답안 #20365 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
20365	2017-02-07T08:42:08 Z		초음속철도 (OJUZ11_rail)	C++	45 / 100	614 ms	250228 KB

rail

#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
typedef long long ll;
#define MOD (ll)(1e9+7)

int N,M;
const int MAX_M = 5010;

ll dp[MAX_M][MAX_M];
ll dp2[200010];

struct pt{
	int s,e;
	pt(){}
	pt(int s_,int e_):s(s_),e(e_){}
	bool operator<(const pt& r)const{
		return s!=r.s?s<r.s:e<r.e;
	}
}a[MAX_M];

ll pw(ll x,ll y){
	ll ret=1;
	while(y){
		if(y&1)ret=(ret*x)%MOD;
		x=(x*x)%MOD;
		y>>=1;
	}
	return ret;
}

ll f(int x,int lim){
	if(x>M)return a[lim].e==N;
	if(a[lim].e<a[x].s)return 0;
	ll& ret=dp[x][lim];
	if(~ret)return ret;
	ret=(f(x+1,lim)+f(x+1,a[lim].e<a[x].e?x:lim))%MOD;

	return ret;
}

ll f2(int x){
	if(x==N)return 1;
	ll& ret=dp2[x];
	if(~ret)return ret;
	ret=0;
	int L=lower_bound(a+1,a+M+1,pt(x,0))-a;
	int R=lower_bound(a+1,a+M+1,pt(x+1,0))-a;
	for(int i=L;i<R;i++){
		ret+=f2(a[i].e);
		ret%=MOD;
	}
	return ret;
}

int cmp[MAX_M*2],sz;
int main(){

	memset(dp,-1,sizeof(dp));
	memset(dp2,-1,sizeof(dp2));

	scanf("%d%d",&N,&M);

	a[0]=pt{1,1};
	cmp[sz++]=1;cmp[sz++]=N;
	for(int i=1,x,y;i<=M;i++){
		scanf("%d%d",&x,&y);
		a[i]=pt(x,y);
		cmp[sz++]=x;
		cmp[sz++]=y;
	}

	sort(cmp,cmp+sz);
	sz=unique(cmp,cmp+sz)-cmp;
	for(int i=0;i<=M;i++){
		a[i].s=lower_bound(cmp,cmp+sz,a[i].s)-cmp;
		a[i].e=lower_bound(cmp,cmp+sz,a[i].e)-cmp;
	}
	N=lower_bound(cmp,cmp+sz,N)-cmp;

	sort(a+1,a+M+1);
	
	if(M>=MAX_M){
		printf("%lld\n",f2(0));
	}

	printf("%lld\n",f(1,0));

	return 0;
}

Compilation message

rail.cpp: In function 'int main()':
rail.cpp:65:9: warning: extended initializer lists only available with -std=c++11 or -std=gnu++11
  a[0]=pt{1,1};
         ^
rail.cpp:63:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&N,&M);
                     ^
rail.cpp:68:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&x,&y);
                      ^

Subtask #1
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	126 ms	198232 KB	Output is correct
2	Correct	141 ms	198256 KB	Output is correct
3	Correct	125 ms	198356 KB	Output is correct
4	Correct	126 ms	198356 KB	Output is correct
5	Correct	126 ms	198396 KB	Output is correct
6	Correct	125 ms	198396 KB	Output is correct
7	Correct	124 ms	198396 KB	Output is correct
8	Correct	138 ms	198396 KB	Output is correct
9	Correct	128 ms	198396 KB	Output is correct
10	Correct	129 ms	198396 KB	Output is correct
11	Correct	125 ms	198396 KB	Output is correct
12	Correct	126 ms	198396 KB	Output is correct
13	Correct	129 ms	198396 KB	Output is correct
14	Correct	127 ms	198396 KB	Output is correct
15	Correct	128 ms	198396 KB	Output is correct
16	Correct	126 ms	198396 KB	Output is correct

