Compilare: user.cpp: In function ‘int main()’: user.cpp:20:15: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] fin>>f+1; ^ user.cpp:58:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<co[i].size();j++) ^ user.cpp:59:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] sor[co[i][j].a].push_back(co[i][j]); ^ user.cpp:62:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<sor[i].size();j++) ^