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:27:14: 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:55:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<b[i].size();j++) ~^~~~~~~~~~~~ main.cpp:61:14: 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:29:20: warning: 'poz' may be used uninitialized in this function [-Wmaybe-uninitialized] return b[x][poz]; ^ main.cpp: In function 'int main()': main.cpp:29:20: warning: 'poz' may be used uninitialized in this function [-Wmaybe-uninitialized] return b[x][poz]; ^ main.cpp:26:17: note: 'poz' was declared here int minim=2,poz; ^~~