Submission #248868

#	Time	Username	Problem	Language	Result	Execution time	Memory
248868		kostia244	Ancient Books (IOI17_books)	C++17	12 / 100	2116 ms	574984 KiB

books

#include "books.h"
#include<bits/stdc++.h>
using namespace std;
set<tuple<vector<int>, int, int, int>> dp;
int ans = 1<<30, os;
void solve(vector<int> p, int s, int hand, int cur) {
	if(cur > 30) return;
	if(!dp.insert({p, s, hand, cur}).second) return;
	int ok = 1;
	for(int i = 0; i < p.size(); i++) ok &= p[i] == i;
	if(ok&&s==os) ans = min(ans, cur);
	if(s+1 < p.size()) solve(p, s+1, hand, cur+1);
	if(s) solve(p, s-1, hand, cur+1);
	swap(p[s], hand);
	solve(p, s, hand, cur);
}
long long minimum_walk(std::vector<int> p, int s) {
	os = s;
	solve(p, s, -1, 0);
	return ans;
}

Compilation message (stderr)

books.cpp: In function 'void solve(std::vector<int>, int, int, int)':
books.cpp:10:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < p.size(); i++) ok &= p[i] == i;
                 ~~^~~~~~~~~~
books.cpp:12:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(s+1 < p.size()) solve(p, s+1, hand, cur+1);
     ~~~~^~~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 0 / 10
• Subtask 3: 0 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 30