Submission #553924

#	Time	Username	Problem	Language	Result	Execution time	Memory
553924		ala2	Boat (APIO16_boat)	C++14	9 / 100	2076 ms	524288 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 b[1000100];
map<pair<pair<int,int>,int>,int>dp;
map<pair<pair<int,int>,int>,int>go;
const int mod=1e9+7;
//dp[ { {i,last},pl } ]
int f(int i,int last,int pl)
{
    if(go[ { {i,last},pl } ]!=0)
        return dp[ { {i,last},pl } ]%mod;
    if(i==n+1)
        return 1;
    int g=f(i+1,last,pl);
    for(int j=a[i];j<=b[i];j++)
    if(j>a[last]+pl)
        g+=f(i+1,i,j-a[i]);
    //cout<<"        "<<i<<"   "<<last<<"   "<<pl<<endl;
    go[ { {i,last},pl } ]=1;
    return dp[ { {i,last},pl } ]=g%mod;
}
signed main()
{
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
    //memset(dp,-1,sizeof dp);
    cin>>n;
    for(int i=1;i<=n;i++){
        //a[i]=n-i;
        cin>>a[i]>>b[i];
    }
        cout<<f(1,0,0)-1<<endl;
}

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