Submission #553692

#	Time	Username	Problem	Language	Result	Execution time	Memory
553692		ala2	Boat (APIO16_boat)	C++14	9 / 100	6 ms	2316 KiB

boat

#include <bits/stdc++.h>
#define int long long
#define F first
#define S second
#define pb push_back
#define B begin()
#define E end()

using namespace std;
int n;
int a[1001000];
int dp[505][505];
const int mod=1e9+7;
int f(int i,int last)
{
    if(dp[i][last]!=-1)
        return dp[i][last]%mod;
    if(i==n+1)
        return 1;
    int g=f(i+1,last);
    if(a[i]>a[last])
        g+=f(i+1,i);
    return dp[i][last]=g%mod;
}
signed main()
{
    memset(dp,-1,sizeof dp);
    cin>>n;
    for(int i=1;i<=n;i++){
        //a[i]=n-i;
        cin>>a[i]>>a[i];
    }
        cout<<f(1,0)-1<<endl;

}

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