Submission #421173

#	Time	Username	Problem	Language	Result	Execution time	Memory
421173		MarcoMeijer	Ancient Books (IOI17_books)	C++14	50 / 100	182 ms	18772 KiB

books

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

// macros
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> lll;
typedef tuple<int, int, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<iii> viii;
typedef vector<ll> vll;
typedef vector<lll> vlll;
#define REP(a,b,c) for(int a=int(b); a<int(c); a++)
#define RE(a,c) REP(a,0,c)
#define RE1(a,c) REP(a,1,c+1)
#define REI(a,b,c) REP(a,b,c+1)
#define REV(a,b,c) for(int a=int(c-1); a>=int(b); a--)
#define FOR(a,b) for(auto& a : b)
#define all(a) a.begin(), a.end()
#define INF 1e9
#define EPS 1e-9
#define pb push_back
#define popb pop_back
#define fi first
#define se second
#define sz size()
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

ll minimum_walk(vi p, int s) {
    int n = p.size();
    ll ans = 0;
    vi visited; visited.assign(n,0);

    ll rightMost = 0;

    RE(i,n) {
        if(visited[i]) continue;
        if(i == p[i]) continue;
        int u = p[i];
        ans += (ll)abs(i-p[i]);
        if(rightMost < i) ans += (i-rightMost)*2ll;
        while(u != i) {
            visited[u] = 1;
            rightMost = max<ll>(rightMost, u);
            ans += (ll)abs(u - p[u]);
            u = p[u];
        }
    }

	return ans;
}

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