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Submission #268700

# Submission time Handle Problem Language Result Execution time Memory
268700 2020-08-16T19:02:35 Z test2 Boat (APIO16_boat) C++14
9 / 100
 1081 ms 524292 KB 
#include<bits/stdc++.h>

#define I inline void 

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

using namespace std ; 

const int N = 3000 + 7 , mod = 1e9 + 7 ; 

// how interesting!

int n; 

ll ans ; 
map<int , int > used ; 
vector<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){
		st.push_back({u , v}) ; 
	}
}

vector<int> onepiece[N * 10] ; 

ll dp[N][N] ; 

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 ) ; 

	for(auto u : onepiece[i]){
		if(u > j){
			ll add = mul(st[i].second - st[i].first +1ll , solve(i+1,  u) ) ; 
			ret = (ret + add) %mod  ; 
		}
	}
	return dp[i][j] = ret ; 
}


int main(){	
	ios_base::sync_with_stdio(0) ; 
	cin.tie(0) ; 
	memset(dp , -1 , sizeof dp) ; 
	srand(time(0)) ; 
	//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.push_back({x , x}) ; 
		st.push_back({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 ; 
	}*/

	sort(st.begin() , st.end()) ; 
	st.resize( unique(st.begin() , st.end()) - st.begin()) ; 
	sort(st.begin() , st.end()) ; 

	for(int i = 0 ;i < (int) st.size() ; i++){
		for(int j = 0 ;j < n; j++){
			if( st[i].first>= v[j].first && st[i].second <= v[j].second ){
				onepiece[i].push_back(j + 1) ; 
			}
		}
	}
	
	for(int i = 1 ;i < (int) st.size() ;i ++){
		assert( st[i].first > st[i-1].second ) ; 
		assert(st[i].first <= st[i].second) ; 
	}

	cout<< (mod + solve(0 ,  0 ) -1 ) %mod ; 
	return 0 ; 
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 46 ms 71928 KB Output is correct
2 Correct 45 ms 71928 KB Output is correct
3 Correct 46 ms 71928 KB Output is correct
4 Correct 47 ms 71928 KB Output is correct
5 Correct 47 ms 71940 KB Output is correct
6 Correct 47 ms 71928 KB Output is correct
7 Correct 47 ms 71824 KB Output is correct
8 Correct 47 ms 71928 KB Output is correct
9 Correct 48 ms 71928 KB Output is correct
10 Correct 47 ms 71928 KB Output is correct
11 Correct 46 ms 71932 KB Output is correct
12 Correct 46 ms 71928 KB Output is correct
13 Correct 46 ms 71928 KB Output is correct
14 Correct 46 ms 71932 KB Output is correct
15 Correct 46 ms 71928 KB Output is correct
16 Correct 44 ms 71800 KB Output is correct
17 Correct 44 ms 71928 KB Output is correct
18 Correct 43 ms 71800 KB Output is correct
19 Correct 44 ms 71800 KB Output is correct
20 Correct 45 ms 71800 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 46 ms 71928 KB Output is correct
2 Correct 45 ms 71928 KB Output is correct
3 Correct 46 ms 71928 KB Output is correct
4 Correct 47 ms 71928 KB Output is correct
5 Correct 47 ms 71940 KB Output is correct
6 Correct 47 ms 71928 KB Output is correct
7 Correct 47 ms 71824 KB Output is correct
8 Correct 47 ms 71928 KB Output is correct
9 Correct 48 ms 71928 KB Output is correct
10 Correct 47 ms 71928 KB Output is correct
11 Correct 46 ms 71932 KB Output is correct
12 Correct 46 ms 71928 KB Output is correct
13 Correct 46 ms 71928 KB Output is correct
14 Correct 46 ms 71932 KB Output is correct
15 Correct 46 ms 71928 KB Output is correct
16 Correct 44 ms 71800 KB Output is correct
17 Correct 44 ms 71928 KB Output is correct
18 Correct 43 ms 71800 KB Output is correct
19 Correct 44 ms 71800 KB Output is correct
20 Correct 45 ms 71800 KB Output is correct
21 Incorrect 1081 ms 83524 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Runtime error 785 ms 524292 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 46 ms 71928 KB Output is correct
2 Correct 45 ms 71928 KB Output is correct
3 Correct 46 ms 71928 KB Output is correct
4 Correct 47 ms 71928 KB Output is correct
5 Correct 47 ms 71940 KB Output is correct
6 Correct 47 ms 71928 KB Output is correct
7 Correct 47 ms 71824 KB Output is correct
8 Correct 47 ms 71928 KB Output is correct
9 Correct 48 ms 71928 KB Output is correct
10 Correct 47 ms 71928 KB Output is correct
11 Correct 46 ms 71932 KB Output is correct
12 Correct 46 ms 71928 KB Output is correct
13 Correct 46 ms 71928 KB Output is correct
14 Correct 46 ms 71932 KB Output is correct
15 Correct 46 ms 71928 KB Output is correct
16 Correct 44 ms 71800 KB Output is correct
17 Correct 44 ms 71928 KB Output is correct
18 Correct 43 ms 71800 KB Output is correct
19 Correct 44 ms 71800 KB Output is correct
20 Correct 45 ms 71800 KB Output is correct
21 Incorrect 1081 ms 83524 KB Output isn't correct
22 Halted 0 ms 0 KB -