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

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