Compilare: user.cpp: In function ‘int abc(std::string, std::string)’: user.cpp:13:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:29:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s[i].str.length() == maxi) {cout << s[i].str;return 0;} ^ user.cpp:37:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < s[i].str.length()&& p < s[j].str.length();k++) ^ user.cpp:37:68: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < s[i].str.length()&& p < s[j].str.length();k++) ^ user.cpp:41:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p == s[j].str.length())s[j].b=0; ^