Subtask #2
8.0 / 8.0

#	결과	실행 시간	메모리	Grader output
1	Correct	126 ms	198232 KB	Output is correct
2	Correct	141 ms	198256 KB	Output is correct
3	Correct	125 ms	198356 KB	Output is correct
4	Correct	126 ms	198356 KB	Output is correct
5	Correct	126 ms	198396 KB	Output is correct
6	Correct	125 ms	198396 KB	Output is correct
7	Correct	124 ms	198396 KB	Output is correct
8	Correct	138 ms	198396 KB	Output is correct
9	Correct	128 ms	198396 KB	Output is correct
10	Correct	129 ms	198396 KB	Output is correct
11	Correct	125 ms	198396 KB	Output is correct
12	Correct	126 ms	198396 KB	Output is correct
13	Correct	129 ms	198396 KB	Output is correct
14	Correct	127 ms	198396 KB	Output is correct
15	Correct	128 ms	198396 KB	Output is correct
16	Correct	126 ms	198396 KB	Output is correct
17	Correct	130 ms	198396 KB	Output is correct
18	Correct	127 ms	198396 KB	Output is correct
19	Correct	124 ms	198396 KB	Output is correct
20	Correct	133 ms	198400 KB	Output is correct
21	Correct	130 ms	198400 KB	Output is correct
22	Correct	128 ms	198400 KB	Output is correct
23	Correct	126 ms	198400 KB	Output is correct
24	Correct	126 ms	198400 KB	Output is correct
25	Correct	124 ms	198400 KB	Output is correct
26	Correct	126 ms	198400 KB	Output is correct
27	Correct	133 ms	198400 KB	Output is correct
28	Correct	127 ms	198400 KB	Output is correct
29	Correct	126 ms	198400 KB	Output is correct
30	Correct	126 ms	198420 KB	Output is correct
31	Correct	128 ms	198420 KB	Output is correct
32	Correct	128 ms	198420 KB	Output is correct

Subtask #3
0 / 25.0

#	결과	실행 시간	메모리	Grader output
1	Correct	126 ms	198420 KB	Output is correct
2	Correct	126 ms	198420 KB	Output is correct
3	Correct	128 ms	198420 KB	Output is correct
4	Correct	480 ms	198780 KB	Output is correct
5	Incorrect	228 ms	198780 KB	Output isn't correct
6	Incorrect	261 ms	198780 KB	Output isn't correct
7	Incorrect	262 ms	198780 KB	Output isn't correct
8	Correct	127 ms	198780 KB	Output is correct
9	Incorrect	246 ms	198780 KB	Output isn't correct
10	Incorrect	276 ms	198780 KB	Output isn't correct
11	Incorrect	174 ms	198784 KB	Output isn't correct
12	Incorrect	271 ms	198784 KB	Output isn't correct
13	Incorrect	275 ms	198784 KB	Output isn't correct
14	Incorrect	194 ms	198784 KB	Output isn't correct
15	Incorrect	203 ms	198956 KB	Output isn't correct
16	Incorrect	264 ms	198956 KB	Output isn't correct
17	Incorrect	260 ms	198956 KB	Output isn't correct
18	Incorrect	266 ms	198956 KB	Output isn't correct

