#Me too!
```cpp
#include<bits/stdc++.h>
using namespace std;
int x[51][200010];
int a[200010],b[200010];
int f[200010];
int n,k,p;
inline void read(int &x)
{
x=0;
char ch=getchar();
while(ch<'0'||ch>'9')ch=getchar();
while(ch>='0'&&ch<='9')x=x*10+(ch^48),ch=getchar();
}
int main()
{
read(n),read(k),read(p);
int mini=2147483647,maxi=0;
for(int i=1;i<=n;++i)read(a[i]),read(b[i]),mini=min(mini,a[i]),maxi=max(maxi,a[i]);
for(int i=1;i<=n;++i)x[a[i]][++x[a[i]][0]]=i;
for(int i=1;i<=n;++i)
if(b[i]<=p)f[i]=f[i-1]+1;
else f[i]=f[i-1];
long long ans=0;
for(int i=mini;i<=maxi;++i)
for(int j=1;j<x[i][0];++j)
for(int s=j+1;s<=x[i][0];++s)
if(f[x[i][s]]>f[x[i][j]-1])ans++;
printf("%lld",ans);
return 0;
}
```
by qianfujia @ 2017-12-07 20:30:27
#手开O2（滑稽）
```cpp
#include<bits/stdc++.h>
#pragma GCC optimize(2)
using namespace std;
long long x[51][200010];
long long a[200010],b[200010];
long long f[200010];
long long n,k,p;
inline void read(long long &x)
{
x=0;
char ch=getchar();
while(ch<'0'||ch>'9')ch=getchar();
while(ch>='0'&&ch<='9')x=x*10+(ch^48),ch=getchar();
}
int main()
{
read(n),read(k),read(p);
long long mini=2147483647,maxi=0;
for(long long i=1;i<=n;++i)read(a[i]),read(b[i]),mini=min(mini,a[i]),maxi=max(maxi,a[i]);
for(long long i=1;i<=n;++i)x[a[i]][++x[a[i]][0]]=i;
for(long long i=1;i<=n;++i)
if(b[i]<=p)f[i]=f[i-1]+1;
else f[i]=f[i-1];
long long ans=0;
for(long long i=mini;i<=maxi;++i)
for(long long j=1;j<x[i][0];++j)
for(long long s=j+1;s<=x[i][0];++s)
if(f[x[i][s]]>f[x[i][j]-1])ans++;
printf("%lld",ans);
return 0;
}
```
by qianfujia @ 2017-12-07 20:41:31