#include <stdio.h>
int n;
long long m;
long long a[1000005];
int main()
{
a[0]=0;
int i, l=0, ans=n+1;
for (i=1; i<=n; ++i)
{
a[i]+=a[i-1];
}
for (i=1; i<=n; ++i)
{
while (a[i]-a[l]>=m && i >= l)
{
if (ans > i-l) ans=i-l;
++l;
}
}
if (ans
>1) printf("%d", ans
-1); }
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