public static void main ( String [ ] args ) {
  Scanner scan = new Scanner ( System . in ) ;
  int n = scan . nextInt ( ) ;
  int [ ] a = new int [ n ] ;
  int sum = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    a [ i ] = scan . nextInt ( ) ;
    sum += a [ i ] ;
  }
  if ( sum != 0 ) {
    System . out . println ( "YES\n" + 1 + "\n" + 1 + " " + n ) ;
  }
  else if ( n == 1 ) System . out . println ( "NO" ) ;
  else {
    int summ = 0 ;
    int j ;
    for ( j = 0 ;
    j < n ;
    j ++ ) {
      summ += a [ j ] ;
      if ( summ != 0 ) break ;
    }
    if ( j == n ) System . out . println ( "NO" ) ;
    else System . out . println ( "YES\n" + 2 + "\n" + 1 + " " + ( j + 1 ) + "\n" + ( j + 2 ) + " " + n ) ;
  }
}

public static void main ( String [ ] args ) { Scanner scan = new Scanner ( System . in ) ; int n = scan . nextInt ( ) ; int [ ] a = new int [ n ] ; int sum = 0 ; for ( int i = 0 ; i < n ; i ++ ) { a [ i ] = scan . nextInt ( ) ; sum += a [ i ] ; } if ( sum != 0 ) { System . out . println ( " YES \n " + 1 + " \n " + 1 + " ▁ " + n ) ; } else if ( n == 1 ) System . out . println ( " NO " ) ; else { int summ = 0 ; int j ; for ( j = 0 ; j < n ; j ++ ) { summ += a [ j ] ; if ( summ != 0 ) break ; } if ( j == n ) System . out . println ( " NO " ) ; else System . out . println ( " YES \n " + 2 + " \n " + 1 + " ▁ " + ( j + 1 ) + " \n " + ( j + 2 ) + " ▁ " + n ) ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (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: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (string_literal) right: (decimal_integer_literal)) right: (string_literal)) right: (decimal_integer_literal)) right: (string_literal)) right: (identifier)))))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) alternative: (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))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (break_statement)))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) alternative: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (string_literal) right: (decimal_integer_literal)) right: (string_literal)) right: (decimal_integer_literal)) right: (string_literal)) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (string_literal)) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (string_literal)) right: (identifier)))))))))))