oj.uz

Submission #797754

# Submission time Handle Problem Language Result Execution time Memory
797754 2023-07-29T20:56:24 Z Blagoj Dancing Elephants (IOI11_elephants) C++17
97 / 100
 9000 ms 8356 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[250005], a[250005];
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 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 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 0 ms 340 KB Output is correct
3 Correct 1 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 1 ms 340 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 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 1 ms 340 KB Output is correct
7 Correct 295 ms 2528 KB Output is correct
8 Correct 308 ms 2900 KB Output is correct
9 Correct 336 ms 5220 KB Output is correct
10 Correct 326 ms 5024 KB Output is correct
11 Correct 300 ms 4956 KB Output is correct
12 Correct 531 ms 5100 KB Output is correct
13 Correct 304 ms 4796 KB Output is correct

Subtask #4
47.0 / 47.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 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 1 ms 340 KB Output is correct
7 Correct 295 ms 2528 KB Output is correct
8 Correct 308 ms 2900 KB Output is correct
9 Correct 336 ms 5220 KB Output is correct
10 Correct 326 ms 5024 KB Output is correct
11 Correct 300 ms 4956 KB Output is correct
12 Correct 531 ms 5100 KB Output is correct
13 Correct 304 ms 4796 KB Output is correct
14 Correct 293 ms 3280 KB Output is correct
15 Correct 487 ms 3604 KB Output is correct
16 Correct 868 ms 4796 KB Output is correct
17 Correct 949 ms 5384 KB Output is correct
18 Correct 952 ms 4992 KB Output is correct
19 Correct 541 ms 4988 KB Output is correct
20 Correct 945 ms 5000 KB Output is correct
21 Correct 890 ms 5052 KB Output is correct
22 Correct 556 ms 4992 KB Output is correct

Subtask #5
0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 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 1 ms 340 KB Output is correct
7 Correct 295 ms 2528 KB Output is correct
8 Correct 308 ms 2900 KB Output is correct
9 Correct 336 ms 5220 KB Output is correct
10 Correct 326 ms 5024 KB Output is correct
11 Correct 300 ms 4956 KB Output is correct
12 Correct 531 ms 5100 KB Output is correct
13 Correct 304 ms 4796 KB Output is correct
14 Correct 293 ms 3280 KB Output is correct
15 Correct 487 ms 3604 KB Output is correct
16 Correct 868 ms 4796 KB Output is correct
17 Correct 949 ms 5384 KB Output is correct
18 Correct 952 ms 4992 KB Output is correct
19 Correct 541 ms 4988 KB Output is correct
20 Correct 945 ms 5000 KB Output is correct
21 Correct 890 ms 5052 KB Output is correct
22 Correct 556 ms 4992 KB Output is correct
23 Execution timed out 9018 ms 8356 KB Time limit exceeded
24 Halted 0 ms 0 KB -