Submission #945213

#	Time	Username	Problem	Language	Result	Execution time	Memory
945213		PenguinsAreCute	Unscrambling a Messy Bug (IOI16_messy)	C++17	100 / 100	1 ms	636 KiB

messy

#include <bits/stdc++.h>
#include "messy.h"
using namespace std;
void preDnc(int n, int l, int r) {
	string x; for(int i=0;i<n;i++) x+=char((i<l||i>=r)|48);
	int m = l+r>>1;
	for(int i=l;i<m;i++) {
		x[i]='1';
		add_element(x);
		x[i]='0';
	}
	if(r-l>2) {
		preDnc(n,l,m);
		preDnc(n,m,r);
	}
}
void postDnc(int n, int l, int r, vector<int> &perm) {
	vector<int> v(begin(perm)+l,begin(perm)+r);
	string x; for(int i=0;i<n;i++) x+='1'; for(auto i:v) x[i]='0';
	int m = l+r>>1;
	int cur = l, cur2 = m;
	for(auto i: v) {
		x[i] = '1';
		if(check_element(x)) perm[cur++]=i;
		else perm[cur2++]=i;
		x[i] = '0';
	}
	if(r-l>2) {
		postDnc(n,l,m,perm);
		postDnc(n,m,r,perm);
	}
}
std::vector<int> restore_permutation(int n, int w, int r) {
	preDnc(n,0,n);
	compile_set();
	vector<int> perm(n);
	iota(perm.begin(),perm.end(),0);
	postDnc(n,0,n,perm);
	vector<int> perm_inv(n);
	for(int i=0;i<n;i++) perm_inv[perm[i]]=i;
	return perm_inv;
}

Compilation message (stderr)

messy.cpp: In function 'void preDnc(int, int, int)':
messy.cpp:6:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
    6 |  int m = l+r>>1;
      |          ~^~
messy.cpp: In function 'void postDnc(int, int, int, std::vector<int>&)':
messy.cpp:20:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   20 |  int m = l+r>>1;
      |          ~^~

• Subtask 1: 20 / 20
• Subtask 2: 18 / 18
• Subtask 3: 11 / 11
• Subtask 4: 21 / 21
• Subtask 5: 30 / 30