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@echo Off & SetLocal EnableDelayedExpansion set "szResult=" set /p "var=Input: " For /L %%a in (0 1 31) do ( set /a n = 1"<<"%%a, m = var "&" n If !m! equ !n! set "szResult=!szResult!+!n!" ) If defined szResult Echo %szResult:~1% Pause复制代码