Submission #1047216

#	Time	Username	Problem	Language	Result	Execution time	Memory
1047216		Ahmed57	Ancient Books (IOI17_books)	C++17	50 / 100	86 ms	43744 KiB

books

#include "bits/stdc++.h"
using namespace std;
vector<int> P;
int vis[1000001];
int mn = 1e9 ,mx = -1e9;
void dfs(int i){
    vis[i] = 1;
    mn = min(mn,i);
    mx = max(mx,i);
    if(!vis[P[i]])dfs(P[i]);
}
long long minimum_walk(vector<int> p, int s){
    long long ans = 0;
    int n = p.size();
    P.clear();
    for(int i = 0;i<n;i++){
        vis[i] = 0;
        P.push_back(p[i]);
        ans+=abs(i-p[i]);
    }
    vector<pair<int,int>> lol;
    for(int i = 0;i<n;i++){
        if(!vis[i]){
            mn = 1e9 , mx = -1e9;
            dfs(i);
            lol.push_back({mn,mx});
        }
    }
    sort(lol.begin(),lol.end());
    int R = -1e9;
    int L = -1e9;
    int sz = 0;
    vector<pair<int,int>> nah;
    for(int i = 0;i<lol.size();i++){
        if(R<lol[i].first){
            if(R>=0){
                nah.push_back({L,R});
            }
            R = lol[i].second;
            L = lol[i].first;
            sz++;
        }else{
            R = max(R,lol[i].second);
        }
    }
    nah.push_back({L,R});
    for(int i = nah.size()-1;i>=0;i--){
        if(nah[i].first==nah[i].second){
            sz--;
        }else break;
    }
    ans+=max(0,(sz-1))*2;
    return ans;
}

Compilation message (stderr)

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:34:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |     for(int i = 0;i<lol.size();i++){
      |                   ~^~~~~~~~~~~

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