Compilare: main.cpp: In function 'void inser(std::__cxx11::string)': main.cpp:46:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s1.size();i++){ ~^~~~~~~~~~ main.cpp:54:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==s1.size()-1) vecc[curr].val++; ~^~~~~~~~~~~~~ main.cpp: In function 'void delet(std::__cxx11::string)': main.cpp:61:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s1.size();i++){ ~^~~~~~~~~~ main.cpp:65:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==s1.size()-1) vecc[curr].val--; ~^~~~~~~~~~~~~ main.cpp: In function 'void ans(std::__cxx11::string)': main.cpp:71:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s1.size();i++){ ~^~~~~~~~~~ main.cpp:74:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==s1.size()-1) fout << vecc[curr].val << '\n'; ~^~~~~~~~~~~~~ main.cpp: In function 'void ans2(std::__cxx11::string)': main.cpp:80:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s1.size();i++){ ~^~~~~~~~~~