mxl.cpp: In function `int Formula(int)': mxl.cpp:34: warning: comparison between signed and unsigned integer expressions mxl.cpp:52:40: warning: multi-character character constant mxl.cpp:52: warning: comparison is always true due to limited range of data type mxl.cpp:55: warning: comparison between signed and unsigned integer expressions mxl.cpp:20: warning: unused variable `int sum' mxl.cpp: In function `void Solve()': mxl.cpp:72: warning: unused variable `int j'