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View Compilation Error

0_0_13072775_22443\Main.java:14: 找不到符号
符号: 变量 sum
位置: 类 Main
                sum = s + (m - 1) * s / 2;
                ^
0_0_13072775_22443\Main.java:15: 找不到符号
符号: 变量 sum
位置: 类 Main
                System.out.println(sum);
                                   ^
2 错误


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