# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
743109 | bgnbvnbv | Zoltan (COCI16_zoltan) | C++14 | 30 ms | 3664 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
#define TASKNAME "codeforce"
#define pb push_back
#define pli pair<int,int>
#define fi first
#define se second
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL);
using namespace std;
using ll=long long;
const ll maxN=2e5;
const ll inf=1e18;
const ll mod=1e9+7;
ll n,a[maxN],b[maxN],dp[maxN][2],cnt[maxN][2];
ll pw(ll x,ll y)
{
if(y==0) return 1;
ll x1=pw(x,y/2);
x1=x1*x1%mod;
if(y&1) x1=x1*x%mod;
return x1;
}
void solve()
{
cin >> n;
for(int i=1;i<=n;i++) cin >> a[i];
if(n>1000) return ;
for(int i=1;i<=n;i++) b[i]=a[n-i+1];
for(int i=n;i<=2*n-1;i++) b[i]=a[i-n+1];
ll mx=0;
for(int i=1;i<=2*n-1;i++)
{
dp[i][0]=1;
cnt[i][0]=1;
if(i==n)
{
dp[i][0]=-inf;
cnt[i][0]=0;
}
else
{
for(int j=1;j<i;j++)
{
if(j==n) continue;
if(b[j]<b[i])
{
if(dp[i][0]<dp[j][0]+1)
{
dp[i][0]=dp[j][0]+1;
cnt[i][0]=cnt[j][0];
}
else if(dp[i][0]==dp[j][0]+1)
{
cnt[i][0]=cnt[i][0]+cnt[j][0];
cnt[i][0]%=mod;
}
}
}
}
dp[i][1]=-inf;
cnt[i][1]=0;
if(i==n)
{
dp[i][1]=1;
cnt[i][1]=1;
for(int j=1;j<i;j++)
{
if(b[j]<b[i]&&dp[j][0]>0)
{
if(dp[i][1]<dp[j][0]+1)
{
dp[i][1]=dp[j][0]+1;
cnt[i][1]=cnt[j][0];
}
else if(dp[i][1]==dp[j][0]+1)
{
cnt[i][1]=cnt[i][1]+cnt[j][0];
cnt[i][1]%=mod;
}
}
}
}
else
{
for(int j=1;j<i;j++)
{
if(b[j]<b[i]&&dp[j][1]>0)
{
if(dp[i][1]<dp[j][1]+1)
{
dp[i][1]=dp[j][1]+1;
cnt[i][1]=cnt[j][1];
}
else if(dp[i][1]==dp[j][1]+1)
{
cnt[i][1]=cnt[i][1]+cnt[j][1];
cnt[i][1]%=mod;
}
}
}
}
mx=max({mx,dp[i][0],dp[i][1]});
}
ll ans=0;
for(int i=1;i<=2*n-1;i++)
{
//cout << dp[i][0]<<' '<<dp[i][1]<<'\n';
if(dp[i][0]==mx)
{
ans+=cnt[i][0]*pw(2,n-mx)%mod;
}
else if(dp[i][1]==mx)
{
ans+=cnt[i][1]*pw(2,n-mx)%mod;
}
ans%=mod;
}
cout <<mx <<' '<<ans;
}
int main()
{
fastio
//freopen(TASKNAME".INP","r",stdin);
//freopen(TASKNAME".OUT","w",stdout);
solve();
}
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---|---|---|---|---|
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