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| #include <cstdio>
#include <iostream>
#include <algorithm>
#define maxN 1000010
using namespace std;
struct Tree{ int max, tag; } a[maxN << 2];
int p[maxN], q[maxN];
bool cmp (int x, int y)
{
return x > y;
}
int Max (int x, int y)
{
return x > y ? x : y;
}
void pushdown (int now, int l, int r)
{
if(a[now].tag)
{
a[now << 1].max -= a[now].tag;
a[now << 1 | 1].max -= a[now].tag;
a[now << 1].tag += a[now].tag;
a[now << 1 | 1].tag += a[now].tag;
a[now].tag = 0;
}
}
void change (int now, int l, int r, int x, int t)
{
pushdown(now, l, r);
if(l == r)
{
a[now].max = t;
return ;
}
int mid = (l + r) >> 1;
if(x <= mid)
{
change(now << 1, l, mid, x, t);
}
else
{
change(now << 1 | 1, mid + 1, r, x, t);
}
a[now].max = Max(a[now << 1].max, a[now << 1 | 1].max);
}
int query (int now, int l, int r, int L, int R)
{
pushdown(now, l, r);
if(l == L && r == R)
{
return a[now].max;
}
int mid = (l + r) >> 1;
if(R <= mid)
{
return query(now << 1, l, mid, L, R);
}
else if(mid + 1 <= L)
{
return query(now << 1 | 1, mid + 1, r, L, R);
}
else
{
int A = query(now << 1, l, mid, L, mid);
int B = query(now << 1 | 1, mid + 1, r, mid + 1, R);
return Max(A, B);
}
}
void Minus (int now, int l, int r, int L, int R)
{
if(l == L && r == R)
{
a[now].max--;
a[now].tag += 1;
return ;
}
pushdown(now, l, r);
int mid = (l + r) >> 1;
if(R <= mid)
{
Minus(now << 1, l, mid, L, R);
}
else if(mid + 1 <= L)
{
Minus(now << 1 | 1, mid + 1, r, L, R);
}
else
{
Minus(now << 1, l, mid, L, mid);
Minus(now << 1 | 1, mid + 1, r, mid + 1, R);
}
a[now].max = Max(a[now << 1].max, a[now << 1 | 1].max);
}
int main ()
{
int n = 0, m = 0;
scanf("%d %d", &n, &m);
for(int i = 1;i <= n; i++)
{
scanf("%d", &p[i]);
}
sort(p + 1, p + n + 1, cmp);
for(int i = 1;i <= n; i++)
{
change(1, 1, n, i, p[i]);
}
bool flag = false;
for(int i = 1;i <= m; i++)
{
int x = 0;
scanf("%d", &x);
int C = query(1, 1, n, x, x);
if(!C)
{
flag = true;
printf("%d", i - 1);
break;
}
int L = 0, R = 0;
int l = 1, r = n;
while(l < r)
{
int mid = (l + r + 1) >> 1;
if(query(1, 1, n, mid, n) >= C)
{
l = mid;
}
else
{
r = mid - 1;
}
}
R = l;
l = 1, r = n;
while(l < r)
{
int mid = (l + r) >> 1;
if(query(1, 1, n, mid, n) > C)
{
l = mid + 1;
}
else
{
r = mid;
}
}
L = l;
int len = x - (L - 1);
if(L > 1)
{
Minus(1, 1, n, 1, L - 1);
}
Minus(1, 1, n, R - len + 1, R);
}
if(!flag)
{
printf("%d", m);
}
return 0;
}
|