【PAT甲级 - C++题解】1069 The Black Hole of Numbers
1069 The Black Hole of NumbersFor any 4-digit integer except the ones with all the digits being the same, if we sort the digits in non-increasing order first, and then in non-decreasing order, a new ....
【PAT甲级 - C++题解】1120 Friend Numbers
1120 Friend NumbersTwo integers are called “friend numbers” if they share the same sum of their digits, and the sum is their “friend ID”. For example, 123 and 51 are friend numbers since 1+2+3 = 5+1 ....
【PAT甲级 - C++题解】1023 Have Fun with Numbers
1023 Have Fun with NumbersNotice that the number 123456789 is a 9-digit number consisting exactly the numbers from 1 to 9, with no duplication. Double it we will obtain 246913578, which happens to be....
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