public static void main ( String [ ] args ) throws IOException {
  Reader reader = new Reader ( ) ;
  PrintWriter out = new PrintWriter ( System . out ) ;
  int n = reader . nextInt ( ) ;
  int [ ] arr = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  ++ i ) {
    arr [ i ] = reader . nextInt ( ) ;
  }
  int sum = 0 ;
  for ( int i = 0 ;
  i < n ;
  ++ i ) {
    sum += arr [ i ] ;
  }
  if ( sum == 0 ) {
    int sum1 = 0 ;
    int i = 0 ;
    while ( i < n ) {
      sum1 += arr [ i ] ;
      ++ i ;
      if ( sum1 != 0 ) {
        break ;
      }
    }
    if ( i == n ) {
      out . println ( "NO" ) ;
    }
    else {
      out . println ( "YES" ) ;
      out . println ( 2 ) ;
      out . println ( String . format ( "%d %d" , 1 , i ) ) ;
      out . println ( String . format ( "%d %d" , i + 1 , n ) ) ;
    }
  }
  else {
    out . println ( "YES" ) ;
    out . println ( 1 ) ;
    out . println ( String . format ( "%d %d" , 1 , n ) ) ;
  }
  reader . close ( ) ;
  out . close ( ) ;
}

public static void main ( String [ ] args ) throws IOException { Reader reader = new Reader ( ) ; PrintWriter out = new PrintWriter ( System . out ) ; int n = reader . nextInt ( ) ; int [ ] arr = new int [ n ] ; for ( int i = 0 ; i < n ; ++ i ) { arr [ i ] = reader . nextInt ( ) ; } int sum = 0 ; for ( int i = 0 ; i < n ; ++ i ) { sum += arr [ i ] ; } if ( sum == 0 ) { int sum1 = 0 ; int i = 0 ; while ( i < n ) { sum1 += arr [ i ] ; ++ i ; if ( sum1 != 0 ) { break ; } } if ( i == n ) { out . println ( " NO " ) ; } else { out . println ( " YES " ) ; out . println ( 2 ) ; out . println ( String . format ( " % d ▁ % d " , 1 , i ) ) ; out . println ( String . format ( " % d ▁ % d " , i + 1 , n ) ) ; } } else { out . println ( " YES " ) ; out . println ( 1 ) ; out . println ( String . format ( " % d ▁ % d " , 1 , n ) ) ; } reader . close ( ) ; out . close ( ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) (throws (type_identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list)))) (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))))) (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)))))) (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 (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))) (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) body: (block (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) (expression_statement (update_expression (identifier))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (break_statement))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal))))) alternative: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal) (decimal_integer_literal) (identifier)))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal) (binary_expression left: (identifier) right: (decimal_integer_literal)) (identifier))))))))) alternative: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal) (decimal_integer_literal) (identifier)))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))