Compilare: main.cpp: In function 'int main()': main.cpp:45:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses] cin>>s[i]+1; ~~~~^~ main.cpp:72:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<edg[i].size();++j){ ~^~~~~~~~~~~~~~ main.cpp:74:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j+1 < edg[i].size() && edg[i][j+1].first == edg[i][j].first) ~~~~^~~~~~~~~~~~~~~