oj.uz

Submission #116620

# Submission time Handle Problem Language Result Execution time Memory
116620 2019-06-13T06:46:40 Z dragonslayerit Dancing Elephants (IOI11_elephants) C++14
100 / 100
 4974 ms 6996 KB 
#include "elephants.h"
#include <vector>
#include <algorithm>
#include <cstdio>

const int INF=1e9+7;
const int BLK_SIZE=400;
const int PERIOD=700;

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 3 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 3 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 168 ms 1404 KB Output is correct
8 Correct 189 ms 1492 KB Output is correct
9 Correct 325 ms 2280 KB Output is correct
10 Correct 389 ms 2492 KB Output is correct
11 Correct 398 ms 2452 KB Output is correct
12 Correct 603 ms 2712 KB Output is correct
13 Correct 387 ms 2404 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 3 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 168 ms 1404 KB Output is correct
8 Correct 189 ms 1492 KB Output is correct
9 Correct 325 ms 2280 KB Output is correct
10 Correct 389 ms 2492 KB Output is correct
11 Correct 398 ms 2452 KB Output is correct
12 Correct 603 ms 2712 KB Output is correct
13 Correct 387 ms 2404 KB Output is correct
14 Correct 268 ms 1912 KB Output is correct
15 Correct 326 ms 1988 KB Output is correct
16 Correct 1068 ms 3028 KB Output is correct
17 Correct 1202 ms 3676 KB Output is correct
18 Correct 1268 ms 3540 KB Output is correct
19 Correct 720 ms 3340 KB Output is correct
20 Correct 1164 ms 3648 KB Output is correct
21 Correct 1280 ms 3580 KB Output is correct
22 Correct 759 ms 3408 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 3 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 168 ms 1404 KB Output is correct
8 Correct 189 ms 1492 KB Output is correct
9 Correct 325 ms 2280 KB Output is correct
10 Correct 389 ms 2492 KB Output is correct
11 Correct 398 ms 2452 KB Output is correct
12 Correct 603 ms 2712 KB Output is correct
13 Correct 387 ms 2404 KB Output is correct
14 Correct 268 ms 1912 KB Output is correct
15 Correct 326 ms 1988 KB Output is correct
16 Correct 1068 ms 3028 KB Output is correct
17 Correct 1202 ms 3676 KB Output is correct
18 Correct 1268 ms 3540 KB Output is correct
19 Correct 720 ms 3340 KB Output is correct
20 Correct 1164 ms 3648 KB Output is correct
21 Correct 1280 ms 3580 KB Output is correct
22 Correct 759 ms 3408 KB Output is correct
23 Correct 2835 ms 6208 KB Output is correct
24 Correct 3092 ms 6232 KB Output is correct
25 Correct 2477 ms 6072 KB Output is correct
26 Correct 3291 ms 6316 KB Output is correct
27 Correct 3526 ms 6216 KB Output is correct
28 Correct 1169 ms 2420 KB Output is correct
29 Correct 1094 ms 2304 KB Output is correct
30 Correct 1137 ms 2308 KB Output is correct
31 Correct 1105 ms 2336 KB Output is correct
32 Correct 3478 ms 6192 KB Output is correct
33 Correct 3351 ms 6272 KB Output is correct
34 Correct 3288 ms 6244 KB Output is correct
35 Correct 2912 ms 6396 KB Output is correct
36 Correct 2549 ms 6200 KB Output is correct
37 Correct 4340 ms 6620 KB Output is correct
38 Correct 3518 ms 6216 KB Output is correct
39 Correct 3249 ms 6180 KB Output is correct
40 Correct 3767 ms 6332 KB Output is correct
41 Correct 4726 ms 6872 KB Output is correct
42 Correct 4974 ms 6996 KB Output is correct