oj.uz

Submission #793023

# Submission time Handle Problem Language Result Execution time Memory
793023 2023-07-25T12:39:37 Z algorithm16 Boat (APIO16_boat) C++14
36 / 100
 2000 ms 10580 KB 
#include<iostream>
#include<cstring>
#include<vector>
#include<algorithm>
using namespace std;
int n,a[505],b[505],dp[1505][2][505][2],inv[505],mod=1e9+7;
vector <int> v,v1;
vector <vector<int> > v2;
int sum(int a,int b) {
	return (a+b)%mod;
}
int mul(int a,int b) {
	return ((long long)a*b)%mod;
}
int exp(int a,int b) {
	if(!b) return 1;
	int ret=exp(a,b/2);
	if(b%2==0) return mul(ret,ret);
	return mul(mul(ret,ret),a);
}
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cin >> n;
	for(int i=0;i<n;i++) {
		cin >> a[i] >> b[i];
		v.push_back(a[i]);
		v.push_back(b[i]);
		v.push_back(b[i]+1);
	}
	sort(v.begin(),v.end());
	v.erase(unique(v.begin(),v.end()),v.end());
	/*for(int i=0;i<v.size()-1;i++) {
		cout << v[i] << " " << v[i+1]-1 << "\n";
	}*/
	/*for(int i=0;i<n;i++) {
		a[i]=lower_bound(v.begin(),v.end(),a[i])-v.begin();
		b[i]=lower_bound(v.begin(),v.end(),b[i])-v.begin();
	}*/
	for(int i=1;i<=n;i++) {
		inv[i]=exp(i,mod-2);
	}
	for(int i=0;i<v.size()-1;i++) {
		for(int j=0;j<=n;j++) {
			dp[i][n%2][j][0]=1;
			dp[i][n%2][j][1]=1;
		}
	}
	for(int x=n-1;x>=0;x--) {
		for(int idx=v.size()-2;idx>=0;idx--) {
			for(int cnt=0;cnt<=x;cnt++) {
				for(int a1=0;a1<2;a1++) {
					int ret=0;
					if(!a1) ret=sum(ret,dp[idx][(x+1)%2][cnt][0]); // 0
					if(v[idx]>=a[x] && v[idx+1]-1<=b[x]) {
						if(cnt<=v[idx+1]-1-v[idx]) ret=sum(ret,mul(dp[idx][(x+1)%2][cnt+1][0],mul(v[idx+1]-v[idx]-cnt,inv[cnt+1])));
					}
					ret=sum(ret,dp[idx+1][x%2][0][1]);
					dp[idx][x%2][cnt][a1]=ret;
					//cout << idx << " " << x << " " << cnt << " " << a1 << "  " << ret << "\n";
				}
			}
		}
	}
	cout << dp[0][0][0][0]-1;
	return 0;
}

Compilation message

boat.cpp: In function 'int main()':
boat.cpp:44:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |  for(int i=0;i<v.size()-1;i++) {
      |              ~^~~~~~~~~~~

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 1611 ms 8228 KB Output is correct
2 Correct 1622 ms 8256 KB Output is correct
3 Correct 1612 ms 8240 KB Output is correct
4 Correct 1615 ms 8244 KB Output is correct
5 Correct 1612 ms 8244 KB Output is correct
6 Correct 1616 ms 8240 KB Output is correct
7 Correct 1617 ms 8268 KB Output is correct
8 Correct 1619 ms 8268 KB Output is correct
9 Correct 1622 ms 8268 KB Output is correct
10 Correct 1612 ms 8252 KB Output is correct
11 Correct 1611 ms 8240 KB Output is correct
12 Correct 1615 ms 8244 KB Output is correct
13 Correct 1617 ms 8240 KB Output is correct
14 Correct 1610 ms 8252 KB Output is correct
15 Correct 1613 ms 8240 KB Output is correct
16 Correct 283 ms 1748 KB Output is correct
17 Correct 306 ms 1840 KB Output is correct
18 Correct 293 ms 1780 KB Output is correct
19 Correct 306 ms 1852 KB Output is correct
20 Correct 297 ms 1792 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1611 ms 8228 KB Output is correct
2 Correct 1622 ms 8256 KB Output is correct
3 Correct 1612 ms 8240 KB Output is correct
4 Correct 1615 ms 8244 KB Output is correct
5 Correct 1612 ms 8244 KB Output is correct
6 Correct 1616 ms 8240 KB Output is correct
7 Correct 1617 ms 8268 KB Output is correct
8 Correct 1619 ms 8268 KB Output is correct
9 Correct 1622 ms 8268 KB Output is correct
10 Correct 1612 ms 8252 KB Output is correct
11 Correct 1611 ms 8240 KB Output is correct
12 Correct 1615 ms 8244 KB Output is correct
13 Correct 1617 ms 8240 KB Output is correct
14 Correct 1610 ms 8252 KB Output is correct
15 Correct 1613 ms 8240 KB Output is correct
16 Correct 283 ms 1748 KB Output is correct
17 Correct 306 ms 1840 KB Output is correct
18 Correct 293 ms 1780 KB Output is correct
19 Correct 306 ms 1852 KB Output is correct
20 Correct 297 ms 1792 KB Output is correct
21 Execution timed out 2078 ms 10580 KB Time limit exceeded
22 Halted 0 ms 0 KB -

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 2644 KB Output is correct
2 Correct 33 ms 2644 KB Output is correct
3 Correct 33 ms 2644 KB Output is correct
4 Correct 34 ms 2644 KB Output is correct
5 Correct 35 ms 2644 KB Output is correct
6 Correct 40 ms 2644 KB Output is correct
7 Correct 41 ms 2644 KB Output is correct
8 Correct 40 ms 2644 KB Output is correct
9 Correct 41 ms 2644 KB Output is correct
10 Correct 40 ms 2668 KB Output is correct
11 Correct 32 ms 2644 KB Output is correct
12 Correct 30 ms 2644 KB Output is correct
13 Correct 30 ms 2696 KB Output is correct
14 Correct 31 ms 2684 KB Output is correct
15 Correct 32 ms 2644 KB Output is correct
16 Correct 16 ms 1488 KB Output is correct
17 Correct 15 ms 1448 KB Output is correct
18 Correct 15 ms 1448 KB Output is correct
19 Correct 15 ms 1428 KB Output is correct
20 Correct 17 ms 1364 KB Output is correct

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 1611 ms 8228 KB Output is correct
2 Correct 1622 ms 8256 KB Output is correct
3 Correct 1612 ms 8240 KB Output is correct
4 Correct 1615 ms 8244 KB Output is correct
5 Correct 1612 ms 8244 KB Output is correct
6 Correct 1616 ms 8240 KB Output is correct
7 Correct 1617 ms 8268 KB Output is correct
8 Correct 1619 ms 8268 KB Output is correct
9 Correct 1622 ms 8268 KB Output is correct
10 Correct 1612 ms 8252 KB Output is correct
11 Correct 1611 ms 8240 KB Output is correct
12 Correct 1615 ms 8244 KB Output is correct
13 Correct 1617 ms 8240 KB Output is correct
14 Correct 1610 ms 8252 KB Output is correct
15 Correct 1613 ms 8240 KB Output is correct
16 Correct 283 ms 1748 KB Output is correct
17 Correct 306 ms 1840 KB Output is correct
18 Correct 293 ms 1780 KB Output is correct
19 Correct 306 ms 1852 KB Output is correct
20 Correct 297 ms 1792 KB Output is correct
21 Execution timed out 2078 ms 10580 KB Time limit exceeded
22 Halted 0 ms 0 KB -