Compilare: user.cpp: In function ‘int main()’: user.cpp:7:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("elmaj.in", "r", stdin); ^ user.cpp:8:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("elmaj.out", "w", stdout); ^ user.cpp:12:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(inBuffer, 0x1, 0x1000000, stdin); ^ user.cpp:36:9: warning: ‘candidate’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(x == candidate) ++unpaired; ^~ user.cpp:47:14: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] v[i] = x; ~~~~~^~~