Compilare: main.cpp: In function 'bool try_to_change(int, int)': main.cpp:14:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nod[pos].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp:20:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nod[pos].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:39:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<nod[i].size();j++) ~^~~~~~~~~~~~~~ main.cpp:47:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<nod[i].size();j++) ~^~~~~~~~~~~~~~