Submission #101827

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
101827	2019-03-20 12:13:35	KCSC	Snake Escaping (JOI18_snake_escaping)	C++14	100 / 100	1161 ms	43076 KiB

snake_escaping

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#include <bits/stdc++.h>
using namespace std;
const int DIM = 20;
char str[1 << DIM], aux[DIM];
int udp[1 << DIM], ddp[1 << DIM], cbit[1 << DIM];
int main(void) {
#ifdef HOME
  freopen("snake.in", "r", stdin);
  freopen("snake.out", "w", stdout);
#endif
  int n, q; scanf("%d %d\n%s\n", &n, &q, str);
  for (int msk = 0; msk < (1 << n); ++msk) {
    cbit[msk] = cbit[msk >> 1] + (msk & 1);
    udp[msk] = ddp[msk] = str[msk] - '0'; }
  for (int b = 0; b < n; ++b) {
    for (int msk = 0; msk < (1 << n); ++msk) {
      if (msk & (1 << b)) {
        udp[msk ^ (1 << b)] += udp[msk]; }
      else {
        ddp[msk ^ (1 << b)] += ddp[msk]; } } }
  while (q--) {
    int msk0 = 0, msk1 = 0, mskq = 0; 
    scanf("%s\n", aux); reverse(aux, aux + n);
    for (int i = 0; i < n; ++i) {
      if (aux[i] == '0') { msk0 ^= (1 << i); } 
      if (aux[i] == '1') { msk1 ^= (1 << i); }
      if (aux[i] == '?') { mskq ^= (1 << i); } }
 
 
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Compilation message (stderr)

snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:14:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int n, q; scanf("%d %d\n%s\n", &n, &q, str);
            ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
snake_escaping.cpp:26:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s\n", aux); reverse(aux, aux + n);
   ~~~~~^~~~~~~~~~~~~

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