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Submission #936695

# Submission time Handle Problem Language Result Execution time Memory
936695 2024-03-02T14:30:47 Z velislavgarkov Building 4 (JOI20_building4) C++14
100 / 100
 206 ms 49236 KB 
#include <iostream>
using namespace std;
const int MAXN=1e6+10;
const int INF=1e9+10;
int a[MAXN], b[MAXN], arr[MAXN];
int dpa[MAXN][2], dpb[MAXN][2];
char ans[MAXN];
int main () {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n;
    cin >> n;
    for (int i=0;i<2*n;i++) cin >> a[i];
    for (int i=0;i<2*n;i++) cin >> b[i];
    dpa[0][0]=1;
    dpb[0][1]=1;
    for (int i=1;i<2*n;i++) {
        dpa[i][0]=dpb[i][0]=-INF;
        dpa[i][1]=dpb[i][1]=-INF;
        if (a[i]>=a[i-1]) {
            dpa[i][0]=max(dpa[i][0],dpa[i-1][0]+1);
            dpb[i][0]=max(dpb[i][0],dpb[i-1][0]);
        }
        if (a[i]>=b[i-1]) {
            dpa[i][0]=max(dpa[i][0],dpa[i-1][1]+1);
            dpb[i][0]=max(dpb[i][0],dpb[i-1][1]);
        }
        if (b[i]>=a[i-1]) {
            dpa[i][1]=max(dpa[i][1],dpa[i-1][0]);
            dpb[i][1]=max(dpb[i][1],dpb[i-1][0]+1);
        }
        if (b[i]>=b[i-1]) {
            dpa[i][1]=max(dpa[i][1],dpa[i-1][1]);
            dpb[i][1]=max(dpb[i][1],dpb[i-1][1]+1);
        }
    }
    if (max(dpa[2*n-1][0],dpa[2*n-1][1])<n || max(dpb[2*n-1][0],dpb[2*n-1][1])<n) {
        cout << -1 << endl;
        return 0;
    }
    int cnta, cntb;
    cnta=cntb=n;
    arr[2*n]=INF;
    for (int i=2*n-1;i>=0;i--) {
        if (cnta>0 && a[i]<=arr[i+1] && dpa[i][0]>=cnta && dpb[i][0]>=cntb) {
            cnta--;
            arr[i]=a[i];
            ans[i]='A';
            continue;
        }
        if (cntb>0 && b[i]<=arr[i+1] && dpa[i][1]>=cnta && dpb[i][1]>=cntb) {
            cntb--;
            arr[i]=b[i];
            ans[i]='B';
            continue;
        }
        cout << -1 << endl;
        return 0;
    }
    for (int i=0;i<2*n;i++) cout << ans[i];
    cout << endl;
    return 0;
}

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 10840 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 1 ms 10588 KB Output is correct
4 Correct 1 ms 10588 KB Output is correct
5 Correct 3 ms 8540 KB Output is correct
6 Correct 2 ms 10584 KB Output is correct
7 Correct 2 ms 10588 KB Output is correct
8 Correct 2 ms 10720 KB Output is correct
9 Correct 2 ms 10588 KB Output is correct
10 Correct 3 ms 10584 KB Output is correct
11 Correct 2 ms 10588 KB Output is correct
12 Correct 3 ms 10588 KB Output is correct
13 Correct 2 ms 10588 KB Output is correct
14 Correct 3 ms 10588 KB Output is correct
15 Correct 2 ms 10588 KB Output is correct
16 Correct 2 ms 8540 KB Output is correct
17 Correct 2 ms 10584 KB Output is correct
18 Correct 2 ms 10588 KB Output is correct
19 Correct 2 ms 10588 KB Output is correct
20 Correct 2 ms 10588 KB Output is correct
21 Correct 2 ms 10584 KB Output is correct
22 Correct 2 ms 10588 KB Output is correct
23 Correct 2 ms 10584 KB Output is correct
24 Correct 2 ms 10588 KB Output is correct
25 Correct 2 ms 10584 KB Output is correct
26 Correct 2 ms 10588 KB Output is correct
27 Correct 2 ms 10588 KB Output is correct
28 Correct 3 ms 10588 KB Output is correct
29 Correct 2 ms 10588 KB Output is correct
30 Correct 2 ms 10588 KB Output is correct
31 Correct 2 ms 10588 KB Output is correct
32 Correct 3 ms 10852 KB Output is correct
33 Correct 3 ms 10584 KB Output is correct

