Compilare: user.cpp:111:28: warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings] ofbuffer fout("sumdiv2.out"); ^ 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); ^ user.cpp: In function ‘int main()’: user.cpp:131:39: warning: iteration 1000004 invokes undefined behavior [-Waggressive-loop-optimizations] aux[i] = aux[i - 1] + sumdiv[i]; ~~~~~~~~^ user.cpp:129:19: note: within this loop for (i = 1; i <= 1000005; ++i) ~~^~~~~~~~~~