Submission #1080719

#	Time	Username	Problem	Language	Result	Execution time	Memory
1080719		andrei_iorgulescu	Ancient Books (IOI17_books)	C++14	0 / 100	1 ms	1372 KiB

books

#include <bits/stdc++.h>
#include "books.h"
#warning That's not FB, that's my FB

using namespace std;

using ll = long long;

int n, s;
int p[1000005], pos[1000005];
vector<vector<int>> cyc;
vector<int> cur;
bool viz[1000005];

void dfs(int nod)
{
    viz[nod] = true;
    cur.push_back(nod);
    if (!viz[p[nod]])
        dfs(p[nod]);
}

ll minimum_walk(vector<int> PERM, int STR)
{
    cyc.clear();
    memset(viz,0,sizeof(viz));
    n = PERM.size();
    for (int i = 1; i <= n; i++)
        p[i] = PERM[i - 1] + 1, pos[p[i]] = i;
    s = STR;
    for (int i = 1; i <= n; i++)
    {
        if (!viz[i])
        {
            cur.clear();
            dfs(i);
            cyc.push_back(cur);
        }
    }
    ll ans = 0;
    for (int i = 1; i <= n; i++)
        ans += abs(i - p[i]);
    int adg = 0;
    int mxm = 0;
    int ult = 1;
    for (int i = 1; i <= n; i++)
    {
        if (mxm == i - 1 and i != 1)
            adg += 2;
        mxm = max(mxm, p[i]);
    }
    ans += adg;
    int pzz = n;
    while (pzz != 0 and p[pzz] == pzz)
        ans -= 2, pzz--;
    return ans;
}

Compilation message (stderr)

books.cpp:3:2: warning: #warning That's not FB, that's my FB [-Wcpp]
    3 | #warning That's not FB, that's my FB
      |  ^~~~~~~
books.cpp: In function 'll minimum_walk(std::vector<int>, int)':
books.cpp:45:9: warning: unused variable 'ult' [-Wunused-variable]
   45 |     int ult = 1;
      |         ^~~

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