Compilare: user.cpp: In function ‘void solve()’: user.cpp:213:9: warning: unused variable ‘j’ [-Wunused-variable] int j, h; ^ user.cpp:214:9: warning: unused variable ‘cost’ [-Wunused-variable] int cost; ^ user.cpp: In function ‘void refillBuff()’: user.cpp:46:32: 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, buffSize, f); ^ user.cpp: In function ‘void solve()’: user.cpp:242:29: warning: ‘mid3’ may be used uninitialized in this function [-Wmaybe-uninitialized] cmp(h, mid3); ^ user.cpp:237:29: warning: ‘mid2’ may be used uninitialized in this function [-Wmaybe-uninitialized] cmp(h, mid2); ^