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Submission #1007638

# Submission time Handle Problem Language Result Execution time Memory
1007638 2024-06-25T09:36:11 Z farrellw Wall (IOI14_wall) C++14
100 / 100
 379 ms 48892 KB 
#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define INF 1000000
typedef pair<int, int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;

#include "wall.h"

ii combine(ii upd_new, ii upd_old) {    // apply upd_new to upd_old
    ii res = {max(upd_new.fi, upd_old.fi), min(upd_new.se, upd_old.se)};
    if (res.fi > res.se) { // The ranges are disjoint, so suffices to check either
        res = (upd_old.se < upd_new.se) ? make_pair(upd_new.fi, upd_new.fi) : make_pair(upd_new.se, upd_new.se);
    }
    return res;
}

struct Segtree {    // Segtree of updates
    int sz;
    vector<ii> upd;    // store (a, b)
    Segtree(int N) {
        sz = 1;
        while (sz < N)
            sz *= 2;
        upd = vii(2 * sz, {0, INF});
    }
    void push(int id, int left, int right) { // O(1), for regular updates
        if (right - left == 1)
            return;
        upd[(id<<1)|1] = combine(upd[id], upd[(id<<1)|1]);
        upd[(id<<1) + 2] = combine(upd[id], upd[(id<<1) + 2]);
        upd[id] = {0, INF};
    }

    void push_recursive(int id, int left, int right) { // O(N), only for answer extraction at the end
        if(right - left == 1)
            return;
        push(id, left, right);
        int mid = (left + right)>>1;
        push_recursive((id<<1)|1, left, mid);
        push_recursive(2 * id + 2, mid, right);
    }

    void range_upd(int qleft, int qright, ii val, int id, int left, int right) {
        if (qleft <= left && right <= qright) {
            upd[id] = combine(val, upd[id]);
            return;
        }
        if (qright <= left || right <= qleft)
            return;
        push(id, left, right);
        int mid = (left + right)>>1;
        range_upd(qleft, qright, val, (id<<1)|1, left, mid);
        range_upd(qleft, qright, val, 2 * id + 2, mid, right);
    }
    void range_upd(int qleft, int qright, ii val) {
        range_upd(qleft, qright, val, 0, 0, sz);
    }
};

void buildWall(int n, int k, int op[], int left[], int right[], int height[], int finalHeight[]) {
    Segtree tree(n);
    for(int z = 0; z < k; z++) {
        ii upd_val = (op[z] == 1) ? make_pair(height[z], INF) : make_pair(0, height[z]);
        tree.range_upd(left[z], right[z]+1, upd_val);
    }
    tree.push_recursive(0, 0, tree.sz);
    for(int z = 0; z < n; z++) {
        finalHeight[z] = tree.upd[z+tree.sz-1].fi;
    }
    return;
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 4 ms 604 KB Output is correct
5 Correct 3 ms 604 KB Output is correct
6 Correct 3 ms 604 KB Output is correct

Subtask #2
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 77 ms 8188 KB Output is correct
3 Correct 113 ms 4176 KB Output is correct
4 Correct 327 ms 10644 KB Output is correct
5 Correct 152 ms 10576 KB Output is correct
6 Correct 156 ms 10576 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 4 ms 604 KB Output is correct
5 Correct 2 ms 604 KB Output is correct
6 Correct 2 ms 604 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 66 ms 8224 KB Output is correct
9 Correct 90 ms 4176 KB Output is correct
10 Correct 332 ms 10580 KB Output is correct
11 Correct 157 ms 10576 KB Output is correct
12 Correct 166 ms 10576 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 81 ms 8032 KB Output is correct
15 Correct 21 ms 1372 KB Output is correct
16 Correct 350 ms 10496 KB Output is correct
17 Correct 186 ms 10576 KB Output is correct
18 Correct 175 ms 10576 KB Output is correct

Subtask #4
39.0 / 39.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 4 ms 604 KB Output is correct
5 Correct 3 ms 604 KB Output is correct
6 Correct 3 ms 604 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 101 ms 8256 KB Output is correct
9 Correct 107 ms 4256 KB Output is correct
10 Correct 325 ms 10576 KB Output is correct
11 Correct 164 ms 10580 KB Output is correct
12 Correct 166 ms 10676 KB Output is correct
13 Correct 0 ms 344 KB Output is correct
14 Correct 80 ms 8104 KB Output is correct
15 Correct 21 ms 1372 KB Output is correct
16 Correct 371 ms 10632 KB Output is correct
17 Correct 169 ms 10624 KB Output is correct
18 Correct 169 ms 10576 KB Output is correct
19 Correct 372 ms 48780 KB Output is correct
20 Correct 359 ms 48728 KB Output is correct
21 Correct 355 ms 48776 KB Output is correct
22 Correct 365 ms 48788 KB Output is correct
23 Correct 368 ms 48840 KB Output is correct
24 Correct 346 ms 48724 KB Output is correct
25 Correct 365 ms 48724 KB Output is correct
26 Correct 354 ms 48728 KB Output is correct
27 Correct 379 ms 48828 KB Output is correct
28 Correct 350 ms 48892 KB Output is correct
29 Correct 352 ms 48720 KB Output is correct
30 Correct 342 ms 48720 KB Output is correct