Submission #584529

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
584529	2022-06-27 14:05:23	rainboy	Permutation (APIO22_perm)	C++17	100 / 100	2 ms	340 KiB

perm

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#include "perm.h"
using namespace std;
typedef vector<int> vi;
vi construct_permutation(long long k) {
  vi pp;
  if (k == 2)
    pp.push_back(0);
  else {
    int l = 0;
    while (1LL << l + 1 <= k)
      l++;
    if ((k & 1LL << l - 1) != 0)
      pp.push_back(1), pp.push_back(0), l -= 2;
    else if ((k & 1LL << l - 2) == 0)
      pp.push_back(2), pp.push_back(1), pp.push_back(0), l -= 3;
    else
      pp.push_back(3), pp.push_back(2), pp.push_back(1), pp.push_back(0), l -= 3;
    int n = pp.size();
    while (l > 0) {
      int b = k >> l - 1 & 3;
      if (b == 0)
        pp.push_back(n++), pp.push_back(n++);
      else if (b == 1) {
        pp.push_back(n++), pp.push_back(n++);
        for (int i = 0; i < n; i++)
          pp[i]++;
        pp.push_back(0), n++;
 
 
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Compilation message (stderr)

perm.cpp: In function 'vi construct_permutation(long long int)':
perm.cpp:13:19: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   13 |   while (1LL << l + 1 <= k)
      |                 ~~^~~
perm.cpp:15:21: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   15 |   if ((k & 1LL << l - 1) != 0)
      |                   ~~^~~
perm.cpp:17:26: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   17 |   else if ((k & 1LL << l - 2) == 0)
      |                        ~~^~~
perm.cpp:23:19: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
   23 |    int b = k >> l - 1 & 3;
      |                 ~~^~~

• Subtask 1: 10 / 10
• Subtask 2: 90 / 90