摘要：https://www.youtube.com/watch?v=wnYtITkWAYA A planar graph is a graph that can be drawn in the plane without any edge crossings. A plane graph is a pl 阅读全文

摘要：In mathematics and computer science, the pigeonhole principle states that if n items are put into m pigeonholes with n > m, then at least one pigeonho 阅读全文

摘要：There is an array of 1001 elements which range from 1 to 1000. Only one element is repeated in the array while the others exist only once in the array 阅读全文

摘要：XOR operator https://www.baeldung.com/java-xor-operator 阅读全文