Submission #1196373

#	Time	Username	Problem	Language	Result	Execution time	Memory
1196373		dosts	Gondola (IOI14_gondola)	C++20	55 / 100	34 ms	6728 KiB

gondola

#include "gondola.h"
#include <bits/stdc++.h>
#pragma GCC target("lzcnt,popcnt")
#pragma GCC optimize("O3,unroll-loops")
#define int long long
#define pii pair<int,int>
#define vi vector<int>
#define ff first
#define ss second
#define all(x) x.begin(),x.end()
#define sp << " " << 
using namespace std;


int32_t valid(int32_t n, int32_t inputSeq[])
{
  map<int,int> saw;
  vi pos(n+1,-1);
  for (int i=0;i<n;i++) {
    if (saw.count(inputSeq[i])) return 0;
    saw[inputSeq[i]] = 1;
    if (inputSeq[i] <= n) {
      pos[inputSeq[i]] = i;
    }
  }
  int frst = -1;
  int lst = -1,lsty = -1;
  for (int j = 1;j<=n;j++) {
    if (pos[j] == -1) continue;
    if (frst == -1) frst = pos[j];
    pos[j] = (pos[j]-frst+n)%n;
    if (lst != -1 && pos[j]-lst != j-lsty) return 0;
    lst = pos[j];
    lsty = j;
  }
  return 1;
}

//----------------------

int32_t replacement(int32_t n, int32_t gondolaSeq[], int32_t replacementSeq[])
{
  int cur = n;
  vi inds(n+1);
  vi a(n+1);
  iota(all(a),0ll);
  int frst = -1;
  for (int i=1;i<=n;i++) {
    if (gondolaSeq[i-1] <= n) frst = i;
  }
  if (frst != -1) {
    a[frst] = gondolaSeq[frst-1];
    for (int j = frst+1;j<=n;j++) a[j] = a[j-1]%n+1;
    for (int j = frst-1;j>=1;j--) a[j] = (a[j+1]==1)?n:(a[j+1]-1);
  }
  iota(all(inds),0ll);
  sort(1+all(inds),[&](int x,int y) {
    return gondolaSeq[x-1] < gondolaSeq[y-1];
  });
  int ptr = 0;
  for (int i = 1;i<=n;i++) {
    int ind = inds[i];
    while (gondolaSeq[ind-1] > a[ind]) {
      replacementSeq[ptr++] = a[ind];
      a[ind] = ++cur;
    }
  }
  return ptr;
}

//----------------------
const int MOD = 1e9+9;
int mult(int x,int y) {
  return (x*y)%MOD;
}
int expo(int x,int y) {
  if (!y) return 1;
  int e = expo(x,y>>1);
  e = mult(e,e);
  if (y&1) e = mult(e,x);
  return e;
}

int32_t countReplacement(int32_t n, int32_t inputSeq[])
{
  int ans = valid(n,inputSeq);
  vi inds(n+1);
  iota(all(inds),0ll);
  sort(1+all(inds),[&](int x,int y) {
    return inputSeq[x-1] < inputSeq[y-1];
  });
  int rem = 0;
  for (int i=1;i<=n;i++) if (inputSeq[i-1] > n) rem++;
  int cur = n;
  for (int i=1;i<=n;i++) {
    int ind = inds[i];
    if (inputSeq[ind-1] <= cur) assert(0);
    ans = mult(ans,expo(rem,(inputSeq[ind-1]-cur-1)));
    cur = inputSeq[ind-1];
    rem--;
  }
  return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 20 / 20
• Subtask 7: 0 / 5
• Subtask 8: 0 / 15
• Subtask 9: 0 / 15
• Subtask 10: 0 / 10