Compilare: main.cpp: In function 'std::__cxx11::string merge_string(int, int)': main.cpp:34:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(poz1<s1.size()&&poz2<s2.size()) ~~~~^~~~~~~~~~ main.cpp:34:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(poz1<s1.size()&&poz2<s2.size()) ~~~~^~~~~~~~~~ main.cpp:38:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(val==s3.size()+1+s2.size()-poz2) ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:43:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(poz1<s1.size()) s3.push_back(s1[poz1++]); ~~~~^~~~~~~~~~ main.cpp:44:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(poz1<s2.size()) s3.push_back(s2[poz2++]); ~~~~^~~~~~~~~~