feat: add javascript solution to lc problem: No.1870.Minimum Speed to Arrive on Time (doocs#403)

Author: zhaocchen

solution/1800-1899/1870.Minimum Speed to Arrive on Time/README.md

@@ -129,6 +129,42 @@ class Solution {
 }
 ```
 
+### **JavaScript**
+
+```js
+/**
+ * @param {number[]} dist
+ * @param {number} hour
+ * @return {number}
+ */
+ var minSpeedOnTime = function(dist, hour) {
+    if (dist.length > Math.ceil(hour)) return -1;
+    let left = 1, right = 10 ** 7;
+    while (left < right) {
+        let mid = (left + right) >> 1;
+        if (arriveOnTime(dist, mid, hour)) {
+            right = mid;
+        } else {
+            left = mid + 1;
+        }
+    }
+    return left;
+ };
+ 
+ function arriveOnTime (dist, speed, hour) {
+    let res = 0.0;
+    let n = dist.length;
+    for (let i = 0; i < n; i++) {
+        let cost = parseFloat(dist[i]) / speed;
+        if (i != n - 1) {
+            cost = Math.ceil(cost);
+        }
+        res += cost;
+    }
+    return res <= hour;
+ }
+```
+
 ### **...**
 
 ```

solution/1800-1899/1870.Minimum Speed to Arrive on Time/README_EN.md

@@ -117,6 +117,42 @@ class Solution {
 }
 ```
 
+### **JavaScript**
+
+```js
+/**
+ * @param {number[]} dist
+ * @param {number} hour
+ * @return {number}
+ */
+ var minSpeedOnTime = function(dist, hour) {
+    if (dist.length > Math.ceil(hour)) return -1;
+    let left = 1, right = 10 ** 7;
+    while (left < right) {
+        let mid = (left + right) >> 1;
+        if (arriveOnTime(dist, mid, hour)) {
+            right = mid;
+        } else {
+            left = mid + 1;
+        }
+    }
+    return left;
+ };
+ 
+ function arriveOnTime (dist, speed, hour) {
+    let res = 0.0;
+    let n = dist.length;
+    for (let i = 0; i < n; i++) {
+        let cost = parseFloat(dist[i]) / speed;
+        if (i != n - 1) {
+            cost = Math.ceil(cost);
+        }
+        res += cost;
+    }
+    return res <= hour;
+ }
+```
+
 ### **...**
 
 ```

solution/1800-1899/1870.Minimum Speed to Arrive on Time/Solution.js

@@ -0,0 +1,31 @@
+/**
+ * @param {number[]} dist
+ * @param {number} hour
+ * @return {number}
+ */
+ var minSpeedOnTime = function(dist, hour) {
+    if (dist.length > Math.ceil(hour)) return -1;
+    let left = 1, right = 10 ** 7;
+    while (left < right) {
+        let mid = (left + right) >> 1;
+        if (arriveOnTime(dist, mid, hour)) {
+            right = mid;
+        } else {
+            left = mid + 1;
+        }
+    }
+    return left;
+ };
+ 
+ function arriveOnTime (dist, speed, hour) {
+    let res = 0.0;
+    let n = dist.length;
+    for (let i = 0; i < n; i++) {
+        let cost = parseFloat(dist[i]) / speed;
+        if (i != n - 1) {
+            cost = Math.ceil(cost);
+        }
+        res += cost;
+    }
+    return res <= hour;
+ }