static int countTriangles ( int a [ ] , int n ) {
  int cnt = 0 ;
  int pairs = 0 ;
  for ( int i = n - 1 ;
  i >= 0 ;
  i -- ) {
    pairs += a [ i ] / 2 ;
    if ( a [ i ] % 2 == 1 && pairs > 0 ) {
      cnt += 1 ;
      pairs -= 1 ;
    }
  }
  cnt += ( 2 * pairs ) / 3 ;
  return cnt ;
}

static int countTriangles ( int a [ ] , int n ) { int cnt = 0 ; int pairs = 0 ; for ( int i = n - 1 ; i >= 0 ; i -- ) { pairs += a [ i ] / 2 ; if ( a [ i ] % 2 == 1 && pairs > 0 ) { cnt += 1 ; pairs -= 1 ; } } cnt += ( 2 * pairs ) / 3 ; return cnt ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (decimal_integer_literal)))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal)) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))) (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (parenthesized_expression (binary_expression left: (decimal_integer_literal) right: (identifier))) right: (decimal_integer_literal)))) (return_statement (identifier))))