oj.uz

답안 #329063

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
329063 2020-11-18T22:25:54 Z KWang31 Nautilus (BOI19_nautilus) Java 11
66 / 100
 1000 ms 22220 KB 
import java.io.*; import java.util.*;
public class nautilus{
  static class FastReader 
    { 
        BufferedReader br; 
        StringTokenizer st; 
  
        public FastReader() 
        { 
            br = new BufferedReader(new
                     InputStreamReader(System.in)); 
        } 
  
        String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 
  
        int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } 
  
        
    } 
    static int MOD=998244353;
    static long[][] map;
    static long[][] dp;
    static long[] ans;
    static int R,C;
    public static void main(String[] args){
        /*
        for (int i = 0; i < 2; i++) {
            for (int j = 0; j < 65; j++) {
                System.out.print(".");
            }
            System.out.println("");
        }*/
        
        FastReader br=new FastReader();
        R=br.nextInt(); C=br.nextInt();int M=br.nextInt();
        map=new long[R][(C+63)/64]; String s;
        for (int i = 0; i < R; i++) {//Setting up the map
            s=br.next();
            
            for (int j = 0; j < C; j+=64) {
                for (int k = 0; k <Math.min(C-j,64); k++) {
                    
                    if(j+k<C && s.charAt(j+k)=='.'){
                        
                        map[i][j/64]|=(long) 1<<k;
                        //System.out.println(i+"::"+j+"::"+map[i][j/64]);
                    }
                }
            }
        }
        
        s=br.next(); dp=new long[R][(C+63)/64];
        for(int i=0;i<R;i++){
            for(int j=0;j<(C+63)/64; j++){
                dp[i][j]=map[i][j];//All positions are reachable with 0 moves
            }
        }	
      
        
        for (int i = 0; i < M; i++) {
            if(s.charAt(i)=='E'){//Shift right
                for (int j = 0; j < R; j++) {
                    
                    shift(dp[j],1,j);
                    dp[j]=ans.clone();
                }
            }else if(s.charAt(i)=='W'){
                for (int j = 0; j < R; j++) {
                    
                    shift(dp[j],-1,j);
                    dp[j]=ans.clone();
                }
            }else if(s.charAt(i)=='N'){
                for (int j = 0; j < R-1; j++) {
                    for (int k = 0; k <(C+63)/64; k++) {
                        dp[j][k]=dp[1+j][k]&map[j][k];
                    }
                }
                Arrays.fill(dp[R-1],0);
                
            }else if(s.charAt(i)=='S'){
                for (int j = R-1; j > 0; j--) {
                   
                    
                    for (int k = 0; k <(C+63)/64; k++) {
                        dp[j][k]=dp[j-1][k]&map[j][k];
                    }
                }
                
                Arrays.fill(dp[0],0);
                
            }else{//Take the OR of all four, then AND the map
                long[][] a=new long[R][(C+63)/64];
                
                for (int j = 0; j <R; j++) {
                    
                    shift(dp[j],1,j);
                    a[j]=ans.clone();
                    
                    shift(dp[j],-1,j);
                    for (int k = 0; k < (C+63)/64;k++) {
                        a[j][k]|=ans[k];
                    }
                    if(j>0){
                        for (int k = 0; k <(C+63)/64; k++) {
                            a[j][k]|=dp[j-1][k];
                        }
                    }
                    if(j<R-1){
                        for (int k = 0; k <(C+63)/64; k++) {
                            a[j][k]|=dp[j+1][k];
                        }
                    }
                    //Do I need to make a[.][k] 0? No! They would not be affected because I have ORed them with the correct stuff.
                    for (int k = 0; k <(C+63)/64; k++) {
                        a[j][k]&=map[j][k];
                    }
                }
                for(int k=0;k<R;k++){
	for(int j=0;j<(C+63)/64; j++){
                            dp[k][j]=a[k][j];
	}
                }
            }
            
