oj.uz

Submission #673401

# Submission time Handle Problem Language Result Execution time Memory
673401 2022-12-20T13:53:44 Z S2speed Boat (APIO16_boat) C++17
9 / 100
 115 ms 8428 KB 
#include<bits/stdc++.h>

using namespace std;

#pragma GCC optimize ("Ofast")

#define all(x) x.begin() , x.end()
#define sze(x) (ll)(x.size())
typedef long long ll;

const ll maxn = 1e3 + 17 , md = 1e9 + 7;

ll tav(ll n , ll k){
	ll res = 1;
	while(k > 0){
		if(k & 1){
			res *= n; res %= md;
		}
		n *= n; n %= md;
		k >>= 1;
	}
	return res;
}

ll l[maxn] , r[maxn] , w[maxn] , f[maxn][maxn] , dp[maxn][maxn] , pd[maxn];
vector<ll> v;

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);

	ll n;
	cin>>n;
	for(ll i = 0 ; i < n ; i++){
		cin>>l[i]>>r[i]; l[i]--;
		v.push_back(l[i]); v.push_back(r[i]);
	}
	sort(all(v));
	v.resize(distance(v.begin() , unique(all(v))));
	ll vs = sze(v);
	for(ll i = 0 ; i < vs - 1 ; i++){
		w[i] = v[i + 1] - v[i];
		ll lm = min(w[i] , n);
		for(ll j = 1 ; j <= lm ; j++){
			f[i][j] = (w[i] - j + 1) * tav(j , md - 2) % md;
		}
	}
	for(ll i = 0 ; i < n ; i++){
		l[i] = lower_bound(all(v) , l[i]) - v.begin();
		r[i] = lower_bound(all(v) , r[i]) - v.begin();
	}
	fill(pd , pd + vs - 1 , 1);
	for(ll i = 0 ; i < n ; i++){
		for(ll j = r[i] - 1 ; j >= l[i] ; j--){
			ll h = 0 , lm = min(i , w[j]);
			for(ll k = lm ; k > 1 ; k--){
				ll o = dp[j][k - 1] * f[j][k] % md;
				dp[j][k] += o; dp[j][k] -= (dp[j][k] <= md) * md;
				h += o;
			}
			dp[j][1] += pd[j]; dp[j][1] -= (dp[j][1] >= md) * md;
			h += pd[j];
			for(ll k = j + 1 ; k < vs ; k++){
				pd[k] += h; pd[k] %= md;
			}
		}
	}
	ll ans = pd[vs - 1];
	cout<<ans<<'\n';
	return 0;
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 36 ms 8428 KB Output is correct
2 Correct 37 ms 8228 KB Output is correct
3 Correct 39 ms 8212 KB Output is correct
4 Correct 37 ms 8268 KB Output is correct
5 Correct 38 ms 8220 KB Output is correct
6 Correct 37 ms 8264 KB Output is correct
7 Correct 35 ms 8208 KB Output is correct
8 Correct 36 ms 8236 KB Output is correct
9 Correct 36 ms 8316 KB Output is correct
10 Correct 36 ms 8272 KB Output is correct
11 Correct 37 ms 8312 KB Output is correct
12 Correct 40 ms 8320 KB Output is correct
13 Correct 36 ms 8268 KB Output is correct
14 Correct 37 ms 8268 KB Output is correct
15 Correct 36 ms 8240 KB Output is correct
16 Correct 7 ms 1748 KB Output is correct
17 Correct 8 ms 1876 KB Output is correct
18 Correct 7 ms 1740 KB Output is correct
19 Correct 7 ms 1876 KB Output is correct
20 Correct 7 ms 1748 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 36 ms 8428 KB Output is correct
2 Correct 37 ms 8228 KB Output is correct
3 Correct 39 ms 8212 KB Output is correct
4 Correct 37 ms 8268 KB Output is correct
5 Correct 38 ms 8220 KB Output is correct
6 Correct 37 ms 8264 KB Output is correct
7 Correct 35 ms 8208 KB Output is correct
8 Correct 36 ms 8236 KB Output is correct
9 Correct 36 ms 8316 KB Output is correct
10 Correct 36 ms 8272 KB Output is correct
11 Correct 37 ms 8312 KB Output is correct
12 Correct 40 ms 8320 KB Output is correct
13 Correct 36 ms 8268 KB Output is correct
14 Correct 37 ms 8268 KB Output is correct
15 Correct 36 ms 8240 KB Output is correct
16 Correct 7 ms 1748 KB Output is correct
17 Correct 8 ms 1876 KB Output is correct
18 Correct 7 ms 1740 KB Output is correct
19 Correct 7 ms 1876 KB Output is correct
20 Correct 7 ms 1748 KB Output is correct
21 Incorrect 115 ms 7732 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 2260 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 36 ms 8428 KB Output is correct
2 Correct 37 ms 8228 KB Output is correct
3 Correct 39 ms 8212 KB Output is correct
4 Correct 37 ms 8268 KB Output is correct
5 Correct 38 ms 8220 KB Output is correct
6 Correct 37 ms 8264 KB Output is correct
7 Correct 35 ms 8208 KB Output is correct
8 Correct 36 ms 8236 KB Output is correct
9 Correct 36 ms 8316 KB Output is correct
10 Correct 36 ms 8272 KB Output is correct
11 Correct 37 ms 8312 KB Output is correct
12 Correct 40 ms 8320 KB Output is correct
13 Correct 36 ms 8268 KB Output is correct
14 Correct 37 ms 8268 KB Output is correct
15 Correct 36 ms 8240 KB Output is correct
16 Correct 7 ms 1748 KB Output is correct
17 Correct 8 ms 1876 KB Output is correct
18 Correct 7 ms 1740 KB Output is correct
19 Correct 7 ms 1876 KB Output is correct
20 Correct 7 ms 1748 KB Output is correct
21 Incorrect 115 ms 7732 KB Output isn't correct
22 Halted 0 ms 0 KB -