public static void main ( String [ ] args ) throws IOException {
  MyScanner s = new MyScanner ( ) ;
  Print p = new Print ( ) ;
  int t = s . nextInt ( ) ;
  while ( t -- > 0 ) {
    int n = s . nextInt ( ) ;
    int [ ] arr = new int [ n ] ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) arr [ i ] = s . nextInt ( ) ;
    int sum = 0 ;
    for ( int i = 0 ;
    i < n - 1 ;
    i ++ ) {
      sum += Math . max ( 0 , arr [ i ] - arr [ i + 1 ] ) ;
    }
    if ( sum <= arr [ 0 ] ) p . println ( "YES" ) ;
    else p . println ( "NO" ) ;
  }
  p . close ( ) ;
}

public static void main ( String [ ] args ) throws IOException { MyScanner s = new MyScanner ( ) ; Print p = new Print ( ) ; int t = s . nextInt ( ) ; while ( t -- > 0 ) { int n = s . nextInt ( ) ; int [ ] arr = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) arr [ i ] = s . nextInt ( ) ; int sum = 0 ; for ( int i = 0 ; i < n - 1 ; i ++ ) { sum += Math . max ( 0 , arr [ i ] - arr [ i + 1 ] ) ; } if ( sum <= arr [ 0 ] ) p . println ( " YES " ) ; else p . println ( " NO " ) ; } p . 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)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (while_statement condition: (parenthesized_expression (binary_expression left: (update_expression (identifier)) right: (decimal_integer_literal))) body: (block (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: (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: (binary_expression left: (identifier) right: (decimal_integer_literal))) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal)))))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (array_access array: (identifier) index: (decimal_integer_literal)))) consequence: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal)))) alternative: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))