Submission #708120

#	Time	Username	Problem	Language	Result	Execution time	Memory
708120		Cyanmond	Ancient Books (IOI17_books)	C++17	50 / 100	147 ms	16208 KiB

books

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

using i64 = long long;

void chmax(i64 &a, i64 b) {
    if (a < b) a = b;
}

long long minimum_walk(std::vector<int> p, int s) {
    const int n = (int)p.size();
    std::vector<i64> imos(n);
    for (int i = 0; i < n; ++i) {
        int a = i, b = p[i];
        if (a > b) std::swap(a, b);
        ++imos[a];
        --imos[b];
    }
    for (int i = 0; i < n - 1; ++i) imos[i + 1] += imos[i];
    i64 baseCost = std::accumulate(imos.begin(), imos.end(), 0ll);
    i64 x = 0, c = 0;
    for (int i = s; i < n; ++i) {
        if (imos[i] == 0) {
            ++c;
        }
        if (imos[i] != 0) {
            x += c;
            c = 0;
        }
    }
    c = 0;
    for (int i = s - 1; i >= 0; --i) {
        if (imos[i] == 0) {
            ++c;
        }
        if (imos[i] != 0) {
            x += c;
            c = 0;
        }
    }
    return baseCost + 2 * x;
}

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