제출 #283718

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
283718		balbit	고대 책들 (IOI17_books)	C++14	50 / 100	319 ms	20796 KiB

books

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

#define ll long long
#define pii pair<int, int>
#define f first
#define s second

#define ALL(x) (x).begin(), (x).end()
#define SZ(x) (int)((x).size())
#define pb push_back

#ifdef BALBIT
#define bug(...) cerr<<"#"<<__LINE__<<" "<<#__VA_ARGS__<<": ", _do(__VA_ARGS__)
template <typename T> void _do(T && x) {cerr<<x<<endl;}
template <typename T, typename ...S> void _do(T && x, S&&...y) {cerr<<x<<", "; _do(y...);}
#define IOS()
#else
#define bug(...)
#define IOS() ios::sync_with_stdio(0), cin.tie(0)
#define endl '\n'
#endif
const int maxn = 1e6+5;
bool seen[maxn];
int bg[maxn];
bool dv[maxn];

ll minimum_walk(vector<int> p, int s) {
	memset(seen, 0, sizeof seen);
	int n = SZ(p);
	ll re= 0;
	for (int i = 0; i<n; ++i) {
		// --p[i]; 
		re+= abs(i-p[i]);
	}
	for (int i = 0; i<n; ++i) {
		if (!seen[i]) {
			seen[i] = 1;
			bg[i] = i;
			for (int x = p[i]; x != i; x = p[x]) seen[x] = 1, bg[i] = max(bg[i], x);
			for (int x = p[i]; x != i; x = p[x]) bg[x] = bg[i];
			bug(i, bg[i]);
		}
	}
	int nmx = 0;
	re -= 2;
	for (int i = 0; i<n; ++i) {
		nmx = max(nmx, bg[i]);
		if (nmx <= i) {
			re += 2;
			dv[i] = 1;
		}
	}
	for (int i = 0; i<n; ++i) {
		if (p[i] == i && i != s) re -= 2;
		else break;
	}
	for (int i = n-1; i>=0; --i) {
		if (p[i] == i && i != s) re -= 2;
		else break;
	}
	return re;
}

#ifdef BALBIT
signed main(){
	IOS();
	bug(minimum_walk({0,3,2,1},1));
	bug(minimum_walk({3,2,1,0},0));
	bug(minimum_walk({1,0,3,2},0));
}
#endif

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