New Year Transportation
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#include <iostream>
#include <stdio.h>
using namespace std;
#define MAXN 33333
int num[MAXN];
int main()
{
int n, tar;
while(scanf("%d %d",&n, &tar) != EOF)
{
bool flag = false;
for( int i = 1; i < n; i++)
{
scanf("%d",&num[i]);
}
int res = 1;
while(1)
{
res = num[res] + res;
if(res == tar)
{
flag = true;
break;
}
else if(res >= n)
break;
}
if(flag)
printf("YES\n");
else
printf("NO\n");
}
return 0;
}
#include <stdio.h>
using namespace std;
#define MAXN 33333
int num[MAXN];
int main()
{
int n, tar;
while(scanf("%d %d",&n, &tar) != EOF)
{
bool flag = false;
for( int i = 1; i < n; i++)
{
scanf("%d",&num[i]);
}
int res = 1;
while(1)
{
res = num[res] + res;
if(res == tar)
{
flag = true;
break;
}
else if(res >= n)
break;
}
if(flag)
printf("YES\n");
else
printf("NO\n");
}
return 0;
}
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