public static void main ( String [ ] args ) {
  n = in . nextInt ( ) ;
  m = in . nextInt ( ) ;
  ArrayList < Integer > blocksN = new ArrayList < Integer > ( ) ;
  ArrayList < Integer > blocksM = new ArrayList < Integer > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) blocksN . add ( in . nextInt ( ) ) ;
  for ( int i = 0 ;
  i < m ;
  i ++ ) blocksM . add ( in . nextInt ( ) ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    target += blocksN . get ( i ) ;
    while ( sum < target ) {
      sum += blocksM . get ( j ) ;
      j ++ ;
    }
    if ( sum == target ) {
      target = sum = 0 ;
      files ++ ;
    }
  }
  System . out . println ( files ) ;
}

public static void main ( String [ ] args ) { n = in . nextInt ( ) ; m = in . nextInt ( ) ; ArrayList < Integer > blocksN = new ArrayList < Integer > ( ) ; ArrayList < Integer > blocksM = new ArrayList < Integer > ( ) ; for ( int i = 0 ; i < n ; i ++ ) blocksN . add ( in . nextInt ( ) ) ; for ( int i = 0 ; i < m ; i ++ ) blocksM . add ( in . nextInt ( ) ) ; for ( int i = 0 ; i < n ; i ++ ) { target += blocksN . get ( i ) ; while ( sum < target ) { sum += blocksM . get ( j ) ; j ++ ; } if ( sum == target ) { target = sum = 0 ; files ++ ; } } System . out . println ( files ) ; }
(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 (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier))) arguments: (argument_list)))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier))) arguments: (argument_list)))) (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: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (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: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (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: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) body: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (expression_statement (update_expression (identifier))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (assignment_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (update_expression (identifier))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))