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Submission #1007661

# Submission time Handle Problem Language Result Execution time Memory
1007661 2024-06-25T09:54:29 Z farrellw Wall (IOI14_wall) C++14
100 / 100
 432 ms 98156 KB 
#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define INF 100005
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
        return (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)
    vi left;
    vi right;
    vi mid;
    Segtree(int N) {
        sz = 1;
        while (sz < N)
            sz *= 2;
        upd = vii(2 * sz, {0, INF});
        left = vi(2 * sz, 0);
        right = vi(2 * sz, 0);
        mid = vi(2 * sz, 0);
        for(int id = sz-1; id < 2*sz-1; id++) {
            left[id] = id-sz+1;
            right[id] = id-sz+2;
        }
        for(int id = sz-2; id >= 0; id--) {
            left[id] = left[(id<<1)|1];
            right[id] = right[2 * id + 2];
            mid[id] = (left[id] + right[id])>>1;
        }
    }
    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[2 * id + 2] = combine(upd[id], upd[2 * id + 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 0 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 1116 KB Output is correct
5 Correct 3 ms 1116 KB Output is correct
6 Correct 3 ms 1112 KB Output is correct

Subtask #2
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 79 ms 8192 KB Output is correct
3 Correct 101 ms 4948 KB Output is correct
4 Correct 341 ms 13652 KB Output is correct
5 Correct 181 ms 13768 KB Output is correct
6 Correct 163 ms 13648 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 0 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 1116 KB Output is correct
5 Correct 3 ms 1116 KB Output is correct
6 Correct 3 ms 1224 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 77 ms 8032 KB Output is correct
9 Correct 99 ms 4868 KB Output is correct
10 Correct 345 ms 13652 KB Output is correct
11 Correct 164 ms 13644 KB Output is correct
12 Correct 163 ms 13652 KB Output is correct
13 Correct 0 ms 344 KB Output is correct
14 Correct 76 ms 8112 KB Output is correct
15 Correct 22 ms 2140 KB Output is correct
16 Correct 378 ms 13648 KB Output is correct
17 Correct 170 ms 13604 KB Output is correct
18 Correct 168 ms 13636 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 6 ms 1056 KB Output is correct
5 Correct 3 ms 1116 KB Output is correct
6 Correct 3 ms 1116 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 77 ms 8088 KB Output is correct
9 Correct 106 ms 4948 KB Output is correct
10 Correct 320 ms 13776 KB Output is correct
11 Correct 160 ms 13636 KB Output is correct
12 Correct 167 ms 13576 KB Output is correct
13 Correct 0 ms 344 KB Output is correct
14 Correct 80 ms 8256 KB Output is correct
15 Correct 35 ms 2140 KB Output is correct
16 Correct 406 ms 13652 KB Output is correct
17 Correct 178 ms 13648 KB Output is correct
18 Correct 191 ms 13540 KB Output is correct
19 Correct 400 ms 97976 KB Output is correct
20 Correct 410 ms 98140 KB Output is correct
21 Correct 403 ms 98128 KB Output is correct
22 Correct 379 ms 98044 KB Output is correct
23 Correct 423 ms 98128 KB Output is correct
24 Correct 394 ms 98124 KB Output is correct
25 Correct 397 ms 98132 KB Output is correct
26 Correct 432 ms 98132 KB Output is correct
27 Correct 394 ms 98132 KB Output is correct
28 Correct 422 ms 97944 KB Output is correct
29 Correct 392 ms 98156 KB Output is correct
30 Correct 410 ms 98092 KB Output is correct