Submission #296595

#	Time	Username	Problem	Language	Result	Execution time	Memory
296595		Aldas25	Ancient Books (IOI17_books)	C++14	50 / 100	174 ms	12920 KiB

books

#include "books.h"
#include <bits/stdc++.h>

using namespace std;

#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr)
#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
#define REP(n) FOR(O, 1, (n))
#define pb push_back
#define f first
#define s second
typedef long double ld;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<int, pii> piii;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;
typedef vector<piii> viii;

const int MAXN = 1000100;

int n;
//ll d[1100][1100];

/*int par[MAXN], sz[MAXN];
int find (int a) {return par[a] = par[a]==a ? a : find(par[a]);}
bool same (int a, int b) {return find(a) == find(b);}
void unite (int a, int b) {
    a = find(a), b = find (b);
    if (a == b) return;
    par[b] = a;
    sz[a] += sz[b];
}*/

//vector<pair<ll, pii>> edges;

int pref[MAXN];

long long minimum_walk(std::vector<int> p, int s) {
    n = (int)p.size();
    ll ret = 0ll;
    FOR(i,0, n-1) ret += abs(i - p[i]);

    FOR(i, 0, n-1) pref[min(i,p[i])]++, pref[max(i,p[i])]--;

    FOR(i, 1, n-1) pref[i] += pref[i-1];

    ll cur = 0ll;
    //FOR(i, 0, n-1) {
    for (int i = s; i < n-1; i++) {
        if (!pref[i]) cur++;
        else {
            ret += 2*cur;
            cur = 0ll;
        }
    }
    cur = 0ll;
    for (int i = s; i >= 0; i--) {
        if (!pref[i]) cur++;
        else {
            ret += 2*cur;
            cur = 0ll;
        }
    }

	return ret;
}

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