Compilare: user.cpp: In function ‘int solve()’: user.cpp:123: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:124: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:125: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:128: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In member function ‘long long int cuckooHash<Type, table_size>::hash(random_function<table_size>, Type) [with Type = char [], int table_size = 1000005]’: user.cpp:57: warning: ‘c’ may be used uninitialized in this function In file included from /usr/include/string.h:640, from user.cpp:3: In function ‘void* memset(void*, int, size_t)’, inlined from ‘int solve()’ at user.cpp:43: /usr/include/bits/string3.h:83: warning: call to ‘__warn_memset_zero_len’ declared with attribute warning: memset used with constant zero length parameter; this could be due to transposed parameters /tmp/ccz8PL0z.o: In function `solve()': user.cpp:(.text+0x21d): warning: memset used with constant zero length parameter; this could be due to transposed parameters