C++程式中每個輻射站的最終輻射
假設在直線上有N個站點。每個站點具有相同的非負輻射功率。每個站點都可以透過以下方式增加其相鄰站點的輻射功率。
假設輻射功率為R的站點i將把(i – 1)站點的輻射功率增加R-1,(i - 2)站點的輻射功率增加R-2,並將(i + 1)站點的輻射功率增加R-1,(i + 2)站點的輻射功率增加R-2,以此類推。例如,如果陣列為Arr = [1, 2, 3],則輸出將為3, 4, 4。新的輻射將為[1 + (2 – 1) + (3 - 2), 2 + (1 – 1) + (3 - 1), 3 + (2 – 1)] = [3, 4, 4]
思路很簡單。對於每個站點i,都會增加相鄰站點的輻射,直到有效輻射變為負數。
示例
#include <iostream>
using namespace std;
class pump {
public:
int petrol;
int distance;
};
int findStartIndex(pump pumpQueue[], int n) {
int start_point = 0;
int end_point = 1;
int curr_petrol = pumpQueue[start_point].petrol - pumpQueue[start_point].distance;
while (end_point != start_point || curr_petrol < 0) {
while (curr_petrol < 0 && start_point != end_point) {
curr_petrol -= pumpQueue[start_point].petrol - pumpQueue[start_point].distance;
start_point = (start_point + 1) % n;
if (start_point == 0)
return -1;
}
curr_petrol += pumpQueue[end_point].petrol - pumpQueue[end_point].distance;
end_point = (end_point + 1) % n;
}
return start_point;
}
int main() {
pump PumpArray[] = {{4, 6}, {6, 5}, {7, 3}, {4, 5}};
int n = sizeof(PumpArray)/sizeof(PumpArray[0]);
int start = findStartIndex(PumpArray, n);
if(start == -1)
cout<<"No solution";
else
cout<<"Index of first petrol pump : "<<start;
}輸出
Index of first petrol pump : 1
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