0_0_17664505_27445.cpp: In function 'int main()':
0_0_17664505_27445.cpp:19:24: error: 'strlen' was not declared in this scope
int aa = strlen(a + 1);
^
0_0_17664505_27445.cpp:22:29: error: 'memset' was not declared in this scope
memset(pre, 0, sizeof(pre));
^
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