Compilare: user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:21:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^ user.cpp: In function ‘int main()’: user.cpp:101:27: warning: ‘sol2’ may be used uninitialized in this function [-Wmaybe-uninitialized] write_ch(vu32 % 10 + '0'); ^ user.cpp:130:33: note: ‘sol2’ was declared here int K, k, left, right, mid, sol2, i, j; ^