0_0_20706039_15118.cpp: In function 'int main()':
0_0_20706039_15118.cpp:62:30: error: 'memset' was not declared in this scope
memset(pre, 0, sizeof(pre));
^
0_0_20706039_15118.cpp:83:31: error: 'memset' was not declared in this scope
memset(pre, 0, sizeof(pre));
^
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