Create 1260-shift-2d-grid.js

Author: everthis

1260-shift-2d-grid.js

@@ -0,0 +1,24 @@
+/**
+ * @param {number[][]} grid
+ * @param {number} k
+ * @return {number[][]}
+ */
+const shiftGrid = function(grid, k) {
+  for(let i = 0; i < k; i++) once(grid)
+  return grid
+};
+
+function once(grid) {
+  const m = grid.length, n = grid[0].length
+  let last = grid[m - 1][n - 1]
+  for(let i = 0; i < m; i++) {
+    let pre = grid[i][0]
+    for(let j = 1; j < n; j++) {
+      let cur = grid[i][j]
+      grid[i][j] = pre
+      pre = cur
+    }
+    grid[i][0] = last
+    last = pre
+  }
+}