Compilare: user.cpp:111:28: warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings] ofbuffer fout("sumdiv2.out"); ^ user.cpp: In function ‘int main()’: user.cpp:120:23: warning: unused variable ‘sol’ [-Wunused-variable] int i, n, st, dr, sol, j; ^~~ user.cpp: In member function ‘void InputReader::adv()’: user.cpp:25:54: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, sizeof(char), BUFF_SIZE, fin); ^