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View Compilation Error

0_0_30553488_20831.cpp: In function 'int main()':
0_0_30553488_20831.cpp:22:28: error: 'eular' was not declared in this scope
         ll sum2 = n*eular(n)/2;//按照这个公式可以知道所有的互质的数的和
                            ^


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