Compilare: user.cpp: In function ‘int main()’: user.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j>=str[i].size() || j>=str[i-1].size()) ~^~~~~~~~~~~~~~~ user.cpp:24:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j>=str[i].size() || j>=str[i-1].size()) ~^~~~~~~~~~~~~~~~~