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// Simple C++ program to print 
// next greater elements in a 
// given array 
#include<iostream> 
using namespace std; 

/* prints element and NGE pair 
for all elements of arr[] of size n */
void printNGE(int arr[], int n) 
{ 
	int next, i, j; 
	for (i = 0; i < n; i++) 
	{ 
		next = -1; 
		for (j = i + 1; j < n; j++) 
		{ 
			if (arr[i] < arr[j]) 
			{ 
				next = arr[j]; 
				break; 
			} 
		} 
		cout << arr[i] << " -- "
			<< next << endl; 
	} 
} 

// Driver Code 
int main() 
{ 
	int arr[] = {11, 13, 21, 3}; 
	int n = sizeof(arr)/sizeof(arr[0]); 
	printNGE(arr, n); 
	return 0; 
} 

// This code is contributed 
// by Akanksha Rai(Abby_akku)