# include<stdio.h>
# include<iostream>
# include<string.h>
using namespace std;
int a[110000][12];
inline int Input()
{
int res=0,f=1,c;
while(!isdigit(c = getchar()) && c!='-');
c=='-' ? f=0 : res=c-'0';
while(isdigit(c = getchar()))
res = res*10 + c-'0';
return f ? res : -res;
}
int max1(int x,int y)
{
return x>y?x:y;
}
int max(int a,int b,int c)
{
if(a>b)
b=a;
if(c>b)
b=c;
return b;
}
int main()
{
int n,i,j,x,y,m;
while(scanf("%d",&n)&&n)
{
memset(a,0,sizeof(a));
m=0;
for(i=0;i<n;i++)
{
x=Input();
y=Input();
a[y][x]++;
if(y>m)
m=y;
}
for(i=m;i>0;i--)
for(j=0;j<11;j++)
{
if(j==0)
a[i-1][j]+=max1(a[i][j],a[i][j+1]);
else if(j==10)
a[i-1][j]+=max1(a[i][j],a[i][j-1]);
else
a[i-1][j]+=max(a[i][j-1],a[i][j],a[i][j+1]);
}
printf("%d\n",a[0][5]);
}
return 0;
}
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最新推荐文章于 2018-09-21 14:15:06 发布