oj.uz

Submission #116619

# Submission time Handle Problem Language Result Execution time Memory
116619 2019-06-13T06:40:57 Z dragonslayerit Dancing Elephants (IOI11_elephants) C++14
100 / 100
 6657 ms 11476 KB 
#include "elephants.h"
#include <vector>
#include <algorithm>
#include <cstdio>

const int INF=1e9+7;
const int BLK_SIZE=400;
const int PERIOD=400;

int n;
int l;
int xs[150005];
int ys[150005];

struct Block{
  std::vector<int> pos;
  std::vector<int> reach;
  std::vector<int> jumps;
  void recalc(){
    reach.resize(pos.size());
    jumps.resize(pos.size());
    int j=pos.size();
    for(int i=(int)pos.size()-1;i>=0;i--){
      while(pos[j-1]>pos[i]+l) j--;
      if(j==(int)pos.size()){
	reach[i]=pos[i]+l;
	jumps[i]=1;
      }else{
	reach[i]=reach[j];
	jumps[i]=jumps[j]+1;
      }
    }
    /*
    fprintf(stderr,"BLOCK\n");
    for(int i=0;i<pos.size();i++){
      fprintf(stderr,"%d: reach %d, jump %d\n",pos[i],reach[i],jumps[i]);
    }
    */
  }
  void apply(int& x,int& cnt){
    auto it=std::upper_bound(pos.begin(),pos.end(),x);
    if(it==pos.end()) return;
    int i=it-pos.begin();
    cnt+=jumps[i];
    x=reach[i];
  }
};
std::vector<Block> blocks;

void rebuild(){
  std::copy(xs,xs+n,ys);
  std::sort(ys,ys+n);
  blocks.clear();
  for(int i=0;i<n;i++){
    if(i%BLK_SIZE==0){
      blocks.emplace_back();
    }
    blocks.back().pos.push_back(ys[i]);
  }
  for(int i=0;i<blocks.size();i++){
    blocks[i].recalc();
  }
}

void init(int N, int L, int X[])
{
  n=N;
  l=L;
  for(int i=0;i<N;i++){
    xs[i]=X[i];
  }
  rebuild();
}

int current_query=0;

int update(int index, int new_val)
{
  int old_val=xs[index];
  xs[index]=new_val;

  //erase old_val
  for(int i=0;i<blocks.size();i++){
    if(blocks[i].pos.back()>=old_val){
      blocks[i].pos.erase(std::lower_bound(blocks[i].pos.begin(),blocks[i].pos.end(),old_val));
      if(!blocks[i].pos.empty()){
	blocks[i].recalc();
      }else{
	blocks.erase(blocks.begin()+i);
      }
      break;
    }
  }
  //insert new_val
  for(int i=0;i<blocks.size();i++){
    if(i==blocks.size()-1||blocks[i+1].pos.front()>new_val){
      blocks[i].pos.insert(std::lower_bound(blocks[i].pos.begin(),blocks[i].pos.end(),new_val),new_val);
      blocks[i].recalc();
      break;
    }
  }
  if(++current_query%PERIOD==0){
    rebuild();
  }
  //rebuild();
  int pos=-INF,cnt=0;
  for(int i=0;i<blocks.size();i++){
    blocks[i].apply(pos,cnt);
  }
  return cnt;
}

Compilation message

elephants.cpp: In function 'void rebuild()':
elephants.cpp:60:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<blocks.size();i++){
               ~^~~~~~~~~~~~~~
elephants.cpp: In function 'int update(int, int)':
elephants.cpp:83:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<blocks.size();i++){
               ~^~~~~~~~~~~~~~
elephants.cpp:95:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<blocks.size();i++){
               ~^~~~~~~~~~~~~~
elephants.cpp:96:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(i==blocks.size()-1||blocks[i+1].pos.front()>new_val){
        ~^~~~~~~~~~~~~~~~~
elephants.cpp:107:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<blocks.size();i++){
               ~^~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 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

Subtask #2
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 384 KB Output is correct

Subtask #3
24.0 / 24.0

# 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 384 KB Output is correct
7 Correct 183 ms 1292 KB Output is correct
8 Correct 213 ms 1464 KB Output is correct
9 Correct 366 ms 2360 KB Output is correct
10 Correct 505 ms 2420 KB Output is correct
11 Correct 716 ms 2548 KB Output is correct
12 Correct 844 ms 2736 KB Output is correct
13 Correct 538 ms 2408 KB Output is correct

Subtask #4
47.0 / 47.0

# 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 384 KB Output is correct
7 Correct 183 ms 1292 KB Output is correct
8 Correct 213 ms 1464 KB Output is correct
9 Correct 366 ms 2360 KB Output is correct
10 Correct 505 ms 2420 KB Output is correct
11 Correct 716 ms 2548 KB Output is correct
12 Correct 844 ms 2736 KB Output is correct
13 Correct 538 ms 2408 KB Output is correct
14 Correct 340 ms 1920 KB Output is correct
15 Correct 485 ms 1916 KB Output is correct
16 Correct 1352 ms 2960 KB Output is correct
17 Correct 1579 ms 5596 KB Output is correct
18 Correct 1669 ms 5536 KB Output is correct
19 Correct 974 ms 5332 KB Output is correct
20 Correct 1554 ms 5436 KB Output is correct
21 Correct 1573 ms 5444 KB Output is correct
22 Correct 968 ms 4760 KB Output is correct

Subtask #5
3.0 / 3.0

# 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 384 KB Output is correct
7 Correct 183 ms 1292 KB Output is correct
8 Correct 213 ms 1464 KB Output is correct
9 Correct 366 ms 2360 KB Output is correct
10 Correct 505 ms 2420 KB Output is correct
11 Correct 716 ms 2548 KB Output is correct
12 Correct 844 ms 2736 KB Output is correct
13 Correct 538 ms 2408 KB Output is correct
14 Correct 340 ms 1920 KB Output is correct
15 Correct 485 ms 1916 KB Output is correct
16 Correct 1352 ms 2960 KB Output is correct
17 Correct 1579 ms 5596 KB Output is correct
18 Correct 1669 ms 5536 KB Output is correct
19 Correct 974 ms 5332 KB Output is correct
20 Correct 1554 ms 5436 KB Output is correct
21 Correct 1573 ms 5444 KB Output is correct
22 Correct 968 ms 4760 KB Output is correct
23 Correct 3583 ms 11240 KB Output is correct
24 Correct 4050 ms 11160 KB Output is correct
25 Correct 3117 ms 11220 KB Output is correct
26 Correct 4198 ms 11188 KB Output is correct
27 Correct 4787 ms 11120 KB Output is correct
28 Correct 1221 ms 5112 KB Output is correct
29 Correct 1156 ms 5240 KB Output is correct
30 Correct 1215 ms 5208 KB Output is correct
31 Correct 1138 ms 5328 KB Output is correct
32 Correct 4582 ms 10748 KB Output is correct
33 Correct 4786 ms 9984 KB Output is correct
34 Correct 4501 ms 10928 KB Output is correct
35 Correct 3907 ms 11160 KB Output is correct
36 Correct 3361 ms 10692 KB Output is correct
37 Correct 6612 ms 11372 KB Output is correct
38 Correct 4822 ms 9928 KB Output is correct
39 Correct 4372 ms 10900 KB Output is correct
40 Correct 4541 ms 9872 KB Output is correct
41 Correct 6569 ms 11256 KB Output is correct
42 Correct 6657 ms 11476 KB Output is correct