Submission #514799

#	Time	Username	Problem	Language	Result	Execution time	Memory
514799		ymm	Nautilus (BOI19_nautilus)	C++17	100 / 100	185 ms	680 KiB

nautilus

///
///   What would happen if we used assembly language for CP?
///   Sorry, that was a strange thing to ask.
///

#include <bits/stdc++.h>
#define Loop(x,l,r) for(ll x = ll(l); x < ll(r); ++x)
#define LoopR(x,l,r) for(ll x = ll(r)-1; x >= ll(l); --x)
#define Kill(x) exit((cout << (x) << '\n', 0))
typedef long long ll;
typedef std::pair<int,int> pii;
typedef std::pair<ll,ll> pll;
using namespace std;

const int N = 510;
bitset<N> cur[2][N];
bitset<N> isl[N];
int n, m, k;

void up(char c){
	Loop(i,0,n){
		cur[1][i].reset();
		if( c=='?' || c=='E') {cur[1][i] |= cur[0][i]<<1; cur[1][i][m]=0;}
		if( c=='?' || c=='W')  cur[1][i] |= cur[0][i]>>1;
		if((c=='?' || c=='N') && i+1<n) cur[1][i] |= cur[0][i+1];
		if((c=='?' || c=='S') && i  >0) cur[1][i] |= cur[0][i-1];
		cur[1][i] &= isl[i];
	}
	Loop(i,0,n) cur[0][i] = cur[1][i];
}

int main()
{
	cin.tie(0) -> sync_with_stdio(false);
	cin >> n >> m >> k;
	Loop(i,0,n) Loop(j,0,m){
		char c;
		cin >> c;
		isl[i][j] = cur[0][i][j] = c=='.';
	}
	Loop(i,0,k){
		char c;
		cin >> c;
		up(c);
	}
	int ans = 0;
	Loop(i,0,n) ans += cur[0][i].count();
	cout << ans << '\n';
}

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