답안 #31096 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
31096	2017-08-09T18:08:42 Z	tatatan	Boat (APIO16_boat)	C++11	100 / 100	1296 ms	5176 KB

boat

#include <bits/stdc++.h>
#define mp make_pair
#define pb push_back
#define pii pair<int,int>
#define LL long long
#define st first
#define nd second
#define endl '\n'
using namespace std;

const int MAXN=505,mod=1e9+7;
int inverse[MAXN],dp[MAXN][MAXN*3],n,a[MAXN],b[MAXN];
vector<int> v;

void add(int &x,int y) {

	x+=y;
	if(x>=mod)
		x-=mod;

}

int bpow(int x,int y) {

	LL ret=1,t=x;
	while(y) {
		if(y&1)
			ret=(ret*t)%mod;
		y>>=1;
		t=(t*t)%mod;
	}
	return (int)ret;

}

int main() {

	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin>>n;
	for(int i=1;i<=n;++i) {
		cin>>a[i]>>b[i];
		v.pb(a[i]);
		v.pb(b[i]+1);
		inverse[i]=bpow(i,mod-2);
	}
	v.pb(0);
	sort(v.begin(),v.end());
	v.resize(unique(v.begin(),v.end())-v.begin());
	for(int i=1;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]+1)-v.begin();	
	}
	for(int i=0;i<v.size();++i)
		dp[n+1][i]=1;
	for(int i=n;i>=1;--i) {
		for(int j=v.size()-2;j>=1;--j) {
			add(dp[i][j],dp[i][j+1]);
			if(!(j>=a[i]&&j<b[i]))
				continue;
			LL nCr=1,x=v[j+1]-v[j],y=1;
			for(int k=i;k<=n;++k) {
				if(j>=a[k]&&j<b[k]) {
					nCr=(nCr*x)%mod;
					nCr=(nCr*inverse[y])%mod;
					++x; ++y;
				}
				add(dp[i][j],(nCr*dp[k+1][j+1])%mod);
			}
			//cout<<i<<" "<<j<<" "<<v[j]<<" "<<dp[i][j]<<endl;
		}
	}
	int ans=0;
	for(int i=1;i<=n;++i)
		add(ans,dp[i][1]);
	cout<<ans<< endl;

}

Compilation message

boat.cpp: In function 'int main()':
boat.cpp:54:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<v.size();++i)
               ^

Subtask #1
9.0 / 9.0

#	결과	실행 시간	메모리	Grader output
1	Correct	3 ms	5176 KB	Output is correct
2	Correct	0 ms	5176 KB	Output is correct
3	Correct	6 ms	5176 KB	Output is correct
4	Correct	6 ms	5176 KB	Output is correct
5	Correct	6 ms	5176 KB	Output is correct
6	Correct	3 ms	5176 KB	Output is correct
7	Correct	3 ms	5176 KB	Output is correct
8	Correct	3 ms	5176 KB	Output is correct
9	Correct	3 ms	5176 KB	Output is correct
10	Correct	3 ms	5176 KB	Output is correct
11	Correct	3 ms	5176 KB	Output is correct
12	Correct	3 ms	5176 KB	Output is correct
13	Correct	6 ms	5176 KB	Output is correct
14	Correct	6 ms	5176 KB	Output is correct
15	Correct	6 ms	5176 KB	Output is correct
16	Correct	0 ms	5176 KB	Output is correct
17	Correct	0 ms	5176 KB	Output is correct
18	Correct	3 ms	5176 KB	Output is correct
19	Correct	0 ms	5176 KB	Output is correct
20	Correct	3 ms	5176 KB	Output is correct