Subtask #4
27.0 / 27.0

#	결과	실행 시간	메모리	Grader output
1	Correct	126 ms	198232 KB	Output is correct
2	Correct	141 ms	198256 KB	Output is correct
3	Correct	125 ms	198356 KB	Output is correct
4	Correct	126 ms	198356 KB	Output is correct
5	Correct	126 ms	198396 KB	Output is correct
6	Correct	125 ms	198396 KB	Output is correct
7	Correct	124 ms	198396 KB	Output is correct
8	Correct	138 ms	198396 KB	Output is correct
9	Correct	128 ms	198396 KB	Output is correct
10	Correct	129 ms	198396 KB	Output is correct
11	Correct	125 ms	198396 KB	Output is correct
12	Correct	126 ms	198396 KB	Output is correct
13	Correct	129 ms	198396 KB	Output is correct
14	Correct	127 ms	198396 KB	Output is correct
15	Correct	128 ms	198396 KB	Output is correct
16	Correct	126 ms	198396 KB	Output is correct
17	Correct	130 ms	198396 KB	Output is correct
18	Correct	127 ms	198396 KB	Output is correct
19	Correct	124 ms	198396 KB	Output is correct
20	Correct	133 ms	198400 KB	Output is correct
21	Correct	130 ms	198400 KB	Output is correct
22	Correct	128 ms	198400 KB	Output is correct
23	Correct	126 ms	198400 KB	Output is correct
24	Correct	126 ms	198400 KB	Output is correct
25	Correct	124 ms	198400 KB	Output is correct
26	Correct	126 ms	198400 KB	Output is correct
27	Correct	133 ms	198400 KB	Output is correct
28	Correct	127 ms	198400 KB	Output is correct
29	Correct	126 ms	198400 KB	Output is correct
30	Correct	126 ms	198420 KB	Output is correct
31	Correct	128 ms	198420 KB	Output is correct
32	Correct	128 ms	198420 KB	Output is correct
33	Correct	400 ms	198956 KB	Output is correct
34	Correct	409 ms	198956 KB	Output is correct
35	Correct	388 ms	198956 KB	Output is correct
36	Correct	607 ms	198956 KB	Output is correct
37	Correct	140 ms	198956 KB	Output is correct
38	Correct	287 ms	198956 KB	Output is correct
39	Correct	129 ms	198956 KB	Output is correct
40	Correct	589 ms	198956 KB	Output is correct
41	Correct	595 ms	198956 KB	Output is correct
42	Correct	529 ms	198956 KB	Output is correct
43	Correct	470 ms	198956 KB	Output is correct
44	Correct	563 ms	198956 KB	Output is correct
45	Correct	574 ms	198956 KB	Output is correct
46	Correct	589 ms	198956 KB	Output is correct
47	Correct	614 ms	198956 KB	Output is correct
48	Correct	139 ms	198956 KB	Output is correct
49	Correct	129 ms	198956 KB	Output is correct
50	Correct	253 ms	198956 KB	Output is correct
51	Correct	133 ms	198956 KB	Output is correct

