Compilare: main.cpp: In function 'int main()': main.cpp:13:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<A.size();i++){ ~^~~~~~~~~ main.cpp:16:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i+j<A.size() && A[i+j]==A[j]){ ~~~^~~~~~~~~ main.cpp:17:13: warning: operation on 'j' may be undefined [-Wsequence-point] Pa[i+j]=++j; ^~~ main.cpp:23:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<B.size()){ ~^~~~~~~~~ main.cpp:24:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<A.size() && i<B.size() && A[j]==B[i]){ ~^~~~~~~~~ main.cpp:24:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<A.size() && i<B.size() && A[j]==B[i]){ ~^~~~~~~~~ main.cpp:28:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==A.size()){ ~^~~~~~~~~~ main.cpp:31:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] }else if(i<B.size()){ ~^~~~~~~~~ main.cpp:37:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<P.size();i++)cout<<P[i]<<' '; ~^~~~~~~~~