Subtask #2
22.0 / 22.0

#	결과	실행 시간	메모리	Grader output
1	Correct	3 ms	5176 KB	Output is correct
2	Correct	0 ms	5176 KB	Output is correct
3	Correct	6 ms	5176 KB	Output is correct
4	Correct	6 ms	5176 KB	Output is correct
5	Correct	6 ms	5176 KB	Output is correct
6	Correct	3 ms	5176 KB	Output is correct
7	Correct	3 ms	5176 KB	Output is correct
8	Correct	3 ms	5176 KB	Output is correct
9	Correct	3 ms	5176 KB	Output is correct
10	Correct	3 ms	5176 KB	Output is correct
11	Correct	3 ms	5176 KB	Output is correct
12	Correct	3 ms	5176 KB	Output is correct
13	Correct	6 ms	5176 KB	Output is correct
14	Correct	6 ms	5176 KB	Output is correct
15	Correct	6 ms	5176 KB	Output is correct
16	Correct	0 ms	5176 KB	Output is correct
17	Correct	0 ms	5176 KB	Output is correct
18	Correct	3 ms	5176 KB	Output is correct
19	Correct	0 ms	5176 KB	Output is correct
20	Correct	3 ms	5176 KB	Output is correct
21	Correct	863 ms	5176 KB	Output is correct
22	Correct	806 ms	5176 KB	Output is correct
23	Correct	736 ms	5176 KB	Output is correct
24	Correct	773 ms	5176 KB	Output is correct
25	Correct	819 ms	5176 KB	Output is correct
26	Correct	1146 ms	5176 KB	Output is correct
27	Correct	1063 ms	5176 KB	Output is correct
28	Correct	1033 ms	5176 KB	Output is correct
29	Correct	1136 ms	5176 KB	Output is correct
30	Correct	9 ms	5176 KB	Output is correct
31	Correct	6 ms	5176 KB	Output is correct
32	Correct	9 ms	5176 KB	Output is correct
33	Correct	9 ms	5176 KB	Output is correct
34	Correct	9 ms	5176 KB	Output is correct
35	Correct	6 ms	5176 KB	Output is correct
36	Correct	9 ms	5176 KB	Output is correct
37	Correct	9 ms	5176 KB	Output is correct
38	Correct	9 ms	5176 KB	Output is correct

Subtask #3
27.0 / 27.0

#	결과	실행 시간	메모리	Grader output
1	Correct	3 ms	5176 KB	Output is correct
2	Correct	3 ms	5176 KB	Output is correct
3	Correct	6 ms	5176 KB	Output is correct
4	Correct	6 ms	5176 KB	Output is correct
5	Correct	6 ms	5176 KB	Output is correct
6	Correct	9 ms	5176 KB	Output is correct
7	Correct	9 ms	5176 KB	Output is correct
8	Correct	9 ms	5176 KB	Output is correct
9	Correct	9 ms	5176 KB	Output is correct
10	Correct	6 ms	5176 KB	Output is correct
11	Correct	6 ms	5176 KB	Output is correct
12	Correct	6 ms	5176 KB	Output is correct
13	Correct	6 ms	5176 KB	Output is correct
14	Correct	6 ms	5176 KB	Output is correct
15	Correct	6 ms	5176 KB	Output is correct
16	Correct	3 ms	5176 KB	Output is correct
17	Correct	3 ms	5176 KB	Output is correct
18	Correct	3 ms	5176 KB	Output is correct
19	Correct	3 ms	5176 KB	Output is correct
20	Correct	3 ms	5176 KB	Output is correct

