Create 1687-delivering-boxes-from-storage-to-ports.js

Author: everthis

1687-delivering-boxes-from-storage-to-ports.js

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+/**
+ * @param {number[][]} boxes
+ * @param {number} portsCount
+ * @param {number} maxBoxes
+ * @param {number} maxWeight
+ * @return {number}
+ */
+var boxDelivering = function (boxes, portsCount, maxBoxes, maxWeight) {
+  const n = boxes.length
+  const diff = Array(n).fill(0)
+  for (let i = 0; i < n - 1; i++) {
+    if (boxes[i][0] != boxes[i + 1][0]) diff[i] = 1
+  }
+  const dp = Array(n).fill(0)
+  let cur = 0
+  let cbox = 0
+  let start = 0
+  for (let i = 0; i < n; i++) {
+    if (i - start == maxBoxes) {
+      cur -= boxes[start][1]
+      cbox -= diff[start]
+      start += 1
+    }
+    cur += boxes[i][1]
+    if (i > 0) cbox += diff[i - 1]
+    while (cur > maxWeight) {
+      cur -= boxes[start][1]
+      cbox -= diff[start]
+      start += 1
+    }
+    while (start < i && dp[start] == dp[start - 1]) {
+      cur -= boxes[start][1]
+      cbox -= diff[start]
+      start += 1
+    }
+    dp[i] = (start == 0 ? 0 : dp[start - 1]) + cbox + 2
+  }
+  return dp[n - 1]
+}