oj.uz

답안 #268708

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
268708 2020-08-16T19:26:37 Z test2 Boat (APIO16_boat) C++14
9 / 100
 491 ms 25880 KB 
#include<bits/stdc++.h>

#define I inline void 

using ll = long long ; 
using ld = long double ; 

using namespace std ; 

const int N = 5000 + 7 , mod = 1e9 + 7 ; 

// how interesting!

int n; 

ll ans ; 
map<int , int > used ; 
set<pair<int , int> > st ; 
vector<pair<int , int> > v ; 

I add(int u , int v){
	while(u <=v && used[u])u++ ; 
	while(v>=u&&used[v])v-- ; 

	if(u <=v){
		used[u] = used[v] = 1; 
		st.insert({u , v}) ; 
	}
}

vector<int> onepiece[N * 10] ; 
std::vector<int> szs[N * 10];

ll dp[N][505] ; 

ll mul(ll a , ll b){
	return (1ll * a * b) %mod ; 
}

ll solve(int i , int j){
	if(dp[i][j]!=-1)
		return dp[i][j] ; 
	if(i == (int) st.size())
		return 1; 
	ll ret = solve(i+1 , j ) ; 

	int pos = 0 ;
	for(auto u : onepiece[i]){
		if(u > j){
			ll add = mul( szs[i][pos] , solve(i+1,  u) ) ; 
			ret = (ret + add) %mod  ; 
		}
		pos ++ ; 
	}
	return dp[i][j] = ret ; 
}

ll conts[N] ; 

int main(){	
	ios_base::sync_with_stdio(0) ; 
	cin.tie(0) ; 
	memset(dp , -1 , sizeof dp) ; 

	//freopen("in.in" , "r" , stdin) ;  
	cin >> n; 
	set<int> ev ; 

	for(int i = 0 ;i < n;i++){
		int x , y ; 
		cin >> x >> y ; 
		ev.insert(x) ; 
		ev.insert(y) ; 
		used[x] = used[y] = 1; 
		st.insert({x , x}) ; 
		st.insert({y , y}) ;
		//for(int j =x ;j <= y ;j ++)
		//	st.push_back({j , j})  ; 
		v.push_back({x , y}) ; 
	}
	
	int l = 0 ; 
	for(auto u : ev){
		if(l){
			add(l+1 , u - 1) ; 
		}
		l = u ; 
	}

	int pos = 0 ; 
	for(auto u : st){ 
		for(int j = 0 ;j < n; j++){
			if(  u.first>= v[j].first &&  u.second <= v[j].second ){
				onepiece[pos].push_back(j + 1) ; 
				szs[pos].push_back( u.second - u.first +1 ) ; 
				conts[j] +=  u.second -  u.first + 1 ; 
			}
		}
		pos ++ ; 
	}

	for(int i = 0 ;i < n;i++){
		assert((conts[i] == v[i].second - v[i].first + 1)) ; 
	}
		
	cout<< (mod + solve(0 ,  0 ) -1 ) %mod ; 
	return 0 ; 
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 20 ms 22784 KB Output is correct
2 Correct 22 ms 22784 KB Output is correct
3 Correct 20 ms 22784 KB Output is correct
4 Correct 20 ms 22784 KB Output is correct
5 Correct 20 ms 22784 KB Output is correct
6 Correct 20 ms 22784 KB Output is correct
7 Correct 20 ms 22784 KB Output is correct
8 Correct 20 ms 22784 KB Output is correct
9 Correct 20 ms 22784 KB Output is correct
10 Correct 20 ms 22784 KB Output is correct
11 Correct 26 ms 22904 KB Output is correct
12 Correct 22 ms 22784 KB Output is correct
13 Correct 22 ms 22784 KB Output is correct
14 Correct 25 ms 22784 KB Output is correct
15 Correct 20 ms 22784 KB Output is correct
16 Correct 16 ms 22528 KB Output is correct
17 Correct 16 ms 22528 KB Output is correct
18 Correct 16 ms 22528 KB Output is correct
19 Correct 19 ms 22528 KB Output is correct
20 Correct 16 ms 22528 KB Output is correct

Subtask #2
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 20 ms 22784 KB Output is correct
2 Correct 22 ms 22784 KB Output is correct
3 Correct 20 ms 22784 KB Output is correct
4 Correct 20 ms 22784 KB Output is correct
5 Correct 20 ms 22784 KB Output is correct
6 Correct 20 ms 22784 KB Output is correct
7 Correct 20 ms 22784 KB Output is correct
8 Correct 20 ms 22784 KB Output is correct
9 Correct 20 ms 22784 KB Output is correct
10 Correct 20 ms 22784 KB Output is correct
11 Correct 26 ms 22904 KB Output is correct
12 Correct 22 ms 22784 KB Output is correct
13 Correct 22 ms 22784 KB Output is correct
14 Correct 25 ms 22784 KB Output is correct
15 Correct 20 ms 22784 KB Output is correct
16 Correct 16 ms 22528 KB Output is correct
17 Correct 16 ms 22528 KB Output is correct
18 Correct 16 ms 22528 KB Output is correct
19 Correct 19 ms 22528 KB Output is correct
20 Correct 16 ms 22528 KB Output is correct
21 Incorrect 491 ms 25880 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 22 ms 22784 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# 결과 실행 시간 메모리 Grader output
1 Correct 20 ms 22784 KB Output is correct
2 Correct 22 ms 22784 KB Output is correct
3 Correct 20 ms 22784 KB Output is correct
4 Correct 20 ms 22784 KB Output is correct
5 Correct 20 ms 22784 KB Output is correct
6 Correct 20 ms 22784 KB Output is correct
7 Correct 20 ms 22784 KB Output is correct
8 Correct 20 ms 22784 KB Output is correct
9 Correct 20 ms 22784 KB Output is correct
10 Correct 20 ms 22784 KB Output is correct
11 Correct 26 ms 22904 KB Output is correct
12 Correct 22 ms 22784 KB Output is correct
13 Correct 22 ms 22784 KB Output is correct
14 Correct 25 ms 22784 KB Output is correct
15 Correct 20 ms 22784 KB Output is correct
16 Correct 16 ms 22528 KB Output is correct
17 Correct 16 ms 22528 KB Output is correct
18 Correct 16 ms 22528 KB Output is correct
19 Correct 19 ms 22528 KB Output is correct
20 Correct 16 ms 22528 KB Output is correct
21 Incorrect 491 ms 25880 KB Output isn't correct
22 Halted 0 ms 0 KB -