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View Compilation Error

0_0_1510851_10046\Main.java:10: 找不到符号
符号: 变量 a
位置: 类 Main
			a=cin.nextInt();                  
                        ^
0_0_1510851_10046\Main.java:11: 找不到符号
符号: 变量 a
位置: 类 Main
			System.out.println(a*(a+1)/2);  
                                           ^
0_0_1510851_10046\Main.java:11: 找不到符号
符号: 变量 a
位置: 类 Main
			System.out.println(a*(a+1)/2);  
                                              ^
3 错误


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