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View Compilation Error

0_0_36748712_6771\Main.java:24: 错误: 找不到符号
            if(s1.charAt(0)=='-') a1*=-1;
                                  ^
  符号:   变量 a1
  位置: 类 Main
0_0_36748712_6771\Main.java:33: 错误: 找不到符号
            if(s2.charAt(0)=='-') a2*=-1;
                                  ^
  符号:   变量 a2
  位置: 类 Main
2 个错误


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