http://poj.org/problem?id=2751 /* @author: */ import java.util.Scanner; public class Main { static int a[][]=new int[10001][2]; static int b[][]=new int[10001][2]; static int an,bn; static void sort(){ int i,j,t1,t2; for(i=0;i< an;i++) for(j=0;j< an;j++) { if(a[i][0]< a[j][0]) { t1=a[i][0];t2=a[i][1]; a[i][0]=a[j][0];a[i][1]=a[j][1]; a[j][0]=t1;a[j][1]=t2; } } for(i=0;i< bn;i++) for(j=0;j< bn;j++) { if(b[i][1]>b[j][1]) { t1=b[i][0];t2=b[i][1]; b[i][0]=b[j][0];b[i][1]=b[j][1]; b[j][0]=t1;b[j][1]=t2; } } } public static void main(String[] args) { Scanner sc = new Scanner(System.in); int i,j,cn,t1,t2,l1,l2,sum1,sum2; while(sc.hasNext()){ cn=sc.nextInt(); if(cn==0) break; an=0;bn=0; for(i=0;i< cn;i++) { t1=sc.nextInt(); t2=sc.nextInt(); if(t1<=t2) { a[an][0]=t1;a[an][1]=t2; an++; } else { b[bn][0]=t1;b[bn][1]=t2; bn++; } } sort(); for(i=0;i< bn;i++) { a[an][0]=b[i][0];a[an][1]=b[i][1]; an++; } l1=l2=0;sum1=sum2=0; for(i=0;i< an;i++) { sum1+=a[i][0]; if(sum1>sum2)sum2=sum1; sum2+=a[i][1]; } System.out.printf("%dn",sum2); } } }
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