通过提交C语言程序，逐字符确定测试用例。为符合编程人员的习惯，字符默认从第0个开始。文本框中输入Enter键可以直接开始探测。在结束文本框输入非数字时，会持续探测。探测到所有的测试用例都EOF时探测会结束。支持的测试用例字符：ASCII -1, 8-13, 32-126。
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