Submission #537067

#	Time	Username	Problem	Language	Result	Execution time	Memory
537067		ammar2000	Boat (APIO16_boat)	C++17	9 / 100	3 ms	2380 KiB

boat

#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define F first
#define S second
#define coy cout<<"YES\n"
#define con cout<<"NO\n"
#define co1 cout<<"-1\n"
#define sc(x) scanf("%lld",&x)
#define all(x) x.begin(),x.end()
#define fast ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
using namespace std;
const int SI=3e5+7;
ll INF=8e18+7;
int dx[] = {1 , -1 , 0 , 0};
int dy[] = {0 , 0 , 1 , -1};
int MOD=1e9+7;
ll n,a[SI],b[SI],dp[505][505];
//map <pair <ll,pair<ll,ll> >,ll> dp,vis;
ll solve(int in,int li)
{
    if (in==n+1)
    {
        return li!=0;
    }
    if (dp[in][li]!=-1)
        return dp[in][li];
    ll ret=0;
    if (li==0)
    {
        ret=solve(in+1,in);
        ret%=MOD;
        ret+=solve(in+1,li);
    }
    else
    {
        if (a[in]>a[li])
            ret+=solve(in+1,in),ret%=MOD;
        ret+=solve(in+1,li);
    }
    return dp[in][li]=ret%MOD;
}
int main()
{
   fast
   memset(dp,-1,sizeof dp);
   cin>>n;
   for (int i=1;i<=n;i++)
    cin>>a[i]>>b[i];
   cout << solve(1,0);
   // use scanf not cin
   return 0;
}

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