Compilare: user.cpp: In function ‘int main()’: user.cpp:60:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, cr, nl, nc, s, nv, linie_vulpe, coloana_vulpe, raza_vulpe, ng, a, b, nod_de_plecare; ^ user.cpp:60:27: warning: unused variable ‘s’ [-Wunused-variable] int i, j, cr, nl, nc, s, nv, linie_vulpe, coloana_vulpe, raza_vulpe, ng, a, b, nod_de_plecare; ^ user.cpp: In function ‘void read(int&)’: user.cpp:45:136: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] while(buff[pos] < '0' || buff[pos] > '9'){if(buff[pos]== '-' )semn = -1; if(++pos == 200000) fread(buff, 1, 200000, stdin), pos = 0;} ^ user.cpp:47:139: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] while('0' <= buff[pos] && buff[pos] <= '9') {nr = nr * 10 + buff[pos] - '0';if(++pos == 200000) fread(buff, 1, 200000, stdin), pos = 0;} ^ user.cpp: In function ‘int main()’: user.cpp:109:25: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] v[b].push_back(i); ^