Create 892.三维形体的表面积.js

Author: yinxin630

892.三维形体的表面积.js

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+/**
+ * @param {number[][]} grid
+ * @return {number}
+ */
+var surfaceArea = function(grid) {
+    let result = 0;
+    for (let i = 0; i < grid.length; i++) {
+        for (let j = 0; j < grid[i].length; j++) {
+            result += grid[i][j] ? grid[i][j] * 4 + 2 : 0;
+            if (i !== 0) {
+                result -= Math.min(grid[i - 1][j], grid[i][j]) * 2;
+            }
+            if (j !== 0) {
+                result -= Math.min(grid[i][j - 1], grid[i][j]) * 2;
+            }
+        }
+    }
+    return result;
+};