/
Circular_tour.java
54 lines (50 loc) · 1.17 KB
/
Circular_tour.java
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// { Driver Code Starts
import java.util.*;
class First_Circular_tour {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
int t = sc.nextInt();
while (t > 0) {
int n = sc.nextInt();
sc.nextLine();
String str = sc.nextLine();
String arr[] = str.split(" ");
int p[] = new int[n];
int d[] = new int[n];
int j = 0;
int k = 0;
for (int i = 0; i < 2 * n; i++) {
if (i % 2 == 0) {
p[j] = Integer.parseInt(arr[i]);
j++;
} else {
d[k] = Integer.parseInt(arr[i]);
k++;
}
}
System.out.println(new Solution().tour(p, d));
t--;
}
}
}
class Solution {
int tour(int petrol[], int distance[]) {
int n = petrol.length;
if (n == 0)
return -1;
int extraFuel = 0, requiredFuel = 0;
int startingIndex = 0;
for (int i = 0; i < n; i++) {
extraFuel += petrol[i] - distance[i];
if (extraFuel < 0) {
requiredFuel += extraFuel;
startingIndex = i + 1;
extraFuel = 0;
}
}
if (extraFuel + requiredFuel >= 0) {
return startingIndex;
}
return -1;
}
}