/array/maximum-and-minimum.js

@@ -0,0 +1,18 @@
+/**
+ * @param matrix: an input matrix
+ * @return: nums[0]: the maximum,nums[1]: the minimum
+ */
+export const maxAndMin = function (matrix) {
+  if (matrix[0] === undefined || matrix[0][0] === undefined) return []
+  let max = matrix[0][0]
+  let min = matrix[0][0]
+
+  for (let n = 0, len = matrix.length; n < len; n++) {
+    for (let i = 0; i < matrix[0].length; i++) {
+      max = Math.max(max, matrix[n][i])
+      min = Math.min(min, matrix[n][i])
+    }
+  }
+
+  return [max, min]
+}