Compilare: main.cpp: In function 'int ed(std::__cxx11::string&, std::__cxx11::string&)': main.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=s1.size();++i) ~^~~~~~~~~~~ main.cpp:23:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=s2.size();++i) ~^~~~~~~~~~~ main.cpp:29:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=s1.size();++i) ~^~~~~~~~~~~ main.cpp:31:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=s2.size();++j) ~^~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:59:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<t.size();++i){ ~^~~~~~~~~ main.cpp:61:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1; j<t.size();++j){ ~^~~~~~~~~