134-Gas-Station.cs

public class Solution {
    public int CanCompleteCircuit(int[] gas, int[] cost) {
        if (gas.Sum() < cost.Sum()) {
            return -1;
        }
        
        int res = 0, total = 0; 
        
        for (int i = 0; i < gas.Length; i++) {
            total += gas[i] - cost[i];
            if (total < 0) {
                total = 0;
                res = i + 1;
            }
        }
        return res;
    }
}