http://poj.org/problem?id=3670 /* @author: */ import java.util.Scanner; import java.util.Arrays; public class Main{ static int mintwo(int a,int b){ return a< b?a:b; } static int minthird(int a,int b,int c){ int temp=mintwo(a,b); return mintwo(temp,c); } public static void main(String args[]){ Scanner sc=new Scanner(System.in); int f[][]=new int[30010][3]; int g[][]=new int[30010][3]; int v[]=new int[30010]; int n=sc.nextInt(); for(int i=1;i<=n;i++){ v[i]=sc.nextInt(); f[i][0]=f[i-1][0]; if(v[i]!=1) f[i][0]++; f[i][1]=mintwo(f[i-1][0],f[i-1][1]); if(v[i]!=2) f[i][1]++; f[i][2]=minthird(f[i-1][0],f[i-1][1],f[i-1][2]); if(v[i]!=3) f[i][2]++; } for(int i=1;i<=n;i++){ g[i][2]=g[i-1][2]; if(v[i]!=3) g[i][2]++; g[i][1]=mintwo(g[i-1][2],g[i-1][1]); if(v[i]!=2) g[i][1]++; g[i][0]=minthird(g[i-1][2],g[i-1][1],g[i-1][0]); if(v[i]!=1) g[i][0]++; } int mins=100000000; for(int i=0;i< 3;i++){ if(mins>f[n][i]) mins=f[n][i]; if(mins>g[n][i]) mins=g[n][i]; } System.out.printf("%dn",mins); } }
Meta
-
Recent Posts
Recent Comments
- MorrissMar on 隆宪叁年-五一
- MorrissMar on 隆宪叁年-五一
- MorrissMar on 隆宪叁年-五一
- bngvlttwnj on 隆宪叁年-五一
- bngvlttwnj on 隆宪叁年-五一
Archives
- May 2024
- April 2023
- February 2023
- January 2023
- December 2022
- November 2022
- September 2022
- June 2022
- July 2021
- January 2021
- February 2020
- September 2019
- March 2018
- February 2018
- August 2016
- July 2016
- June 2016
- May 2016
- April 2016
- March 2016
- February 2016
- January 2016
- December 2015
- November 2015
- October 2015
- September 2015
- August 2015
- July 2015
- June 2015
- May 2015
- April 2015
- March 2015
- February 2015
- January 2015
- December 2014
- November 2014
- October 2014
- September 2014
- August 2014
- July 2014
- June 2014
- May 2014
- April 2014
- March 2014
- February 2014
- January 2014
- December 2013
- November 2013
- October 2013
- September 2013
- August 2013
- July 2013
- June 2013
- May 2013
- April 2013
- March 2013
- February 2013
- January 2013
- December 2012
- November 2012
- October 2012
- September 2012
- August 2012
- July 2012
- June 2012
- May 2012
- April 2012
- March 2012
- February 2012
- January 2012
- December 2011
- November 2011
- October 2011
- September 2011
- August 2011
- July 2011
- June 2011
- May 2011
- April 2011
- March 2011
- February 2011
- January 2011
- December 2010
- November 2010
- October 2010
- September 2010
- August 2010
- July 2010
- June 2010
- May 2010
- April 2010
- March 2010
- February 2010
- January 2010
- December 2009
- November 2009
- October 2009
- September 2009
- August 2009
- July 2009
- June 2009
- May 2009
- April 2009
- March 2009
- February 2009
Categories