Subtask #2
89.0 / 89.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 10840 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 1 ms 10588 KB Output is correct
4 Correct 1 ms 10588 KB Output is correct
5 Correct 3 ms 8540 KB Output is correct
6 Correct 2 ms 10584 KB Output is correct
7 Correct 2 ms 10588 KB Output is correct
8 Correct 2 ms 10720 KB Output is correct
9 Correct 2 ms 10588 KB Output is correct
10 Correct 3 ms 10584 KB Output is correct
11 Correct 2 ms 10588 KB Output is correct
12 Correct 3 ms 10588 KB Output is correct
13 Correct 2 ms 10588 KB Output is correct
14 Correct 3 ms 10588 KB Output is correct
15 Correct 2 ms 10588 KB Output is correct
16 Correct 2 ms 8540 KB Output is correct
17 Correct 2 ms 10584 KB Output is correct
18 Correct 2 ms 10588 KB Output is correct
19 Correct 2 ms 10588 KB Output is correct
20 Correct 2 ms 10588 KB Output is correct
21 Correct 2 ms 10584 KB Output is correct
22 Correct 2 ms 10588 KB Output is correct
23 Correct 2 ms 10584 KB Output is correct
24 Correct 2 ms 10588 KB Output is correct
25 Correct 2 ms 10584 KB Output is correct
26 Correct 2 ms 10588 KB Output is correct
27 Correct 2 ms 10588 KB Output is correct
28 Correct 3 ms 10588 KB Output is correct
29 Correct 2 ms 10588 KB Output is correct
30 Correct 2 ms 10588 KB Output is correct
31 Correct 2 ms 10588 KB Output is correct
32 Correct 3 ms 10852 KB Output is correct
33 Correct 3 ms 10584 KB Output is correct
34 Correct 163 ms 45520 KB Output is correct
35 Correct 181 ms 47272 KB Output is correct
36 Correct 206 ms 46912 KB Output is correct
37 Correct 178 ms 47444 KB Output is correct
38 Correct 165 ms 47384 KB Output is correct
39 Correct 162 ms 46420 KB Output is correct
40 Correct 186 ms 48564 KB Output is correct
41 Correct 164 ms 47024 KB Output is correct
42 Correct 185 ms 48052 KB Output is correct
43 Correct 187 ms 48948 KB Output is correct
44 Correct 200 ms 49080 KB Output is correct
45 Correct 192 ms 49096 KB Output is correct
46 Correct 182 ms 48976 KB Output is correct
47 Correct 180 ms 48208 KB Output is correct
48 Correct 185 ms 47868 KB Output is correct
49 Correct 176 ms 48724 KB Output is correct
50 Correct 194 ms 48208 KB Output is correct
51 Correct 198 ms 48300 KB Output is correct
52 Correct 130 ms 37204 KB Output is correct
53 Correct 135 ms 37460 KB Output is correct
54 Correct 122 ms 37200 KB Output is correct
55 Correct 122 ms 36944 KB Output is correct
56 Correct 204 ms 49236 KB Output is correct
57 Correct 159 ms 44180 KB Output is correct
58 Correct 166 ms 44112 KB Output is correct
59 Correct 184 ms 44192 KB Output is correct
60 Correct 152 ms 42836 KB Output is correct
61 Correct 162 ms 44832 KB Output is correct
62 Correct 155 ms 44372 KB Output is correct
63 Correct 158 ms 44704 KB Output is correct
64 Correct 165 ms 44112 KB Output is correct
65 Correct 185 ms 44620 KB Output is correct