Compilare: main.cpp: In function 'int lcs(std::__cxx11::string, std::__cxx11::string)': main.cpp:12:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=x.size();++i) dp[i][0]=0; ~^~~~~~~~~~ main.cpp:13:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<=y.size();++j) dp[0][j]=0; ~^~~~~~~~~~ main.cpp:14:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<x.size();++i){ ~^~~~~~~~~ main.cpp:15:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<y.size();++j){ ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:28:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<v.size();++i){ ~^~~~~~~~~