Subtask #4
42.0 / 42.0

#	결과	실행 시간	메모리	Grader output
1	Correct	3 ms	5176 KB	Output is correct
2	Correct	0 ms	5176 KB	Output is correct
3	Correct	6 ms	5176 KB	Output is correct
4	Correct	6 ms	5176 KB	Output is correct
5	Correct	6 ms	5176 KB	Output is correct
6	Correct	3 ms	5176 KB	Output is correct
7	Correct	3 ms	5176 KB	Output is correct
8	Correct	3 ms	5176 KB	Output is correct
9	Correct	3 ms	5176 KB	Output is correct
10	Correct	3 ms	5176 KB	Output is correct
11	Correct	3 ms	5176 KB	Output is correct
12	Correct	3 ms	5176 KB	Output is correct
13	Correct	6 ms	5176 KB	Output is correct
14	Correct	6 ms	5176 KB	Output is correct
15	Correct	6 ms	5176 KB	Output is correct
16	Correct	0 ms	5176 KB	Output is correct
17	Correct	0 ms	5176 KB	Output is correct
18	Correct	3 ms	5176 KB	Output is correct
19	Correct	0 ms	5176 KB	Output is correct
20	Correct	3 ms	5176 KB	Output is correct
21	Correct	863 ms	5176 KB	Output is correct
22	Correct	806 ms	5176 KB	Output is correct
23	Correct	736 ms	5176 KB	Output is correct
24	Correct	773 ms	5176 KB	Output is correct
25	Correct	819 ms	5176 KB	Output is correct
26	Correct	1146 ms	5176 KB	Output is correct
27	Correct	1063 ms	5176 KB	Output is correct
28	Correct	1033 ms	5176 KB	Output is correct
29	Correct	1136 ms	5176 KB	Output is correct
30	Correct	9 ms	5176 KB	Output is correct
31	Correct	6 ms	5176 KB	Output is correct
32	Correct	9 ms	5176 KB	Output is correct
33	Correct	9 ms	5176 KB	Output is correct
34	Correct	9 ms	5176 KB	Output is correct
35	Correct	6 ms	5176 KB	Output is correct
36	Correct	9 ms	5176 KB	Output is correct
37	Correct	9 ms	5176 KB	Output is correct
38	Correct	9 ms	5176 KB	Output is correct
39	Correct	3 ms	5176 KB	Output is correct
40	Correct	3 ms	5176 KB	Output is correct
41	Correct	6 ms	5176 KB	Output is correct
42	Correct	6 ms	5176 KB	Output is correct
43	Correct	6 ms	5176 KB	Output is correct
44	Correct	9 ms	5176 KB	Output is correct
45	Correct	9 ms	5176 KB	Output is correct
46	Correct	9 ms	5176 KB	Output is correct
47	Correct	9 ms	5176 KB	Output is correct
48	Correct	6 ms	5176 KB	Output is correct
49	Correct	6 ms	5176 KB	Output is correct
50	Correct	6 ms	5176 KB	Output is correct
51	Correct	6 ms	5176 KB	Output is correct
52	Correct	6 ms	5176 KB	Output is correct
53	Correct	6 ms	5176 KB	Output is correct
54	Correct	3 ms	5176 KB	Output is correct
55	Correct	3 ms	5176 KB	Output is correct
56	Correct	3 ms	5176 KB	Output is correct
57	Correct	3 ms	5176 KB	Output is correct
58	Correct	3 ms	5176 KB	Output is correct
59	Correct	969 ms	5176 KB	Output is correct
60	Correct	843 ms	5176 KB	Output is correct
61	Correct	773 ms	5176 KB	Output is correct
62	Correct	823 ms	5176 KB	Output is correct
63	Correct	933 ms	5176 KB	Output is correct
64	Correct	1296 ms	5176 KB	Output is correct
65	Correct	1233 ms	5176 KB	Output is correct
66	Correct	1146 ms	5176 KB	Output is correct
67	Correct	1226 ms	5176 KB	Output is correct
68	Correct	1149 ms	5176 KB	Output is correct
69	Correct	753 ms	5176 KB	Output is correct
70	Correct	709 ms	5176 KB	Output is correct
71	Correct	703 ms	5176 KB	Output is correct
72	Correct	889 ms	5176 KB	Output is correct
73	Correct	836 ms	5176 KB	Output is correct
74	Correct	146 ms	5176 KB	Output is correct
75	Correct	156 ms	5176 KB	Output is correct
76	Correct	163 ms	5176 KB	Output is correct
77	Correct	166 ms	5176 KB	Output is correct
78	Correct	169 ms	5176 KB	Output is correct

답안 #31096

Compilation message

Subtask #1 9.0 / 9.0

Subtask #2 22.0 / 22.0

Subtask #3 27.0 / 27.0

Subtask #4 42.0 / 42.0

Subtask #1
9.0 / 9.0

Subtask #2
22.0 / 22.0

Subtask #3
27.0 / 27.0

Subtask #4
42.0 / 42.0