oj.uz

Submission #197089

# Submission time Handle Problem Language Result Execution time Memory
197089 2020-01-18T14:53:15 Z stefdasca Dancing Elephants (IOI11_elephants) C++14
97 / 100
 9000 ms 7848 KB 
#include <bits/stdc++.h>
#include "elephants.h"

using namespace std;
int sqt = 0;
int n, L;
int V[150005];

vector<int> bucket[350];
int DP[150005];
int G[150005];
int pos[150005];
int lastbucket = 0;
int pot = 0;
vector<int> v(n);
void rebuild(bool C)
{
    pot = 0;
    if(C)
        for(int i = 0; i < n; i++)
            v.push_back(i);
    else
    {
        v.clear();
        int last = -1;
        for(int i = 0; i <= lastbucket; i++)
        {
            for(int j = 0; j < bucket[i].size(); j++)
            {
                v.push_back(bucket[i][j]);
                last = bucket[i][j];
            }
            bucket[i].clear();
        }
    }
    int currbucket = 0;
    for(int i = 0; i < n; i++)
    {
        if(bucket[currbucket].size() <= sqt)
            bucket[currbucket].push_back(v[i]);
        else
            bucket[++currbucket].push_back(v[i]);
        pos[v[i]] = currbucket;
        lastbucket = currbucket;
    }
    for(int i = 0; i <= lastbucket; i++)
    {
        int curr = 0;
        int X = bucket[i].size();
        curr = X-1;
        for(int j = X - 1; j >= 0; j--)
        {
            DP[bucket[i][j]] = 1;
            while(curr > j && V[bucket[i][curr - 1]] > (V[bucket[i][j]] + L))
                curr--;
            G[bucket[i][j]] = j;
            if(V[bucket[i][curr]] > (V[bucket[i][j]] + L))
            {
                DP[bucket[i][j]] += DP[bucket[i][curr]];
                G[bucket[i][j]] = G[bucket[i][curr]];
            }
        }
    }
}

void erase_elem(int currbucket, int vl)
{
    vector<int> w;
    for(int i = 0; i < bucket[currbucket].size(); i++)
    {
        if(bucket[currbucket][i] == vl)
            continue;
        w.push_back(bucket[currbucket][i]);
    }
    bucket[currbucket] = w;
    int i = currbucket;
    int X = bucket[i].size();
    int curr = X-1;
    for(int j = X - 1; j >= 0; j--)
    {
        DP[bucket[i][j]] = 1;
        while(curr > j && V[bucket[i][curr - 1]] > (V[bucket[i][j]] + L))
            curr--;
        G[bucket[i][j]] = j;
        if(V[bucket[i][curr]] > (V[bucket[i][j]] + L))
        {
            DP[bucket[i][j]] += DP[bucket[i][curr]];
            G[bucket[i][j]] = G[bucket[i][curr]];
        }
    }
}

void add_elem(int currbucket, int vl)
{
    vector<int> w;
    bool gone = 0;
    pos[vl] = currbucket;
    for(int i = 0; i < bucket[currbucket].size(); i++)
    {
        if(V[bucket[currbucket][i]] >= V[vl] && !gone)
        {
            gone = 1;
            w.push_back(vl);
        }
        w.push_back(bucket[currbucket][i]);
    }
    if(!gone)
        w.push_back(vl);
    swap(bucket[currbucket], w);
    int i = currbucket;
    int X = bucket[i].size();
    int curr = X - 1;
    for(int j = X - 1; j >= 0; j--)
    {
        DP[bucket[i][j]] = 1;
        while(curr > j && V[bucket[i][curr - 1]] > (V[bucket[i][j]] + L))
            curr--;
        G[bucket[i][j]] = j;
        if(V[bucket[i][curr]] > (V[bucket[i][j]] + L))
        {
            DP[bucket[i][j]] += DP[bucket[i][curr]];
            G[bucket[i][j]] = G[bucket[i][curr]];
        }
    }
}

void init(int N, int Lx, int X[])
{
    sqt = 600;
    n = N;
    L = Lx;
    for(int i = 0; i < N ; i++)
        V[i] = X[i];
    rebuild(1);
}

int update(int ix, int yx)
{
    erase_elem(pos[ix],ix);
    int oldd = pos[ix];
    V[ix] = yx;
    int newbucket = lastbucket;
    for(int i = 0; i < lastbucket; i++)
        if(bucket[i+1].size() && V[bucket[i+1].front()] >= yx)
        {
            newbucket = i;
            break;
        }
    add_elem(newbucket, ix);
    pot++;
    if(bucket[oldd].size() == 0 || pot >= sqt)
        rebuild(0);
    int currpos = 0;
    int currbucket = 0;
    int ans = 0;
    while(1)
    {
        ans += DP[bucket[currbucket][currpos]];
        currpos = G[bucket[currbucket][currpos]];
        int ansj = -1;
        int R = V[bucket[currbucket][currpos]] + L;
        for(int j = currbucket + 1; j <= lastbucket; j++)
        {
            if(V[bucket[j].back()] <= R)
                continue;
            else
            {
                ansj = j;
                break;
            }
        }
        if(ansj == -1)
            break;
        else
        {
            currbucket = ansj;
            int l = 0, r = bucket[currbucket].size() - 1;
            int ansj2 = -1;
            while(l <= r)
            {
                int mid = (l + r) / 2;
                if(V[bucket[ansj][mid]] > R)
                {
                    r = mid - 1;
                    ansj2 = mid;
                }
                else
                    l = mid + 1;
            }
            currpos = ansj2;
        }
    }
    return ans;

