Submission #66983

#	Time	Username	Problem	Language	Result	Execution time	Memory
66983		ekrem	Snake Escaping (JOI18_snake_escaping)	C++98	75 / 100	2051 ms	66560 KiB

snake_escaping

#include <bits/stdc++.h>
#define st first
#define nd second
#define mp make_pair
#define pb push_back
#define N 1600005
using namespace std;

int n, m, a[(1<<20)+10], dp[N], prec[N], cvp[1000005], kaps[3000][200];
char c;
pair < int , int > q[1000005];

int main() {
	// freopen("in.txt", "r", stdin);
	// freopen("out.txt", "w", stdout);

	for(int i = 0; i < 1594323; i++){
		int x = i, crp = 1, ckr = -1, say = 0, bit = 0;
		while(x){
			if(x%3 == 2){
				ckr = crp;
				break;
			}
			bit += (1<<say)*(x%3);
			say++;
			crp *= 3;
			x /= 3;
		}
		if(ckr == -1)
			prec[i] = -bit;
		else
			prec[i] = ckr;
	}

	scanf("%d %d",&n ,&m);

	for(int i = 0; i < (1<<n); i++){
		scanf(" %c",&c);
		a[i] = c - '0';
	}
	
	for(int i = 1; i <= m; i++){
		int say = 0, son = 0, crp = 1;
		long long bit = 0;
		for(int i = 1; i <= n; i++){
			scanf(" %c" ,&c);
			bit *= 3;
			bit += (c == '?') ? 2 : c - '0';
		}
		for(int say = 1; say <= 13; say++){
			son += crp*(bit%3);
			crp *= 3;
			bit/=3;
		}
		// cout << bit << " , " << son << endl;
		q[i] = mp(bit, son);
	}

	for(int i = 0; i < 2187; i++)
		for(int j = 0; j < (1<<7); j++){
			if(i == 0 and j == 0)
				kaps[i][j] = 1;
			else if(i%3 != 2 and i%3 != j%2)
				kaps[i][j] = 0;
			else
				kaps[i][j] = kaps[i/3][j/2];
		}

	for(int i = 0; i < (1<<7); i++){

		for(int j = 0; j < 1594323; j++){
			if(prec[j] <= 0)
				dp[j] = a[i*(1<<13) - prec[j]];
			else
				dp[j] = dp[j - prec[j]] + dp[j - prec[j]*2];
		}

		for(int j = 1; j <= m; j++){
			if(kaps[q[j].st ][i ] ){
				cvp[j] += dp[q[j].nd];
			}
		}
	}
	for(int i = 1; i <= m; i++)
		printf("%d\n",cvp[i]);
	return 0;
}

Compilation message (stderr)

snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:43:7: warning: unused variable 'say' [-Wunused-variable]
   int say = 0, son = 0, crp = 1;
       ^~~
snake_escaping.cpp:35:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&n ,&m);
  ~~~~~^~~~~~~~~~~~~~~~
snake_escaping.cpp:38:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %c",&c);
   ~~~~~^~~~~~~~~~
snake_escaping.cpp:46:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf(" %c" ,&c);
    ~~~~~^~~~~~~~~~~

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