Submission #69286

#	Time	Username	Problem	Language	Result	Execution time	Memory
69286		FedericoS	Boat (APIO16_boat)	C++14	0 / 100	2069 ms	27284 KiB

boat

#include <iostream>
#include <unordered_map>
#include <map>
using namespace std;
typedef long long int ll;
typedef pair<ll,ll> pll;

ll M=1000000007;
int N;
ll X[505],Y[505];
map<ll,ll> S;
map<pll,ll> DP;
ll ans;
unordered_map<ll,ll> R;

ll query(ll k, ll l, ll r, ll a, ll b){

	if(b<l or r<a) return 0;
	if(a<=l and r<=b) return R[k];

	ll m=(l+r)/2;
	return (query(2*k,l,m,a,b)+query(2*k+1,m+1,r,a,b))%M;

}

void insert(ll k, ll l, ll r, ll a, ll b){

	if(l==r) R[k]=(R[k]+b)%M;
	else{

		ll m=(l+r)/2;
		if(a<=m)
			insert(2*k,l,m,a,b);
		else
			insert(2*k+1,m+1,r,a,b);
		R[k]=(R[2*k]+R[2*k+1])%M;

	}

}

ll somma(ll a){
	return query(1,0,M,a,M-1);
}

void aggiungi(ll a, ll b){
	insert(1,0,M,a,b);
}

int main(){

	cin>>N;
	for(int i=0;i<N;i++)
		cin>>X[i]>>Y[i];

	while(clock()<N*1e4);

	for(int i=N-1;i>=0;i--)
		for(ll j=X[i];j<=Y[i];j++){
			DP[{i,j}]=(somma(j+1)+1)%M;
			aggiungi(j,DP[{i,j}]);
			ans=(ans+DP[{i,j}])%M;
			//cout<<i<<" "<<j<<" "<<DP[{i,j}]<<endl;
		}

	//for(int i=0;i<10;i++)cout<<i<<" "<<S[i]<<endl;

	cout<<ans;

}
/*
3
1 1
2 2
3 3
*/

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