Submission #1144132

#	Time	Username	Problem	Language	Result	Execution time	Memory
1144132		SmuggingSpun	Snake Escaping (JOI18_snake_escaping)	C++20	5 / 100	2096 ms	2528 KiB

snake_escaping

#include<bits/stdc++.h>
#define taskname "E"
using namespace std;
int LOG, n, q;
string toxic;
namespace sub1{
	void solve(){
		for(int _ = 0; _ < q; _++){
			int ans = 0;
			string s;
			cin >> s;
			reverse(s.begin(), s.end());
			for(int mask = n - 1; mask > -1; mask--){
				ans += toxic[mask];
				for(int i = 0; i < LOG; i++){
					if(s[i] != '?' && bool(1 << i & mask) != bool(s[i] == '1')){
						ans -= toxic[mask];
						break;
					}
				}
			}
			cout << ans << "\n";
		}
	}
}
namespace sub2{
	void solve(){
		unordered_map<string, int>ans;
		for(int mask = n - 1; mask > -1; mask--){
			for(int sub = n - 1; sub > -1; sub--){
				string s = "";		
				for(int i = 0; i < LOG; i++){
					if(1 << i & sub){
						s += char((1 << i & mask) ? 49 : 48);
					}
					else{
						s += '?';
					}
				}
				ans[s] += toxic[mask];
			}
		}
		for(int _ = 0; _ < q; _++){
			string s;
			cin >> s;
			reverse(s.begin(), s.end());
			cout << ans[s] << "\n";
		}
	}
}
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	if(fopen(taskname".inp", "r")){
		freopen(taskname".inp", "r", stdin);
	}
	cin >> LOG >> q >> toxic;
	for(char& c : toxic){
		c -= 48;
	}
	if((n = 1 << LOG) <= 1024){
		sub1::solve();
	}
	else if(n <= 8192){
		sub2::solve();
	}
}

Compilation message (stderr)

snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:54:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |                 freopen(taskname".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 10
• Subtask 4: 0 / 53
• Subtask 5: 0 / 25