Compilare: user.cpp: In function ‘int main()’: user.cpp:25:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j>=s[i].size() || j>=s[i-1].size()) ~^~~~~~~~~~~~~ user.cpp:25:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j>=s[i].size() || j>=s[i-1].size()) ~^~~~~~~~~~~~~~~