Submission #496378

#	Time	Username	Problem	Language	Result	Execution time	Memory
496378		mansur	Nautilus (BOI19_nautilus)	C++17	66 / 100	23 ms	8444 KiB

nautilus

#include<bits/stdc++.h>	
 
#pragma optimize ("g",on)
#pragma GCC optimize ("inline")
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC optimize ("03")
#pragma GCC target ("sse,sse2,sse3,ssse3,sse4,popcnt,abm,avx2,mmx,fma,avx,tune=native")
#pragma comment(linker, "/stack:200000000")

//01001101 01100001 01101011 01101000 01100001  01100111 01100001 01111001 

using namespace std;

#define all(a) a.begin(), a.end()                                                   
#define rall(a) a.rbegin(), a.rend()
#define ll long long
#define pb push_back
#define sz(a) a.size()
#define nl '\n'
#define popb pop_back()                                                                   
#define ld double
#define ull unsigned long long
#define ff first                                         
#define ss second  
#define fix fixed << setprecision
#define pii pair<int, int>                          
#define E exit (0)
#define int long long
 
const int inf = 1e9, N = 1e6 + 1, mod = 998244353;                    

vector<pii> dir = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};

char c[101][101];

int n, m, r;

int cn[101][101][102];

string s;
           
bool ok(int x, int y) {
	return x >= 1 && x <= n && y >= 1 && y <= m && c[x][y] == '.';
}

bool can(int x, int y, int pos) {
	if (cn[x][y][pos] == 1) return 0;
	if (cn[x][y][pos] == 2) return 1;
	cn[x][y][pos] = 1;
	if (pos == sz(s)) {
		cn[x][y][pos] = 2;
		return 1;
	}
	if (s[pos] == 'N') {
		x--;
		if (ok(x, y) && can(x, y, pos + 1)) {
			cn[x + 1][y][pos] = 2;
			return 1;
		}
	}
	if (s[pos] == 'S') {
		x++;
		if (ok(x, y) && can(x, y, pos + 1)) {
			cn[x - 1][y][pos] = 2;
			return 1;
		}
	}
	if (s[pos] == 'E') {
		y++;
		if (ok(x, y) && can(x, y, pos + 1)) {
			cn[x][y - 1][pos] = 2;
			return 1;
		}
	}
	if (s[pos] == 'W') {
		y--;
		if (ok(x, y) && can(x, y, pos + 1)) {
			cn[x][y + 1][pos] = 2;
			return 1;
		}
	}
	if (s[pos] == '?') {
		for (auto e: dir) {
			x += e.ff, y += e.ss;
			if (ok(x, y) && can(x, y, pos + 1)) {
				cn[x - e.ff][y - e.ss][pos] = 2;
				return 1;
			}
			x -= e.ff, y -= e.ss;
		}
	}
	return 0;
}

main() {                                                         
	//freopen("cowrect.in", "r", stdin);                                                                                     
	//freopen("cowrect.out", "w", stdout);                                                                                     
	ios_base::sync_with_stdio(NULL);                                                                                        
	cin.tie(NULL);
	cin >> n >> m >> r;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= m; j++) cin >> c[i][j];
	}        
	cin >> s;
	reverse(all(s));
	for (auto &e: s) {
		if (e == 'N') e = 'S';
		else if (e == 'S') e = 'N';
		if (e == 'W') e = 'E';
		else if (e == 'E') e = 'W';		
	}
	int ans = 0;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= m; j++) {
			if (c[i][j] == '#') continue;
			if (can(i, j, 0)) ans++;
		}
	}
	cout << ans;
}

Compilation message (stderr)

nautilus.cpp:3: warning: ignoring '#pragma optimize ' [-Wunknown-pragmas]
    3 | #pragma optimize ("g",on)
      | 
nautilus.cpp:9: warning: ignoring '#pragma comment ' [-Wunknown-pragmas]
    9 | #pragma comment(linker, "/stack:200000000")
      | 
nautilus.cpp: In function 'bool can(long long int, long long int, long long int)':
nautilus.cpp:51:10: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |  if (pos == sz(s)) {
      |          ^
nautilus.cpp: At global scope:
nautilus.cpp:96:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   96 | main() {
      | ^~~~

• Subtask 1: 29 / 29
• Subtask 2: 37 / 37
• Subtask 3: 0 / 34