Compilare: user.cpp: In function ‘void do_stuff(int)’: user.cpp:31:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<li[i].size();j++) ^ user.cpp:32:47: warning: array subscript has type ‘char’ [-Wchar-subscripts] T[li[i][j].ind]+=dist[li[ i ][ j ].beg]*(1-B)+dist[li[ i ][ j ].en]*B; ^ user.cpp:32:75: warning: array subscript has type ‘char’ [-Wchar-subscripts] T[li[i][j].ind]+=dist[li[ i ][ j ].beg]*(1-B)+dist[li[ i ][ j ].en]*B; ^ user.cpp: In function ‘void divide(int, int)’: user.cpp:64:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<li[i].size();j++) ^ user.cpp:71:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<li[i].size();j++) ^