G++: I have not change my program logic and solved TLE and WA.
WA:
	1. When using integer representing phone number, not present leading zero.
		Test case:
		4
		0000000
		0000000
		0011001
		0011001
	2. "No duplicates."
		Test case:
		1
		0000000
TLE:
	1. Do not use map<string, int> or set<> to store phone book.
	2. I/O is significant. Try using printf/scanf not cout/cin.
	3. String processing is significant. Do not use istringstream/ostringstream even string, use char* instead.
	4. Check your alg first in (finding and sorting), then in (inserting and deleting). Their complexity and Times invoked is crucial.