Count of index pairs with equal elements in an array | Java program to count of pairs with equal elements in an array . ; Return the number of pairs with equal values . ; for each index i and j ; finding the index with same value but different index . ; driver code
class GFG { static int countPairs ( int arr [ ] , int n ) { int ans = 0 ; for ( int i = 0 ; i < n ; i ++ ) for ( int j = i + 1 ; j < n ; j ++ ) if ( arr [ i ] == arr [ j ] ) ans ++ ; return ans ; } public static void main ( String [ ] args ) { int arr [ ] = { 1 , 1 , 2 } ; int n = arr . length ; System . out . println ( countPairs ( arr , n ) ) ; } }