Compilare: user.cpp: In function ‘int main()’: user.cpp:56:25: warning: unused variable ‘ok’ [-Wunused-variable] int i,j,st,dr,f,now,ok,nxt,mid,pos,vf,T; ^ user.cpp: In function ‘void Read32(int&)’: user.cpp:25:61: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++poz == DIM) fread(buff, 1, DIM, stdin), poz = 0; ^ user.cpp:29:61: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++poz == DIM) fread(buff, 1, DIM, stdin), poz = 0; ^ user.cpp: In function ‘void Read64(long long int&)’: user.cpp:37:61: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++poz == DIM) fread(buff, 1, DIM, stdin), poz = 0; ^ user.cpp:41:61: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++poz == DIM) fread(buff, 1, DIM, stdin), poz = 0; ^ user.cpp: In function ‘int main()’: user.cpp:53:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("atlas.in","r",stdin); ^ user.cpp:54:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("atlas.out","w",stdout); ^ user.cpp:104:55: warning: ‘pos’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(nev[ l[nxt] ] + 1LL * (pos - l[nxt]) * h[nxt] - (sum[pos] - sum[ l[nxt] ]) <= qnt) { st = mid + 1; f = nxt; } ^