Compilare: user.cpp: In function ‘void bubble()’: user.cpp:60:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<sol.size()-1; i++) ^ user.cpp:61:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i; j<sol.size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:111:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for0(i,v[0].size()) ^ user.cpp:8:34: note: in definition of macro ‘for0’ #define for0(i,n) for(int i=0; i<n; i++) ^ user.cpp:122:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for0(i,sol.size()) ^ user.cpp:8:34: note: in definition of macro ‘for0’ #define for0(i,n) for(int i=0; i<n; i++) ^