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-rw-r--r--other/gas_station.cpp25
1 files changed, 25 insertions, 0 deletions
diff --git a/other/gas_station.cpp b/other/gas_station.cpp
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+++ b/other/gas_station.cpp
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+#include "leetcode.h"
+
+class Solution {
+public:
+ int canCompleteCircuit(vector<int> &gas, vector<int> &cost) {
+ int n = gas.size(), totalSurplus = 0, surplus = 0, start = 0;
+ for (int i = 0; i < n; i++) {
+ totalSurplus += gas[i] - cost[i];
+ surplus += gas[i] - cost[i];
+ if (surplus < 0) {
+ surplus = 0;
+ start = i + 1;
+ }
+ }
+ return (totalSurplus < 0) ? -1 : start;
+ }
+};
+
+int main() {
+ Solution obj;
+ vector<int> gas1 = {1, 2, 3, 4, 5}, gas2 = {2, 3, 4}, cost1 = {3, 4, 5, 1, 2},
+ cost2 = {3, 4, 3};
+ cout << obj.canCompleteCircuit(gas1, cost1) << endl; // expect: 3
+ cout << obj.canCompleteCircuit(gas2, cost1) << endl; // expect: -1
+}