}

Compilation message

elephants.cpp: In function 'void rebuild(bool)':
elephants.cpp:28:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int j = 0; j < bucket[i].size(); j++)
                            ~~^~~~~~~~~~~~~~~~~~
elephants.cpp:25:13: warning: variable 'last' set but not used [-Wunused-but-set-variable]
         int last = -1;
             ^~~~
elephants.cpp:39:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(bucket[currbucket].size() <= sqt)
            ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
elephants.cpp: In function 'void erase_elem(int, int)':
elephants.cpp:69:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < bucket[currbucket].size(); i++)
                    ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
elephants.cpp: In function 'void add_elem(int, int)':
elephants.cpp:98:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < bucket[currbucket].size(); i++)
                    ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 3 ms 376 KB Output is correct
5 Correct 3 ms 376 KB Output is correct
6 Correct 3 ms 376 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 3 ms 376 KB Output is correct
5 Correct 3 ms 376 KB Output is correct
6 Correct 3 ms 376 KB Output is correct
7 Correct 1177 ms 1520 KB Output is correct
8 Correct 1219 ms 1528 KB Output is correct
9 Correct 1364 ms 2520 KB Output is correct
10 Correct 875 ms 2676 KB Output is correct
11 Correct 815 ms 2416 KB Output is correct
12 Correct 1852 ms 2584 KB Output is correct
13 Correct 887 ms 2520 KB Output is correct

Subtask #4
47.0 / 47.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 3 ms 376 KB Output is correct
5 Correct 3 ms 376 KB Output is correct
6 Correct 3 ms 376 KB Output is correct
7 Correct 1177 ms 1520 KB Output is correct
8 Correct 1219 ms 1528 KB Output is correct
9 Correct 1364 ms 2520 KB Output is correct
10 Correct 875 ms 2676 KB Output is correct
11 Correct 815 ms 2416 KB Output is correct
12 Correct 1852 ms 2584 KB Output is correct
13 Correct 887 ms 2520 KB Output is correct
14 Correct 1426 ms 1928 KB Output is correct
15 Correct 1778 ms 1812 KB Output is correct
16 Correct 3069 ms 2880 KB Output is correct
17 Correct 3084 ms 3440 KB Output is correct
18 Correct 3173 ms 3312 KB Output is correct
19 Correct 1813 ms 3284 KB Output is correct
20 Correct 3132 ms 3376 KB Output is correct
21 Correct 2925 ms 3440 KB Output is correct
22 Correct 1672 ms 3312 KB Output is correct

Subtask #5
0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 3 ms 376 KB Output is correct
5 Correct 3 ms 376 KB Output is correct
6 Correct 3 ms 376 KB Output is correct
7 Correct 1177 ms 1520 KB Output is correct
8 Correct 1219 ms 1528 KB Output is correct
9 Correct 1364 ms 2520 KB Output is correct
10 Correct 875 ms 2676 KB Output is correct
11 Correct 815 ms 2416 KB Output is correct
12 Correct 1852 ms 2584 KB Output is correct
13 Correct 887 ms 2520 KB Output is correct
14 Correct 1426 ms 1928 KB Output is correct
15 Correct 1778 ms 1812 KB Output is correct
16 Correct 3069 ms 2880 KB Output is correct
17 Correct 3084 ms 3440 KB Output is correct
18 Correct 3173 ms 3312 KB Output is correct
19 Correct 1813 ms 3284 KB Output is correct
20 Correct 3132 ms 3376 KB Output is correct
21 Correct 2925 ms 3440 KB Output is correct
22 Correct 1672 ms 3312 KB Output is correct
23 Correct 6748 ms 6764 KB Output is correct
24 Correct 7156 ms 6632 KB Output is correct
25 Correct 6186 ms 6736 KB Output is correct
26 Correct 5792 ms 6636 KB Output is correct
27 Correct 6432 ms 6632 KB Output is correct
28 Correct 5255 ms 2424 KB Output is correct
29 Correct 5145 ms 2336 KB Output is correct
30 Correct 5219 ms 2396 KB Output is correct
31 Correct 5141 ms 2348 KB Output is correct
32 Correct 5041 ms 6756 KB Output is correct
33 Correct 4072 ms 6772 KB Output is correct
34 Correct 5610 ms 6612 KB Output is correct
35 Correct 4602 ms 7848 KB Output is correct
36 Correct 4534 ms 6792 KB Output is correct
37 Correct 8303 ms 6776 KB Output is correct
38 Correct 5802 ms 6692 KB Output is correct
39 Correct 6112 ms 6688 KB Output is correct
40 Correct 5817 ms 6760 KB Output is correct
41 Execution timed out 9050 ms 6712 KB Time limit exceeded
42 Halted 0 ms 0 KB -