Compilare: main.cpp: In function 'int main()': main.cpp:57:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<con[k].size();i++) ~^~~~~~~~~~~~~~ main.cpp:78:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<con[i].size();j++) ~^~~~~~~~~~~~~~ main.cpp:127:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<r.size()-1;i=i+2) ~^~~~~~~~~~~