oj.uz

Submission #797735

# Submission time Handle Problem Language Result Execution time Memory
797735 2023-07-29T20:19:03 Z Blagoj Dancing Elephants (IOI11_elephants) C++17
26 / 100
 9000 ms 2132 KB 
#include <bits/stdc++.h>
#include "elephants.h"

using namespace std;

int n, L;
const int K = 400;

int block[K][2 * K], nxt[K][2 * K], val[K][2 * K], sz[K], b[150005], a[150005];
pair<int, int> go[K][2 * K];


void make(int k) {
    int r = 0;
    for (int i = 0; i < sz[k]; i++) {
        while (r < sz[k] && block[k][r] - block[k][i] <= L) r++;
        nxt[k][i] = r;
        val[k][i] = block[k][i] + L;
    }
    for (int i = sz[k] - 1; i >= 0; i--) {
        if (nxt[k][i] == sz[k]) go[k][i] = {1, val[k][i]};
        else go[k][i] = {1 + go[k][nxt[k][i]].first, go[k][nxt[k][i]].second};
    }
}

void build() {
    n = 0;
    for (int i = 0; i < K; i++) 
        for (int j = 0; j < sz[i]; j++) b[n++] = block[i][j];
    for (int i = 0; i < n; i += K) {
        int r = min(n, i + K);
        sz[i / K] = r - i;
        for (int j = 0; j < r; j++) block[i][j] = b[i + j];
        make(i / K);
    }
}

void init(int N, int _L, int X[]) { 
    n = N, L = _L;
    for (int i = 0; i < n; i++) b[i] = a[i] = X[i];
    for (int i = 0; i < n; i += K) {
        int r = min(n, i + K);
        sz[i / K] = r - i;
        for (int j = 0; j < r; j++) block[i / K][j] = b[i + j];
    }
    build();
}

void erase(int i, int x) {
    for (int j = 0; j < sz[i]; j++) {
        if (block[i][j] < x) continue;
        swap(block[i][j], block[i][j + 1]);
    }
    sz[i]--;
    make(i);
}

void del(int x) {
    for (int i = 0; i < K; i++) {
        if (block[i][sz[i] - 1] < x) continue;
        erase(i, x);
        break;
    }
}

void add(int i, int x) {
    int dummy = x;
    for (int j = 0; j < sz[i]; j++) {
        if (block[i][j] < x) continue;
        swap(block[i][j], dummy);
    }
    block[i][sz[i]++] = dummy;
    make(i);
}

void Update(int x) {
    for (int i = 0; i < K; i++) {
        if (x <= block[i][sz[i] - 1]) {
            add(i, x);
            break;
        }
        if (i == (n - 1) / K) {
            add(i, x);
            break;
        }
    }
}

int q = 0;

int update(int x, int y) { 
    del(a[x]);
    a[x] = y;
    Update(a[x]);
    q++;
    if (q == K) {
        build();
        q = 0;
    }
    int ans = 0, pos = block[0][0], i = 0, j = 0;
    while (sz[i]) {
        ans += go[i][j].first;
        pos = go[i][j].second;
        for (i; sz[i] && block[i][sz[i] - 1] <= pos; i++) {}
        int l = 0, r = sz[i - 1] + 1;
        while (l + 1 < r) {
            int m = (l + r) / 2;
            if (block[i][m] <= pos) l = m;
            else r = m; 
        }
        j = l;
    }
    return ans;
}

Compilation message

elephants.cpp: In function 'int update(int, int)':
elephants.cpp:104:14: warning: statement has no effect [-Wunused-value]
  104 |         for (i; sz[i] && block[i][sz[i] - 1] <= pos; i++) {}
      |              ^

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 304 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 304 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct

Subtask #3
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 304 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Execution timed out 9045 ms 2132 KB Time limit exceeded
8 Halted 0 ms 0 KB -

Subtask #4
0 / 47.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 304 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Execution timed out 9045 ms 2132 KB Time limit exceeded
8 Halted 0 ms 0 KB -

Subtask #5
0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 304 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Execution timed out 9045 ms 2132 KB Time limit exceeded
8 Halted 0 ms 0 KB -