Eroare de compilare: user.cpp: In function ‘void read()’: user.cpp:21:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<a.size(); i++) ^ user.cpp: In function ‘void solve()’: user.cpp:40:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<a.size(); i++) ^ user.cpp:42:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=i+1; j<a.size(); j++) ^ user.cpp: At global scope: user.cpp:51:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() ^ user.cpp: In function ‘int main()’: user.cpp:54:30: error: ‘sort’ was not declared in this scope sort(a.begin(),a.end(),xx); ^