0_0_6718465_12304.cpp: In function `char* rev(char*)':
0_0_6718465_12304.cpp:87: error: `strrev' undeclared (first use this function)
0_0_6718465_12304.cpp:87: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6718465_12304.cpp: In function `int main()':
0_0_6718465_12304.cpp:170: error: `strrev' undeclared (first use this function)
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