Submission #362921

#	Time	Username	Problem	Language	Result	Execution time	Memory
362921		aujasvit_datta	Nautilus (BOI19_nautilus)	C++14	29 / 100	5 ms	876 KiB

nautilus

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define mp make_pair
#define pii pair<int, int> 
#define fr first
#define sc second
#define all(a) a.begin(),a.end()
int r,c,m;
string s;
string grid[102];
set <pii> ans;
bool can_happen(int row, int col) {
	int cr = row, cc = col;
	for(int i = 0; i < s.size(); i++) {
		if(s[i] == 'W') {
			if(cc != 0 and grid[cr][cc - 1] != '#') {
				cc--;
			} else {
				return false;
			}
		} else if(s[i] == 'S') {
			if(cr != r and grid[cr + 1][cc] != '#') {
				cr++;
			} else {
				return false;
			}
		} else if(s[i] == 'N') {
			if(cr != 1 and grid[cr - 1][cc] != '#') {
				cr--;
			} else {
				return false;
			}
		} else if(s[i] == 'E') {
			if(cc != c - 1 and grid[cr][cc + 1] != '#') {
				cc++;
			} else {
				return false;
			}
		}
	}
	
	ans.insert(mp(cr,cc));
	return true;
}

int count() {
	for(int i = 1; i <= r; i++) {
		for(int j = 0; j < c; j++) {
			if(grid[i][j] != '#' and can_happen(i, j)) {
				//do nothing
			}
		}
	}
	return ans.size();
}



signed main() {
	ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
	cin >> r >> c >> m;
	for(int i = 1; i <= r; i++) {
		cin >> grid[i];
	}
	cin >> s;

	cout << count();
	return 0;
}

Compilation message (stderr)

nautilus.cpp: In function 'bool can_happen(long long int, long long int)':
nautilus.cpp:16:19: 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]
   16 |  for(int i = 0; i < s.size(); i++) {
      |                 ~~^~~~~~~~~~

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