Submission #334278

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
334278	2020-12-08 22:55:21	ChrisT	Snake Escaping (JOI18_snake_escaping)	C++17	100 / 100	1865 ms	65536 KiB

snake_escaping

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#include <bits/stdc++.h>
using namespace std;
int val[1 << 20], sum1[1 << 20], sum2[1 << 20], nmask[1 << 6]; 
vector<int> pre[1 << 20];
char str[25];
int main() { //nut
  int n,q;
  scanf ("%d %d",&n,&q);
  for (int i = 0; i < (1 << n); i++) {
    char ch; scanf (" %c",&ch); 
    sum2[((1 << n) - 1) ^ i] = sum1[i] = val[i] = ch - '0';
  }
  for (int i = 0; i < n; i++) {
    for (int mask = 0; mask < (1 << n); mask++) if (mask >> i & 1) {
      sum1[mask] += sum1[mask ^ (1 << i)];
      sum2[mask] += sum2[mask ^ (1 << i)];
    }
  }
  for (int mask = 0; mask < (1 << n); mask++) if (__builtin_popcount(mask) <= n/3) {
    vector<int> pos;
    for (int i = 0; i < n; i++) if (mask >> i & 1) pos.push_back(i);
    for (int mask2 = 0; mask2 < (1 << (int)pos.size()); mask2++) {
      int nmask = 0;
      for (int i = 0; i < (int)pos.size(); i++) if (mask2 >> i & 1) nmask |= (1 << pos[i]);
      pre[mask].push_back(nmask);
    }
  }
  while (q--) {
    scanf ("%s",str);
    reverse(str,str+n);
 
 
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Compilation message (stderr)

snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:8:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |  scanf ("%d %d",&n,&q);
      |  ~~~~~~^~~~~~~~~~~~~~~
snake_escaping.cpp:10:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |   char ch; scanf (" %c",&ch);
      |            ~~~~~~^~~~~~~~~~~
snake_escaping.cpp:29:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   29 |   scanf ("%s",str);
      |   ~~~~~~^~~~~~~~~~

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