Submission #1273747

#	Time	Username	Problem	Language	Result	Execution time	Memory
1273747		bhnm	Nautilus (BOI19_nautilus)	C++20	100 / 100	167 ms	157208 KiB

nautilus

#include<bits/stdc++.h>

using namespace std;

bitset<505> dp[505][5005];
bitset<505> a[505];

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); 
    int n,m,l;
    cin >> n >> m >> l;
    for(int i=1;i<=n;i++) {
        for(int j=1;j<=m;j++) {
            char c;
            cin >> c;
            a[i] <<= 1;
            if(c=='.') {
                a[i]|=1;
            }
        }
        dp[i][0]=a[i];
    }
    string s;
    cin >> s;
    s='.'+s;
    int ans=0;
    for(int j=1;j<=l;j++) {
        for(int i=1;i<=n;i++) {   
            if(s[j]=='W') {
                dp[i][j]=(dp[i][j-1] << 1) & a[i];
            }
            if(s[j]=='E') {
                dp[i][j]=(dp[i][j-1] >> 1) & a[i];
            }
            if(s[j]=='N') {
                dp[i][j]=dp[i+1][j-1] & a[i];
            }
            if(s[j]=='S') {
                dp[i][j]=dp[i-1][j-1] & a[i];
            }
            if(s[j]=='?') {
                dp[i][j]=((dp[i][j-1] << 1) | (dp[i][j-1] >> 1) | dp[i-1][j-1] | dp[i+1][j-1]) & a[i];
            }
            if(j==l) ans+=dp[i][j].count();
        }
    }
    cout << ans;
    return 0;
}
 

• Subtask 1: 29 / 29
• Subtask 2: 37 / 37
• Subtask 3: 34 / 34