feat: 62. Unique Paths

Author: gwbaik9717

unique-paths/gwbaik9717.js

@@ -0,0 +1,30 @@
+// m: height of grid, n: width of grid
+// Time complexity: O(m*n)
+// Space complexity: O(m*n)
+
+/**
+ * @param {number} m
+ * @param {number} n
+ * @return {number}
+ */
+var uniquePaths = function (m, n) {
+  const dp = Array.from({ length: m }, () =>
+    Array.from({ length: n }, () => 0)
+  );
+
+  dp[0][0] = 1;
+
+  for (let i = 0; i < m; i++) {
+    for (let j = 0; j < n; j++) {
+      if (i >= 1) {
+        dp[i][j] += dp[i - 1][j];
+      }
+
+      if (j >= 1) {
+        dp[i][j] += dp[i][j - 1];
+      }
+    }
+  }
+
+  return dp.at(-1).at(-1);
+};