Submission #403895

#	Time	Username	Problem	Language	Result	Execution time	Memory
403895		sad	Boat (APIO16_boat)	C++14	9 / 100	5 ms	1324 KiB

boat

#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define pb push_back
using namespace std;
int dp[503][503],a[503],b[503];
int n;const int mod=1e9+7;
int d(int x,int y)
{
    if(x==n)return 1;
    int &u=dp[x][y];
    if(u!=-1)return u;
    u=0;
    u+=d(x+1,y);
    if(a[x]>a[y])u+=d(x+1,x);
    u%=mod;
    return u;
}
int main()
{
    cin>>n;
    memset(dp,-1,sizeof dp);
    for(int i=0;i<n;i++)
    {
        cin>>a[i]>>a[i];
    }
    ll re=0;
    for(int i=0;i<n;i++)
    {
        re+=d(i,i);
        re%=mod;
    }cout<<re;

}

• Subtask 1: 9 / 9
• Subtask 2: 0 / 22
• Subtask 3: 0 / 27
• Subtask 4: 0 / 42