foo.cpp: In function 'int main()':
foo.cpp:57:40: warning: array subscript has type 'char' [-Wchar-subscripts]
       up(f[i][j+k+M],f[i-1][j+M]+h[a[i]][b[i]][k+14]);
                                        ^
foo.cpp:57:46: warning: array subscript has type 'char' [-Wchar-subscripts]
       up(f[i][j+k+M],f[i-1][j+M]+h[a[i]][b[i]][k+14]);
                                              ^