Compilare: main.cpp: In function 'int main()': main.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(V[i].size()<minsz) ~~~~~~~~~~~^~~~~~ main.cpp:51:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(V[val].size()==minsz) ~~~~~~~~~~~~~^~~~~~~ main.cpp:70:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(V[R[l][c]].size()==minsz) ~~~~~~~~~~~~~~~~~^~~~~~~