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View Compilation Error

0_0_12930495_21738\Main.java:13: 已在 main(java.lang.String[]) 中定义 b
            int b=a-7;
                ^
0_0_12930495_21738\Main.java:15: 找不到符号
符号: 变量 p
位置: 类 Main
            int sum=p*q/2;
                    ^
0_0_12930495_21738\Main.java:15: 找不到符号
符号: 变量 q
位置: 类 Main
            int sum=p*q/2;
                      ^
0_0_12930495_21738\Main.java:19: 找不到符号
符号: 变量 m
位置: 类 Main
            if(c==0){                    sum=n*m-sum;
                                               ^
4 错误


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