Create 1631-path-with-minimum-effort.js

Author: everthis

1631-path-with-minimum-effort.js

@@ -0,0 +1,50 @@
+/**
+ * @param {number[][]} heights
+ * @return {number}
+ */
+const minimumEffortPath = function (heights) {
+  const d = [0, 1, 0, -1, 0]
+  let lo = 0,
+    hi = 10 ** 6 + 1
+  while (lo < hi) {
+    let effort = lo + ((hi - lo) >> 1)
+    if (isPath(heights, effort)) {
+      hi = effort
+    } else {
+      lo = effort + 1
+    }
+  }
+  return lo
+  function isPath(h, effort) {
+    const m = h.length,
+      n = h[0].length
+    const q = []
+    q.push([0, 0])
+    const seen = new Set()
+    seen.add(0)
+    while (q.length) {
+      const cur = q.shift()
+      const x = cur[0],
+        y = cur[1]
+      if (x === m - 1 && y === n - 1) {
+        return true
+      }
+      for (let k = 0; k < 4; k++) {
+        const r = x + d[k],
+          c = y + d[k + 1]
+        if(seen.has(r * n + c)) continue
+        if (
+          0 <= r &&
+          r < m &&
+          0 <= c &&
+          c < n &&
+          effort >= Math.abs(h[r][c] - h[x][y])
+        ) {
+          seen.add(r * n + c)
+          q.push([r, c])
+        }
+      }
+    }
+    return false
+  }
+}