oj.uz

Submission #797756

# Submission time Handle Problem Language Result Execution time Memory
797756 2023-07-29T20:58:14 Z Blagoj Dancing Elephants (IOI11_elephants) C++17
97 / 100
 9000 ms 8336 KB 
#include <bits/stdc++.h>
#include "elephants.h"

#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast,unroll-loops")

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[(int) 2e5+5], a[(int) 2e5+5];
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 / K][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;
        block[i][j] = block[i][j + 1];
    }
    sz[i]--;
    make(i);
}

void del(int x) {
    for (int i = 0; i < K; i++) {
        if (x <= block[i][sz[i] - 1]) {
            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++) { }
        if (!sz[i]) break;
        int l = 0, r = sz[i] - 1;
        while (l < r) {
            int m = (l + r) / 2;
            if (block[i][m] <= pos) l = m + 1;
            else r = m;
        }
        j = r;
    }
    return ans;
}

Compilation message

elephants.cpp: In function 'int update(int, int)':
elephants.cpp:108:14: warning: statement has no effect [-Wunused-value]
  108 |         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 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 303 ms 1620 KB Output is correct
8 Correct 308 ms 1880 KB Output is correct
9 Correct 332 ms 3648 KB Output is correct
10 Correct 330 ms 3664 KB Output is correct
11 Correct 296 ms 3668 KB Output is correct
12 Correct 534 ms 3676 KB Output is correct
13 Correct 303 ms 3672 KB Output is correct

Subtask #4
47.0 / 47.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 303 ms 1620 KB Output is correct
8 Correct 308 ms 1880 KB Output is correct
9 Correct 332 ms 3648 KB Output is correct
10 Correct 330 ms 3664 KB Output is correct
11 Correct 296 ms 3668 KB Output is correct
12 Correct 534 ms 3676 KB Output is correct
13 Correct 303 ms 3672 KB Output is correct
14 Correct 300 ms 2132 KB Output is correct
15 Correct 485 ms 2440 KB Output is correct
16 Correct 855 ms 3892 KB Output is correct
17 Correct 960 ms 5000 KB Output is correct
18 Correct 958 ms 4992 KB Output is correct
19 Correct 521 ms 5000 KB Output is correct
20 Correct 947 ms 5112 KB Output is correct
21 Correct 903 ms 4992 KB Output is correct
22 Correct 557 ms 4988 KB Output is correct

Subtask #5
0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 303 ms 1620 KB Output is correct
8 Correct 308 ms 1880 KB Output is correct
9 Correct 332 ms 3648 KB Output is correct
10 Correct 330 ms 3664 KB Output is correct
11 Correct 296 ms 3668 KB Output is correct
12 Correct 534 ms 3676 KB Output is correct
13 Correct 303 ms 3672 KB Output is correct
14 Correct 300 ms 2132 KB Output is correct
15 Correct 485 ms 2440 KB Output is correct
16 Correct 855 ms 3892 KB Output is correct
17 Correct 960 ms 5000 KB Output is correct
18 Correct 958 ms 4992 KB Output is correct
19 Correct 521 ms 5000 KB Output is correct
20 Correct 947 ms 5112 KB Output is correct
21 Correct 903 ms 4992 KB Output is correct
22 Correct 557 ms 4988 KB Output is correct
23 Execution timed out 9070 ms 8336 KB Time limit exceeded
24 Halted 0 ms 0 KB -