Submission #496569

#	Time	Username	Problem	Language	Result	Execution time	Memory
496569		kingline	Nautilus (BOI19_nautilus)	C++17	100 / 100	175 ms	644 KiB

nautilus

/*#pragma GCC optimize("O3")
#pragma GCC target ("avx2")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize("unroll-loops")*/
#include <bits/stdc++.h>
#define file(data) freopen(data".in", "r", stdin); freopen(data".out", "w", stdout);
#define pb push_back
#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define all(data) data.begin() , data.end()
#define endl '\n'
//freopen("nenokku_easy.in", "r", stdin);
//freopen("nenokku_easy.out", "w", stdout);
//#define int long long
#define pii pair < int, int >

using namespace std;

typedef long long ll;
const int N = 2e5;

int r, C, m;
char c[505][505];
string s;

main() {
    /*ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);*/
    //file("pieaters");
    cin >> r >> C >> m;
    bitset < 501 > b[505], bad[505], zer, last[505];
    for(int i = 1; i <= r; i++) {
        for(int j = 1; j <= C; j++) {
            cin >> c[i][j];
            bad[i][j] = (c[i][j] == '.');
            b[i][j] = (c[i][j] == '.');
        }
    }
    cin >> s;
    for(int k = 0; k < s.size(); k++) {
        if(s[k] == 'W') {
            for(int i = 1; i <= r; i++) {
                b[i] >>= 1;
                b[i] &= bad[i];
            }
        }
        if(s[k] == 'E') {
            for(int i = 1; i <= r; i++) {
                b[i] <<= 1;
                b[i] &= bad[i];
            }
        }
        if(s[k] == 'N') {
            for(int i = 1; i < r; i++) {
                b[i] = b[i + 1] & bad[i];
            }
            b[r] = zer;
        }
        if(s[k] == 'S') {
            for(int i = r; i > 1; i--) {
                b[i] = b[i - 1] & bad[i];
            }
            b[1] = zer;
        }
        if(s[k] == '?') {
            for (int i = 1; i <= r; i++) {
                last[i] = b[i];
            }
            for(int i = 1; i <= r; i++) {
                b[i] = ((b[i] << 1) | (b[i] >> 1) | last[i + 1] | last[i - 1]);
                b[i] &= bad[i];
            }
        }
    }
    int ans = 0;
    for(int i = 1; i <= r; i++) {
        ans += b[i].count();
    }
    cout << ans;
}

/*
5 9 7
...##....
..#.##..#
..#....##
.##...#..
....#....
WS?EE??
*/

Compilation message (stderr)

nautilus.cpp:26:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   26 | main() {
      | ^~~~
nautilus.cpp: In function 'int main()':
nautilus.cpp:41:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |     for(int k = 0; k < s.size(); k++) {
      |                    ~~^~~~~~~~~~

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