Find the Duplicate Number
双指针. 找环
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public class FloydsCycleDetection { public static int floyd(int[] a){ int s = a[0]; int f = a[0]; do { s = a[s]; f = a[a[f]]; } while (s!=f); s = a[0]; while (s != f){ s = a[s]; f = a[f]; } return f; } public static void main(String[] args) { int[] t = new int[]{1,3,4,2,2}; System.out.println(floyd(t)); } } |
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