### Problem

There are N gas stations along a circular route, where the amount of gas at station i is gas[i].

You have a car with an unlimited gas tank and it costs cost[i] of gas to travel from station i to its next station (i+1). You begin the journey with an empty tank at one of the gas stations.

Return the starting gas station's index if you can travel around the circuit once, otherwise return -1.

### JavaScript Code

function canCompleteCircuit(gas, cost) { var sumRemaining = 0; // track current remaining var total = 0; // track total remaining var start = 0; for (var i = 0; i < gas.length; i++) { var remaining = gas[i] - cost[i]; //if sum remaining of (i-1) >= 0, continue if (sumRemaining >= 0) { sumRemaining += remaining; //otherwise, reset start index to be current } else { sumRemaining = remaining; start = i; } total += remaining; } if (total >= 0){ return start; }else{ return -1; } } console.log(canCompleteCircuit([1,2,3,4,5],[1,3,2,4,5]));

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