oj.uz

Submission #67943

# Submission time Handle Problem Language Result Execution time Memory
67943 2018-08-15T14:57:42 Z funcsr Sorting (IOI15_sorting) C++17
74 / 100
 463 ms 13328 KB 
#include "sorting.h"
#include <iostream>
#include <algorithm>
#include <vector>
#include <cassert>
using namespace std;
#define rep(i, n) for (int i=0; i<(n); i++)
#define pb push_back
#define _1 first
#define _2 second

int S[200000];
bool used[200000];
vector<pair<int, int> > f(int R, int N, int SS[], int X[], int Y[]) {
  rep(i, N) S[i] = SS[i];
  rep(i, R) swap(S[X[i]], S[Y[i]]);
  rep(i, N) used[i] = false;
  vector<pair<int, int> > ret;
  rep(s, N) if (!used[s]) {
    vector<int> seq;
    int v = s;
    used[v] = true;
    seq.pb(v);
    while (true) {
      v = S[v];
      if (v == s) break;
      assert(!used[v]);
      seq.pb(v);
      used[v] = true;
    }
    for (int i=seq.size()-1; i>0; i--) ret.pb(make_pair(seq[0], seq[i]));
  }
  if (ret.size() > R) return {};
  return ret;
}

int rev[200000];
void swapV(int a, int b) {
  swap(rev[S[a]], rev[S[b]]);
  swap(S[a], S[b]);
}
int findSwapPairs(int N, int SS[], int M, int X[], int Y[], int P[], int Q[]) {
  if (is_sorted(SS, SS+N)) return 0;
  int lo = 0, hi = M;
  while (hi-lo>1) {
    int mid = (lo+hi)/2;
    if (!f(mid, N, SS, X, Y).empty()) hi = mid;
    else lo = mid;
  }
  int R = hi;
  vector<pair<int,int> > swaps = f(R, N, SS, X, Y);
  assert(swaps.size() <= R);
  //cout<<"R="<<R<<": swaps={";for(auto p:swaps)cout<<p._1<<"<->"<<p._2<<",";cout<<"}\n";
  rep(i, N) S[i] = SS[i], rev[SS[i]] = i;
  rep(i, R) {
    swapV(X[i], Y[i]);
    if (i < swaps.size()) P[i] = rev[swaps[i]._1], Q[i] = rev[swaps[i]._2];
    else P[i] = Q[i] = 0;
    swapV(P[i], Q[i]);
  }
  return R;
}

Compilation message

sorting.cpp: In function 'std::vector<std::pair<int, int> > f(int, int, int*, int*, int*)':
sorting.cpp:31:26: warning: conversion to 'int' from 'std::vector<int>::size_type {aka long unsigned int}' may alter its value [-Wconversion]
     for (int i=seq.size()-1; i>0; i--) ret.pb(make_pair(seq[0], seq[i]));
                ~~~~~~~~~~^~
sorting.cpp:33:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (ret.size() > R) return {};
       ~~~~~~~~~~~^~~
In file included from /usr/include/c++/7/cassert:44:0,
                 from sorting.cpp:5:
sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   assert(swaps.size() <= R);
          ~~~~~~~~~~~~~^~~~
sorting.cpp:57:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if (i < swaps.size()) P[i] = rev[swaps[i]._1], Q[i] = rev[swaps[i]._2];
         ~~^~~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 3 ms 432 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 3 ms 432 KB Output is correct
8 Correct 2 ms 256 KB Output is correct
9 Correct 2 ms 256 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 3 ms 384 KB Output is correct
12 Correct 3 ms 384 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 256 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 3 ms 432 KB Output is correct
8 Correct 2 ms 256 KB Output is correct
9 Correct 2 ms 256 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 3 ms 384 KB Output is correct
12 Correct 3 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 2 ms 384 KB Output is correct
17 Correct 2 ms 384 KB Output is correct
18 Correct 2 ms 256 KB Output is correct
19 Correct 3 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 3 ms 512 KB Output is correct
22 Correct 3 ms 512 KB Output is correct
23 Correct 3 ms 512 KB Output is correct
24 Correct 4 ms 512 KB Output is correct
25 Correct 3 ms 512 KB Output is correct
26 Correct 3 ms 512 KB Output is correct
27 Correct 3 ms 512 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 512 KB Output is correct
2 Correct 3 ms 512 KB Output is correct
3 Correct 3 ms 512 KB Output is correct
4 Correct 3 ms 384 KB Output is correct
5 Correct 4 ms 512 KB Output is correct
6 Correct 4 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 3 ms 512 KB Output is correct
9 Correct 3 ms 512 KB Output is correct
10 Correct 4 ms 548 KB Output is correct
11 Correct 3 ms 384 KB Output is correct
12 Correct 3 ms 512 KB Output is correct
13 Correct 3 ms 512 KB Output is correct
14 Correct 3 ms 384 KB Output is correct

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 512 KB Output is correct
2 Correct 3 ms 512 KB Output is correct
3 Correct 3 ms 512 KB Output is correct
4 Correct 3 ms 384 KB Output is correct
5 Correct 4 ms 512 KB Output is correct
6 Correct 4 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 3 ms 512 KB Output is correct
9 Correct 3 ms 512 KB Output is correct
10 Correct 4 ms 548 KB Output is correct
11 Correct 3 ms 384 KB Output is correct
12 Correct 3 ms 512 KB Output is correct
13 Correct 3 ms 512 KB Output is correct
14 Correct 3 ms 384 KB Output is correct
15 Correct 332 ms 11800 KB Output is correct
16 Correct 342 ms 12464 KB Output is correct
17 Correct 344 ms 13028 KB Output is correct
18 Correct 40 ms 5368 KB Output is correct
19 Correct 403 ms 11312 KB Output is correct
20 Correct 349 ms 11808 KB Output is correct
21 Correct 313 ms 11732 KB Output is correct
22 Correct 243 ms 12872 KB Output is correct
23 Correct 328 ms 13328 KB Output is correct
24 Correct 334 ms 12924 KB Output is correct
25 Correct 359 ms 12900 KB Output is correct
26 Correct 363 ms 10172 KB Output is correct
27 Correct 283 ms 9824 KB Output is correct
28 Correct 343 ms 12956 KB Output is correct
29 Correct 463 ms 12152 KB Output is correct
30 Correct 327 ms 8852 KB Output is correct
31 Correct 369 ms 12264 KB Output is correct
32 Correct 321 ms 13080 KB Output is correct
33 Correct 365 ms 12692 KB Output is correct
34 Correct 333 ms 12620 KB Output is correct
35 Correct 407 ms 11380 KB Output is correct
36 Incorrect 193 ms 7644 KB Output isn't correct
37 Halted 0 ms 0 KB -