Compilare: user.cpp: In member function ‘void InputReader::adv()’: user.cpp:24:54: 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 solve(int, int)’: user.cpp:90:21: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (mat[l][c] < mat[x][y]) ~~~~~~~~^