Compilare: main.cpp: In function 'int main()': main.cpp:16:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<a.size();i++) ~^~~~~~~~~ main.cpp:25:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<b.size();i++) ~^~~~~~~~~ main.cpp:10:15: warning: variable 'm' set but not used [-Wunused-but-set-variable] int l=0,n,m,cnt=0,r=0,c2=0; ^