LeetCode——Gas Station
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.
Note:
The solution is guaranteed to be unique.
贪心or动态规划?
从gas[0]开始走,遇到油不够的情况,开始station就后退一步,利用以前算的结果可以只算出第一步的油量。直到最后,算出circle的连接点是否满足。
public class Solution {
public int canCompleteCircuit(int[] gas, int[] cost) { int n = gas.length; int start = 0, end = 0, have = 0, cur = 0; for(int i=0; i<n-1; i++) {
have += gas[cur] - cost[cur];
if(have >= 0) {
end ++;
cur = end;
}
else {
start --;
if(start < 0) {
start = n - 1;
}
cur = start;
}
} have += gas[cur] - cost[cur]; return have>=0?start:-1;
}
}
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