Submission #423052

#	Time	Username	Problem	Language	Result	Execution time	Memory
423052		MDario	Ancient Books (IOI17_books)	C++11	50 / 100	158 ms	9156 KiB

books

#include "books.h"
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define F first
#define S second
long long minimum_walk(vector<int> p, int s){
    ll n=p.size(), r=0, x=0, y=0, z=0;
    bool b[n];
    for(int i=0; i<n; i++){
        b[i]=0;
        if(p[i]==i)b[i]=1;
    }
    for(int i=0; i<n; i++){
        if(!b[i]){
            //cout << z << " ";
            if(i>z){
                r+=2*(i-z);
            }
            r+=p[i]-i;
            y=p[i];
            while(y!=i){
                z=max(z, y);
                b[y]=1;
                r+=abs(p[y]-y);
                y=p[y];
            }
            b[y]=1;
            z=max(z, y);
        }
    }
	return r;
}

Compilation message (stderr)

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:8:25: warning: unused variable 'x' [-Wunused-variable]
    8 |     ll n=p.size(), r=0, x=0, y=0, z=0;
      |                         ^

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