oj.uz

Submission #797757

# Submission time Handle Problem Language Result Execution time Memory
797757 2023-07-29T20:58:49 Z Blagoj Dancing Elephants (IOI11_elephants) C++17
97 / 100
 9000 ms 8420 KB 
#include <bits/stdc++.h>
#include "elephants.h"

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

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:107:14: warning: statement has no effect [-Wunused-value]
  107 |         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 1 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 1 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 305 ms 1620 KB Output is correct
8 Correct 318 ms 1880 KB Output is correct
9 Correct 339 ms 3660 KB Output is correct
10 Correct 326 ms 3672 KB Output is correct
11 Correct 295 ms 3672 KB Output is correct
12 Correct 549 ms 3668 KB Output is correct
13 Correct 296 ms 3668 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 1 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 305 ms 1620 KB Output is correct
8 Correct 318 ms 1880 KB Output is correct
9 Correct 339 ms 3660 KB Output is correct
10 Correct 326 ms 3672 KB Output is correct
11 Correct 295 ms 3672 KB Output is correct
12 Correct 549 ms 3668 KB Output is correct
13 Correct 296 ms 3668 KB Output is correct
14 Correct 297 ms 2044 KB Output is correct
15 Correct 490 ms 2448 KB Output is correct
16 Correct 859 ms 3924 KB Output is correct
17 Correct 949 ms 4992 KB Output is correct
18 Correct 977 ms 4992 KB Output is correct
19 Correct 500 ms 4988 KB Output is correct
20 Correct 967 ms 5068 KB Output is correct
21 Correct 888 ms 4996 KB Output is correct
22 Correct 526 ms 4996 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 1 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 305 ms 1620 KB Output is correct
8 Correct 318 ms 1880 KB Output is correct
9 Correct 339 ms 3660 KB Output is correct
10 Correct 326 ms 3672 KB Output is correct
11 Correct 295 ms 3672 KB Output is correct
12 Correct 549 ms 3668 KB Output is correct
13 Correct 296 ms 3668 KB Output is correct
14 Correct 297 ms 2044 KB Output is correct
15 Correct 490 ms 2448 KB Output is correct
16 Correct 859 ms 3924 KB Output is correct
17 Correct 949 ms 4992 KB Output is correct
18 Correct 977 ms 4992 KB Output is correct
19 Correct 500 ms 4988 KB Output is correct
20 Correct 967 ms 5068 KB Output is correct
21 Correct 888 ms 4996 KB Output is correct
22 Correct 526 ms 4996 KB Output is correct
23 Execution timed out 9053 ms 8420 KB Time limit exceeded
24 Halted 0 ms 0 KB -