oj.uz

Submission #20990

# Submission time Handle Problem Language Result Execution time Memory
20990 2017-03-27T08:27:28 Z model_code Skyscraper (JOI16_skyscraper) C++11
100 / 100
 119 ms 313072 KB 
#include<stdio.h>
#include<algorithm>
#include<vector>
using namespace std;
long long mod=1000000007;
int c[110];
long long dp[110][110][1100][3];
int main(){
	int a,b;scanf("%d%d",&a,&b);
	for(int i=0;i<a;i++)scanf("%d",c+i);
	std::sort(c,c+a);
	if(a==1){
		printf("1\n");return 0;
	}
	c[a]=9999;
	if(c[1]-c[0]<=b)dp[1][1][c[1]-c[0]][1]=2;
	if((c[1]-c[0])*2<=b)dp[1][1][2*(c[1]-c[0])][0]=1;
	
	for(int i=1;i<a;i++){
		int ad=c[i+1]-c[i];
	//	printf("(%d)\n",ad);
		for(int j=0;j<=i;j++)for(int k=0;k<=b;k++)for(int l=0;l<3;l++){
			if(!dp[i][j][k][l])continue;
		//	printf("%d %d %d %d: %lld\n",i,j,k,l,dp[i][j][k][l]);
			if(l<2&&k+ad*(2*j-l-1)<=b){
			//	printf("%d\n",2*j-l-1);
				if(i==a-1)dp[i+1][j][k+ad*(2*j-l-1)][l+1]=(dp[i+1][j][k+ad*(2*j-l-1)][l+1]+dp[i][j][k][l]*(2-l)*j)%mod;
				else if(l==0||j>1)dp[i+1][j][k+ad*(2*j-l-1)][l+1]=(dp[i+1][j][k+ad*(2*j-l-1)][l+1]+dp[i][j][k][l]*(2-l)*(j-l))%mod;
				if(k+ad*(2*j-l+1)<=b){
					dp[i+1][j+1][k+ad*(2*j-l+1)][l+1]=(dp[i+1][j+1][k+ad*(2*j-l+1)][l+1]+dp[i][j][k][l]*(2-l))%mod;
				}
			}
	//		printf("%d\n",2*j-l);
			if(k+ad*(2*j-l+2)<=b)dp[i+1][j+1][k+ad*(2*j-l+2)][l]=(dp[i+1][j+1][k+ad*(2*j-l+2)][l]+dp[i][j][k][l])%mod;
			if(k+ad*(2*j-l)<=b)dp[i+1][j][k+ad*(2*j-l)][l]=(dp[i+1][j][k+ad*(2*j-l)][l]+dp[i][j][k][l]*(2*j-l))%mod;
			if(j>=2&&k+ad*(2*j-2-l)<=b&&(i==a-1||j>2||l<2)){
	//			printf("%d\n",2*j-2-l);
				if(l==0)dp[i+1][j-1][k+ad*(2*j-2-l)][l]=(dp[i+1][j-1][k+ad*(2*j-2-l)][l]+dp[i][j][k][l]*j*(j-1))%mod;
				if(l==1)dp[i+1][j-1][k+ad*(2*j-2-l)][l]=(dp[i+1][j-1][k+ad*(2*j-2-l)][l]+dp[i][j][k][l]*(j-1)*(j-1))%mod;
				if(l==2){
					if(i<a-1)dp[i+1][j-1][k+ad*(2*j-2-l)][l]=(dp[i+1][j-1][k+ad*(2*j-2-l)][l]+dp[i][j][k][l]*((j-2)*(j-2)+j-2))%mod;	
					else dp[i+1][j-1][k+ad*(2*j-2-l)][l]=(dp[i+1][j-1][k+ad*(2*j-2-l)][l]+dp[i][j][k][l]*((j-2)*(j-2)+j-1))%mod;	
				}
			}
		}
	}
	//for(int i=0;i<=a;i++)for(int j=0;j<=b;j++)for(int k=0;k<3;k++)if(dp[a][i][j][k])printf("%d %d %d: %lld\n",i,j,k,dp[a][i][j][k]);
	long long ret=0;
	for(int i=0;i<=b;i++)ret=(ret+dp[a][1][i][2])%mod;
	printf("%lld\n",ret);
}

Compilation message

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:9:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int a,b;scanf("%d%d",&a,&b);
                             ^
skyscraper.cpp:10:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=0;i<a;i++)scanf("%d",c+i);
                                     ^

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 313072 KB Output is correct
2 Correct 0 ms 313072 KB Output is correct
3 Correct 0 ms 313072 KB Output is correct
4 Correct 0 ms 313072 KB Output is correct
5 Correct 0 ms 313072 KB Output is correct
6 Correct 0 ms 313072 KB Output is correct
7 Correct 0 ms 313072 KB Output is correct
8 Correct 0 ms 313072 KB Output is correct
9 Correct 0 ms 313072 KB Output is correct
10 Correct 0 ms 313072 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 313072 KB Output is correct
2 Correct 0 ms 313072 KB Output is correct
3 Correct 0 ms 313072 KB Output is correct
4 Correct 0 ms 313072 KB Output is correct
5 Correct 0 ms 313072 KB Output is correct
6 Correct 0 ms 313072 KB Output is correct
7 Correct 0 ms 313072 KB Output is correct
8 Correct 0 ms 313072 KB Output is correct
9 Correct 0 ms 313072 KB Output is correct
10 Correct 0 ms 313072 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 313072 KB Output is correct
2 Correct 0 ms 313072 KB Output is correct
3 Correct 0 ms 313072 KB Output is correct
4 Correct 0 ms 313072 KB Output is correct
5 Correct 0 ms 313072 KB Output is correct
6 Correct 0 ms 313072 KB Output is correct
7 Correct 0 ms 313072 KB Output is correct
8 Correct 0 ms 313072 KB Output is correct
9 Correct 0 ms 313072 KB Output is correct
10 Correct 0 ms 313072 KB Output is correct
11 Correct 0 ms 313072 KB Output is correct
12 Correct 0 ms 313072 KB Output is correct
13 Correct 0 ms 313072 KB Output is correct
14 Correct 0 ms 313072 KB Output is correct
15 Correct 0 ms 313072 KB Output is correct
16 Correct 0 ms 313072 KB Output is correct
17 Correct 0 ms 313072 KB Output is correct
18 Correct 0 ms 313072 KB Output is correct
19 Correct 0 ms 313072 KB Output is correct
20 Correct 0 ms 313072 KB Output is correct
21 Correct 0 ms 313072 KB Output is correct
22 Correct 119 ms 313072 KB Output is correct
23 Correct 56 ms 313072 KB Output is correct
24 Correct 73 ms 313072 KB Output is correct
25 Correct 63 ms 313072 KB Output is correct
26 Correct 46 ms 313072 KB Output is correct
27 Correct 33 ms 313072 KB Output is correct
28 Correct 43 ms 313072 KB Output is correct
29 Correct 76 ms 313072 KB Output is correct
30 Correct 63 ms 313072 KB Output is correct