Compilare: user.cpp: In function ‘int main()’: user.cpp:19:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j < min(a[i].size(), a[i-1].size()) && a[i][j] == a[i - 1][j]) ^ user.cpp:21:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j == a[i - 1].size())ans += (a[i].size() - a[i - 1].size()); ^