Submission #709740

#	Time	Username	Problem	Language	Result	Execution time	Memory
709740		gun_gan	Permutation (APIO22_perm)	C++17	10 / 100	1 ms	340 KiB

perm

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

static long long MX=1e18;

vector<int> construct_permutation(long long k) {
	vector<vector<int>> ans;

	if(k > 31) {
		int last = 0;
		for(int i = 59; i >= 0; i -= 5) {
			ll cur = 0;
			for(int j = i, z = 4; j > i - 5; j--, z--) {
				cur += (k >> j & 1) << z;
			}

			if(cur > 0) {
				ans.push_back({});
				for(int j = 0; j < i - 4; j++) {
					ans.back().push_back(last);
					last++;
				}

				for(int j = 0; j < cur - (i != 4); j++) {
					ans.back().push_back(last + cur - j - 1 - (i != 4));
				}

				last += cur - (i != 4);
			}
			
		}
	} else {
		ans.push_back({});
		for(int i = k - 2; i >= 0; i--) {
			ans.back().push_back(i);
		}
	}

	vector<int> ret;
	reverse(ans.begin(), ans.end());

	for(auto x : ans) {
		for(auto i : x) ret.push_back(i);
	}
	
	return ret;
}

/*
long long count_increasing(vector<int>& v) {
  vector<long long> dp(v.size() + 1, 0);
  dp[0] = 1;
  for (int x : v)
  {
  	for (int i = 0; i <= x; i++)
  	{
  		dp[x+1] += dp[i];
  		dp[x+1] = min(dp[x+1],MX+1);
  	}
  }
  long long result = 0;

  for (int i = 0; i <= (int)v.size(); i++){
  	result += dp[i];
  	result = min(result,MX+1);
  }

  return result;
}

int main() {
	cin.tie(0); ios_base::sync_with_stdio(0);

	// auto v = construct_permutation(100);
	// for(auto x : v) {
	// 	cout << x << " ";
	// }
	// cout << '\n';
	// cout << count_increasing(v);
 
 	for(int i = 2; i <= 1000; i++) {
 		auto v = construct_permutation(i);
 		if(count_increasing(v) != i) {
 			cout << i << '\n';
 			// for(auto x : v) cout << x << " ";
 			// cout << '\n';
 			// break;
 		}
 	}
}
*/

Compilation message (stderr)

perm.cpp:5:18: warning: 'MX' defined but not used [-Wunused-variable]
    5 | static long long MX=1e18;
      |                  ^~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 90