Submission #2203332
Source Code Expand
#include <cstdio>
#include <algorithm>
using namespace std;
#define ref(i,x,y)for(int i=x;i<=y;++i)
#define def(i,x,y)for(int i=x;i>=y;--i)
const int mod=1e9+7;
void inc(int&a,int b){
a+=b;if(a>=mod)a-=mod;
}
void dec(int&a,int b){
a-=b;if(a<0)a+=mod;
}
int n,ans,a[100],f[100][100][51][51],g[100][100][51][51],h[51][51],h1[51][51],h2[201][102][102],h3[201][102][102];bool b[100];
int main(){
scanf("%d",&n);
ref(i,1,2*n-1)scanf("%d",&a[i]);
sort(a+1,a+2*n);
ref(i,1,n-1)if(a[i+1]!=a[i])b[i]=1;b[n]=1;
ref(i,n+1,2*n-1)if(a[i-1]!=a[i])b[i]=1;
f[n][n][1][1]=1;
def(ti,n,2){
ref(j,0,2*n)ref(I,1,n-ti+2)ref(J,1,I)h3[j][I][J]=0;
def(i,2*n-1,ti){
ref(j,i-1,2*n-ti+1)
ref(I,1,n-ti+2)ref(J,1,I)
h2[j][I][J]=0;
ref(j,i,2*n-ti)if(b[i]&&b[j]){
ref(I,1,n-ti+2)ref(J,1,I)h[I][J]=0,h1[I][J]=0;
ref(t,1,n-ti+1)ref(k,1,t)if(f[i][j][t][k]){
int s=f[i][j][t][k];
inc(h[t-k+2][1],s), dec(h[t+1][k],s);
if(k+1<=t) inc(h1[k+1][k+1],s), dec(h1[t+1][k+1],s);
inc(h1[t][k],s), dec(h1[t+1][k],s);
inc(h3[j][t-k+2][1],s);
if(j<=2*n-ti) inc(h2[j+1][k+1][k+1],s), dec(h2[2*n-ti+2][k+1][k+1],s);
}
ref(I,1,n-ti+2)ref(J,1,I){
inc(h[I][J],h[I-1][J-1]); inc(h1[I][J],h1[I-1][J]);
inc(g[i][j][I][J],h[I][J]);
inc(g[i][j][I][J],h1[I][J]);
}
}
if(b[i-1])ref(j,i,2*n-ti)
ref(t,1,n-ti+2)ref(k,1,t){
inc(g[i-1][j][t][k],h3[j][t][k]);
}
ref(j,i,2*n-ti+1)
ref(I,1,n-ti+2)ref(J,1,I){
inc(h2[j][I][J],h2[j-1][I][J]);
if(b[i]&&b[j])inc(g[i][j][I][J],h2[j][I][J]);
}
}
ref(i,1,2*n-1)ref(j,1,2*n-1)if(b[i]&&b[j])
ref(t,1,n-ti+2)ref(k,1,t)
f[i][j][t][k]=g[i][j][t][k],g[i][j][t][k]=0;
}
ref(i,1,2*n-1)ref(j,i,2*n-1)ref(t,1,n)ref(k,1,t)
inc(ans,f[i][j][t][k]);
printf("%d\n",ans);
}
Submission Info
Submission Time
2018-03-14 16:07:03+0900
Task
F - Prefix Median
User
fangyoule
Language
C++14 (GCC 5.4.1)
Score
2000
Code Size
1844 Byte
Status
AC
Exec Time
1823 ms
Memory
212736 KB
Compile Error
./Main.cpp: In function ‘int main()’:
./Main.cpp:15:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&n);
^
./Main.cpp:16:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
ref(i,1,2*n-1)scanf("%d",&a[i]);
^
Judge Result
Set Name
Sample
All
Score / Max Score
0 / 0
2000 / 2000
Status
Set Name
Test Cases
Sample
00_example_01.txt, 00_example_02.txt, 00_example_03.txt
All
00_example_01.txt, 00_example_02.txt, 00_example_03.txt, 01.txt, 02.txt, 03.txt, 04.txt, 05.txt, 06.txt, 07.txt, 08.txt, 09.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 20.txt, 21.txt, 22.txt, 23.txt, 24.txt, 25.txt, 26.txt, 27.txt, 28.txt, 29.txt, 30.txt, 31.txt, 32.txt, 33.txt, 34.txt, 35.txt, 36.txt, 37.txt, 38.txt, 39.txt, 40.txt, 41.txt, 42.txt, 43.txt, 44.txt, 45.txt, 46.txt, 47.txt, 48.txt, 49.txt, 50.txt, 51.txt
Case Name
Status
Exec Time
Memory
00_example_01.txt
AC
3 ms
12416 KB
00_example_02.txt
AC
4 ms
18688 KB
00_example_03.txt
AC
15 ms
57856 KB
01.txt
AC
1814 ms
212736 KB
02.txt
AC
1280 ms
197888 KB
03.txt
AC
170 ms
127872 KB
04.txt
AC
57 ms
99072 KB
05.txt
AC
31 ms
82560 KB
06.txt
AC
556 ms
164992 KB
07.txt
AC
1814 ms
212736 KB
08.txt
AC
31 ms
82560 KB
09.txt
AC
1823 ms
212736 KB
10.txt
AC
6 ms
28928 KB
11.txt
AC
12 ms
49536 KB
12.txt
AC
24 ms
74240 KB
13.txt
AC
404 ms
152576 KB
14.txt
AC
776 ms
177280 KB
15.txt
AC
6 ms
28928 KB
16.txt
AC
849 ms
206208 KB
17.txt
AC
10 ms
45440 KB
18.txt
AC
2 ms
8320 KB
19.txt
AC
1 ms
2176 KB
20.txt
AC
13 ms
55680 KB
21.txt
AC
12 ms
49536 KB
22.txt
AC
5 ms
20736 KB
23.txt
AC
65 ms
117632 KB
24.txt
AC
19 ms
70144 KB
25.txt
AC
63 ms
117632 KB
26.txt
AC
99 ms
125824 KB
27.txt
AC
19 ms
70144 KB
28.txt
AC
775 ms
201984 KB
29.txt
AC
31 ms
90880 KB
30.txt
AC
92 ms
131968 KB
31.txt
AC
5 ms
24832 KB
32.txt
AC
74 ms
119680 KB
33.txt
AC
4 ms
16640 KB
34.txt
AC
54 ms
113536 KB
35.txt
AC
472 ms
193792 KB
36.txt
AC
3 ms
12416 KB
37.txt
AC
593 ms
191744 KB
38.txt
AC
72 ms
109440 KB
39.txt
AC
39 ms
90880 KB
40.txt
AC
22 ms
76416 KB
41.txt
AC
253 ms
152704 KB
42.txt
AC
949 ms
210304 KB
43.txt
AC
24 ms
76416 KB
44.txt
AC
940 ms
204160 KB
45.txt
AC
6 ms
28928 KB
46.txt
AC
10 ms
47488 KB
47.txt
AC
19 ms
68096 KB
48.txt
AC
185 ms
148480 KB
49.txt
AC
381 ms
167040 KB
50.txt
AC
6 ms
26880 KB
51.txt
AC
187 ms
13696 KB