Compilare: main.cpp: In function 'int main()': main.cpp:21:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<s.size();++j) ~^~~~~~~~~ main.cpp:24:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s.at(j)=='*' && j<s.size()) ~^~~~~~~~~ main.cpp:92:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<s.size();++j) ~^~~~~~~~~ main.cpp:100:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==s.size()) ~^~~~~~~~~~ main.cpp:103:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==s.size()) ~^~~~~~~~~~ main.cpp:120:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<s.size();++j) ~^~~~~~~~~ main.cpp:128:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==s.size()) ~^~~~~~~~~~ main.cpp:131:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==s.size()) ~^~~~~~~~~~