Subtask #5
0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	126 ms	198232 KB	Output is correct
2	Correct	141 ms	198256 KB	Output is correct
3	Correct	125 ms	198356 KB	Output is correct
4	Correct	126 ms	198356 KB	Output is correct
5	Correct	126 ms	198396 KB	Output is correct
6	Correct	125 ms	198396 KB	Output is correct
7	Correct	124 ms	198396 KB	Output is correct
8	Correct	138 ms	198396 KB	Output is correct
9	Correct	128 ms	198396 KB	Output is correct
10	Correct	129 ms	198396 KB	Output is correct
11	Correct	125 ms	198396 KB	Output is correct
12	Correct	126 ms	198396 KB	Output is correct
13	Correct	129 ms	198396 KB	Output is correct
14	Correct	127 ms	198396 KB	Output is correct
15	Correct	128 ms	198396 KB	Output is correct
16	Correct	126 ms	198396 KB	Output is correct
17	Correct	130 ms	198396 KB	Output is correct
18	Correct	127 ms	198396 KB	Output is correct
19	Correct	124 ms	198396 KB	Output is correct
20	Correct	133 ms	198400 KB	Output is correct
21	Correct	130 ms	198400 KB	Output is correct
22	Correct	128 ms	198400 KB	Output is correct
23	Correct	126 ms	198400 KB	Output is correct
24	Correct	126 ms	198400 KB	Output is correct
25	Correct	124 ms	198400 KB	Output is correct
26	Correct	126 ms	198400 KB	Output is correct
27	Correct	133 ms	198400 KB	Output is correct
28	Correct	127 ms	198400 KB	Output is correct
29	Correct	126 ms	198400 KB	Output is correct
30	Correct	126 ms	198420 KB	Output is correct
31	Correct	128 ms	198420 KB	Output is correct
32	Correct	128 ms	198420 KB	Output is correct
33	Correct	126 ms	198420 KB	Output is correct
34	Correct	126 ms	198420 KB	Output is correct
35	Correct	128 ms	198420 KB	Output is correct
36	Correct	480 ms	198780 KB	Output is correct
37	Incorrect	228 ms	198780 KB	Output isn't correct
38	Incorrect	261 ms	198780 KB	Output isn't correct
39	Incorrect	262 ms	198780 KB	Output isn't correct
40	Correct	127 ms	198780 KB	Output is correct
41	Incorrect	246 ms	198780 KB	Output isn't correct
42	Incorrect	276 ms	198780 KB	Output isn't correct
43	Incorrect	174 ms	198784 KB	Output isn't correct
44	Incorrect	271 ms	198784 KB	Output isn't correct
45	Incorrect	275 ms	198784 KB	Output isn't correct
46	Incorrect	194 ms	198784 KB	Output isn't correct
47	Incorrect	203 ms	198956 KB	Output isn't correct
48	Incorrect	264 ms	198956 KB	Output isn't correct
49	Incorrect	260 ms	198956 KB	Output isn't correct
50	Incorrect	266 ms	198956 KB	Output isn't correct
51	Correct	400 ms	198956 KB	Output is correct
52	Correct	409 ms	198956 KB	Output is correct
53	Correct	388 ms	198956 KB	Output is correct
54	Correct	607 ms	198956 KB	Output is correct
55	Correct	140 ms	198956 KB	Output is correct
56	Correct	287 ms	198956 KB	Output is correct
57	Correct	129 ms	198956 KB	Output is correct
58	Correct	589 ms	198956 KB	Output is correct
59	Correct	595 ms	198956 KB	Output is correct
60	Correct	529 ms	198956 KB	Output is correct
61	Correct	470 ms	198956 KB	Output is correct
62	Correct	563 ms	198956 KB	Output is correct
63	Correct	574 ms	198956 KB	Output is correct
64	Correct	589 ms	198956 KB	Output is correct
65	Correct	614 ms	198956 KB	Output is correct
66	Correct	139 ms	198956 KB	Output is correct
67	Correct	129 ms	198956 KB	Output is correct
68	Correct	253 ms	198956 KB	Output is correct
69	Correct	133 ms	198956 KB	Output is correct
70	Incorrect	267 ms	198956 KB	Output isn't correct
71	Incorrect	222 ms	198956 KB	Output isn't correct
72	Runtime error	270 ms	250092 KB	Execution killed with signal 11 (could be triggered by violating memory limits)
73	Incorrect	176 ms	250124 KB	Output isn't correct
74	Incorrect	236 ms	250188 KB	Output isn't correct
75	Incorrect	266 ms	250188 KB	Output isn't correct
76	Correct	506 ms	250188 KB	Output is correct
77	Runtime error	458 ms	250228 KB	Execution killed with signal 11 (could be triggered by violating memory limits)
78	Incorrect	180 ms	250228 KB	Output isn't correct
79	Runtime error	314 ms	250228 KB	Execution killed with signal 11 (could be triggered by violating memory limits)
80	Incorrect	252 ms	250228 KB	Output isn't correct
81	Incorrect	252 ms	250228 KB	Output isn't correct
82	Incorrect	210 ms	250228 KB	Output isn't correct
83	Incorrect	232 ms	250228 KB	Output isn't correct
84	Incorrect	272 ms	250228 KB	Output isn't correct
85	Incorrect	272 ms	250228 KB	Output isn't correct
86	Incorrect	275 ms	250228 KB	Output isn't correct
87	Incorrect	285 ms	250228 KB	Output isn't correct
88	Incorrect	273 ms	250228 KB	Output isn't correct
89	Incorrect	261 ms	250228 KB	Output isn't correct
90	Incorrect	260 ms	250228 KB	Output isn't correct

답안 #20365

Compilation message

Subtask #1 10.0 / 10.0

Subtask #2 8.0 / 8.0

Subtask #3 0 / 25.0

Subtask #4 27.0 / 27.0

Subtask #5 0 / 30.0

Subtask #1
10.0 / 10.0

Subtask #2
8.0 / 8.0

Subtask #3
0 / 25.0

Subtask #4
27.0 / 27.0

Subtask #5
0 / 30.0