Submission #1192808

#	Time	Username	Problem	Language	Result	Execution time	Memory
1192808		nguyn	Snake Escaping (JOI18_snake_escaping)	C++20	100 / 100	382 ms	21876 KiB

snake_escaping

#include <bits/stdc++.h>
using namespace std;

#define ll long long 
#define F first
#define S second
#define pb push_back 
#define pii pair<int,int>

const int N = (1 << 20);

int l, q; 
int a[N], sosSub[N], sosSup[N];

signed main(){
    ios_base::sync_with_stdio(false) ; 
    cin.tie(0) ; cout.tie(0) ; 
    if (fopen("INP.INP" ,"r")) {
        freopen("INP.INP" ,"r" , stdin) ;
        freopen("OUT.OUT" , "w" , stdout) ;
    }
    cin >> l >> q;
    string s;
    cin >> s;
    for (int i = 0; i < s.size(); i++) {
    	a[i] = sosSub[i] = sosSup[i] = s[i] - '0'; 
    }

    for (int i = 0; i < l; i++) {
        for (int mask = 0; mask < (1 << l); mask++) {
            if (mask & (1 << i)) sosSub[mask] += sosSub[mask ^ (1 << i)];
            else sosSup[mask] += sosSup[mask ^ (1 << i)];
        }
    }
    for (int i = 1; i <= q; i++) {
    	cin >> s;
    	reverse(s.begin(), s.end()); 
    	int maskZ = 0, maskO = 0, maskQ = 0;
    	for (int i = 0; i < s.size(); i++) {
            if (s[i] == '0') maskZ |= (1 << i);
            if (s[i] == '1') maskO |= (1 << i);
            if (s[i] == '?') maskQ |= (1 << i);
        }
        int res = 0;
        if (__builtin_popcount(maskQ) <= 6) {
        	res = a[maskO];
        	for (int sub = maskQ; sub; sub = (sub - 1) & maskQ) {
        		res += a[sub | maskO]; 
        	} 
        }
        else if (__builtin_popcount(maskO) <= 6) {
           	res = sosSub[maskQ] * (__builtin_parity(maskO) ? -1 : 1);
            for (int sub = maskO; sub; sub = (sub - 1) & maskO) {
                if (__builtin_parity(sub) ^ __builtin_parity(maskO)) res -= sosSub[sub | maskQ];
                else res += sosSub[sub | maskQ];
            }
        }
        else if (__builtin_popcount(maskZ) <= 6) {
            res = sosSup[maskO];
            for (int sub = maskZ; sub; sub = (sub - 1) & maskZ) {
                if (__builtin_parity(sub)) res -= sosSup[sub | maskO];
                else res += sosSup[sub | maskO];
            }
        }
        cout << res << "\n";
    }
}

Compilation message (stderr)

snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen("INP.INP" ,"r" , stdin) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
snake_escaping.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen("OUT.OUT" , "w" , stdout) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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