update: 134

Author: hijiangtao

README.md

@@ -46,6 +46,7 @@ This is the solutions collection of my LeetCode submissions, most of them are pr
 |127|[Word Ladder](https://leetcode.com/problems/word-ladder/) | [JavaScript](./src/word-ladder/res.js)|Medium|
 |130|[Surrounded Regions](https://leetcode.com/problems/surrounded-regions/) | [JavaScript](./src/surrounded-regions/res.js)|Medium|
 |133|[Clone Graph](https://leetcode.com/problems/clone-graph/) | [JavaScript](./src/clone-graph/res.js)|Medium|
+|134|[Gas Station](https://leetcode.com/problems/gas-station/) | [JavaScript](./src/gas-station/res.js)|Medium|
 |136|[Single Number](https://leetcode.com/problems/single-number/) | [JavaScript](./src/single-number/res.js)|Easy|
 |137|[Single Number II](https://leetcode.com/problems/single-number-ii/) | [JavaScript](./src/single-number-ii/res.js)|Medium|
 |151|[Reverse Words in a String](https://leetcode.com/problems/reverse-words-in-a-string/) | [JavaScript](./src/reverse-words-in-a-string/res.js)|Medium|

src/gas-station/res.js

@@ -0,0 +1,26 @@
+/**
+ * @param {number[]} gas
+ * @param {number[]} cost
+ * @return {number}
+ */
+var canCompleteCircuit = function(gas, cost) {
+    let total_tank = 0, curr_tank = 0;
+    let flag = 0;
+    
+    for (let index = 0; index < gas.length; index++) {
+      const remain = gas[index] - cost[index];
+      
+      total_tank += remain;
+      if (curr_tank + remain < 0) {
+        flag = index+1;
+        curr_tank = 0;
+      } else {
+        curr_tank += remain;
+      }
+
+    }
+
+    if (total_tank < 0) return -1;
+
+    return flag;
+};