Compilare: user.cpp: In function ‘int main()’: user.cpp:18:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i < target.size(); i ++) { ~~^~~~~~~~~~~~~~~ user.cpp:27:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < s.size(); i ++) { ~~^~~~~~~~~~ user.cpp:32:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k == target.size() - 1) { ~~^~~~~~~~~~~~~~~~~~~~ user.cpp:39:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sol.size(); i ++) ~~^~~~~~~~~~~~