Compilare: main.cpp: In function 'void df(int)': main.cpp:19:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[x].size(); i++) ~^~~~~~~~~~~~ main.cpp: In function 'int findnod(int)': main.cpp:26:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<b[x].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:54:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<b[i].size();j++) ~^~~~~~~~~~~~ main.cpp:60:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<c.size();i++) ~^~~~~~~~~ main.cpp: In function 'int findnod(int)': main.cpp:28:20: warning: 'poz' may be used uninitialized in this function [-Wmaybe-uninitialized] return b[x][poz]; ^