Compilare: user.cpp: In function ‘int main()’: user.cpp:19:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<sir.size();j++) ~^~~~~~~~~~~ user.cpp:23:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int g=j;g<sir.size();g++) ~^~~~~~~~~~~ user.cpp:40:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<=sir.size()/2;k++) ~^~~~~~~~~~~~~~