Submission #804549

#	Time	Username	Problem	Language	Result	Execution time	Memory
804549		Benmath	Ancient Books (IOI17_books)	C++14	50 / 100	97 ms	21724 KiB

books

#include "books.h"

#include <bits/stdc++.h>

using namespace std;
long long minimum_walk(std::vector<int> p, int s) {
	long long int sum=0;
	int n=p.size();
	int vis[n];
	for(int i=0;i<n;i++){
	    vis[i]=0;
	}
long long	int sad=0;
vector<pair<int,int> >v;
	for(int i=0;i<n;i++){
	    if(vis[i]==0 and i!=p[i]){
	        int maxi=i;
	        sad=i;
	        int i1=i;
	        int t1=0;
	        long long int iduci=p[i];
	        long long int tren=i;
	        while(t1==0){
	            sum=sum+abs(iduci-tren);
	            vis[tren]++;
	            if(tren>maxi){
	                maxi=tren;
	            }
	            tren=iduci;
	            iduci=p[tren];
	            if(tren==i1){
	                break;
	            }
	        }
	        v.push_back({i,maxi});
	    }
	}
	int m=v.size();
	if(m==0){
	    return 0;
	}
	int so[m];
	so[0]=v[0].second;
	for(int i=1;i<m;i++){
	    so[i]=max(so[i-1],v[i].second);
	}
	sad=0;
	for(int i=v.size()-1;i>=0;i--){
	   long long int x=v[i].first;
	   long long int maxi1=0;
	    int t1=0;
	    if(i!=0){
	        maxi1=so[i-1];
	    }
	    
	   long long int zero=0;
	        sum=sum+2*max((x-maxi1),zero);
	         
	    
	}

	return sum;
}

Compilation message (stderr)

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:51:10: warning: unused variable 't1' [-Wunused-variable]
   51 |      int t1=0;
      |          ^~
books.cpp:13:15: warning: variable 'sad' set but not used [-Wunused-but-set-variable]
   13 | long long int sad=0;
      |               ^~~

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