Submission #593991

#	Time	Username	Problem	Language	Result	Execution time	Memory
593991		AlperenT	Ancient Books (IOI17_books)	C++17	50 / 100	142 ms	22744 KiB

books

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

using namespace std;

long long minimum_walk(vector<int> p, int s){
    long long ans = 0, mx = -1, n = p.size();

    vector<long long> arr(n + 1, 0);

    for(int i = 0; i < n; i++){
        arr[min(i, p[i])]++;
        arr[max(i, p[i])]--;
    }

    for(int i = 1; i < n; i++) arr[i] += arr[i - 1];

    for(int i = 0; i < n; i++) if(arr[i]) mx = i;

    return (mx == -1 ? 0ll : accumulate(arr.begin(), arr.begin() + mx + 1, 0ll) + count(arr.begin(), arr.begin() + mx + 1, 0) * 2);
}

Compilation message (stderr)

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:7:15: warning: unused variable 'ans' [-Wunused-variable]
    7 |     long long ans = 0, mx = -1, n = p.size();
      |               ^~~

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