        }
        int res=0;
        for (int i = 0; i < R; i++) {
            for (int j = 0; j <(C+63)/64; j++) {
                
                res+=Long.bitCount(dp[i][j]);
            }
        }
        System.out.println(res);
    }
    public static void shift(long[] a, int c, int ind){
        int len=(63+C)/64; ans=new long[len];
        if(c==1){
            long x=(long) 1<<63;
            for (int i = 0; i < len-1; i++) {
                long b=a[i]&(x-1);
                ans[i]|=((long) b<<1);
                long d=a[i]>>>63;//3>'s, 2>'s don't work
                ans[i+1]|=d;
            }
            //Take care of last bit
            ans[len-1]|=(a[len-1]<<1);
        }else{//c=-1
            ans[0]=a[0]>>>1;
            for (int i = 1; i < len; i++) {
                long b=a[i]&1;
                ans[i-1]|=((long)b<<63);
                ans[i]|=a[i]>>>1;
            }
        }
        for (int i = 0; i <(C+63)/64; i++) {
            ans[i]&=map[ind][i];
        }
        
    }
}
//Debugging:
//Are you sure your algorithm is correct?
//Bounds: long
//Special cases: n=0,1?
//Make sure you remove your debugging code before you submit!

Subtask #1
29.0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 129 ms 10380 KB Output is correct
2 Correct 130 ms 10648 KB Output is correct
3 Correct 150 ms 10520 KB Output is correct
4 Correct 123 ms 10172 KB Output is correct
5 Correct 141 ms 10324 KB Output is correct
6 Correct 135 ms 10736 KB Output is correct

Subtask #2
37.0 / 37.0

# 결과 실행 시간 메모리 Grader output
1 Correct 129 ms 10380 KB Output is correct
2 Correct 130 ms 10648 KB Output is correct
3 Correct 150 ms 10520 KB Output is correct
4 Correct 123 ms 10172 KB Output is correct
5 Correct 141 ms 10324 KB Output is correct
6 Correct 135 ms 10736 KB Output is correct
7 Correct 132 ms 10796 KB Output is correct
8 Correct 128 ms 10544 KB Output is correct
9 Correct 135 ms 10796 KB Output is correct
10 Correct 134 ms 11052 KB Output is correct
11 Correct 141 ms 10820 KB Output is correct
12 Correct 178 ms 13888 KB Output is correct
13 Correct 166 ms 13656 KB Output is correct
14 Correct 181 ms 13932 KB Output is correct
15 Correct 177 ms 13852 KB Output is correct
16 Correct 166 ms 14000 KB Output is correct
17 Correct 150 ms 12284 KB Output is correct
18 Correct 150 ms 12156 KB Output is correct
19 Correct 167 ms 12296 KB Output is correct
20 Correct 158 ms 12428 KB Output is correct
21 Correct 160 ms 12208 KB Output is correct

Subtask #3
0 / 34.0

# 결과 실행 시간 메모리 Grader output
1 Correct 129 ms 10380 KB Output is correct
2 Correct 130 ms 10648 KB Output is correct
3 Correct 150 ms 10520 KB Output is correct
4 Correct 123 ms 10172 KB Output is correct
5 Correct 141 ms 10324 KB Output is correct
6 Correct 135 ms 10736 KB Output is correct
7 Correct 132 ms 10796 KB Output is correct
8 Correct 128 ms 10544 KB Output is correct
9 Correct 135 ms 10796 KB Output is correct
10 Correct 134 ms 11052 KB Output is correct
11 Correct 141 ms 10820 KB Output is correct
12 Correct 178 ms 13888 KB Output is correct
13 Correct 166 ms 13656 KB Output is correct
14 Correct 181 ms 13932 KB Output is correct
15 Correct 177 ms 13852 KB Output is correct
16 Correct 166 ms 14000 KB Output is correct
17 Correct 150 ms 12284 KB Output is correct
18 Correct 150 ms 12156 KB Output is correct
19 Correct 167 ms 12296 KB Output is correct
20 Correct 158 ms 12428 KB Output is correct
21 Correct 160 ms 12208 KB Output is correct
22 Correct 695 ms 21644 KB Output is correct
23 Correct 618 ms 20688 KB Output is correct
24 Correct 625 ms 20464 KB Output is correct
25 Correct 671 ms 20776 KB Output is correct
26 Correct 729 ms 22048 KB Output is correct
27 Correct 852 ms 21396 KB Output is correct
28 Correct 835 ms 20748 KB Output is correct
29 Correct 838 ms 20568 KB Output is correct
30 Correct 845 ms 20480 KB Output is correct
31 Correct 897 ms 22220 KB Output is correct
32 Correct 954 ms 20388 KB Output is correct
33 Correct 930 ms 19112 KB Output is correct
34 Correct 945 ms 19084 KB Output is correct
35 Correct 953 ms 19272 KB Output is correct
36 Execution timed out 1047 ms 21604 KB Time limit exceeded