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Submission #1087073

# Submission time Handle Problem Language Result Execution time Memory
1087073 2024-09-12T07:28:48 Z pokmui9909 Sparklers (JOI17_sparklers) C++17
100 / 100
 28 ms 3052 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

ll N, K, T, A[100005], B[100005];

bool f(ll v){
    for(ll i = 1; i <= N; i++){
        B[i] = A[i] - 2 * v * T * i;
    }
    ll gl = K, gr = K;
    for(ll i = 1; i <= N; i++){
        if(i <= K && B[gl] <= B[i]) gl = i;
        if(i >= K && B[gr] >= B[i]) gr = i;
    }
    ll l = K, r = K;
    while(1){
        ll ch = 0, nl = l, nr = r;
        while(nl > gl && B[nl - 1] >= B[r] && (nl == l || B[nl] < B[l])) nl--;
        if(B[nl] >= B[l] && nl < l){
            l = nl, ch = 1;
        }

        while(nr < gr && B[nr + 1] <= B[l] && (nr == r || B[nr] > B[r])) nr++;
        if(B[nr] <= B[r] && nr > r){
            r = nr, ch = 1;
        }
        if(ch == 0) break;
    }
    if(l != gl || r != gr) return 0;
    l = 1, r = N;
    if(B[l] < B[r]) return 0;
    while(1){
        ll ch = 0, nl = l, nr = r;
        while(nl < gl && B[nl + 1] >= B[r] && (nl == l || B[nl] < B[l])) nl++;
        if(B[nl] >= B[l] && nl > l){
            l = nl, ch = 1;
        }

        while(nr > gr && B[nr - 1] <= B[l] && (nr == r || B[nr] > B[r])) nr--;
        if(B[nr] <= B[r] && nr < r){
            r = nr, ch = 1;
        }
        if(ch == 0) break;
    }
    return (l == gl && r == gr);
}

int main(){
    cin.tie(0) -> sync_with_stdio(0);

    cin >> N >> K >> T;
    for(ll i = 1; i <= N; i++){
        cin >> A[i];
    }
    if(A[N] == 0){
        cout << 0; return 0;
    }
    ll L = 1, R = 1e9;
    while(L <= R){
        ll m = (L + R) / 2;
        if(f(m)) R = m - 1;
        else L = m + 1;
    }
    cout << L;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 464 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 464 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 1 ms 600 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 1 ms 344 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 0 ms 348 KB Output is correct
35 Correct 0 ms 348 KB Output is correct
36 Correct 0 ms 348 KB Output is correct
37 Correct 1 ms 480 KB Output is correct
38 Correct 0 ms 348 KB Output is correct
39 Correct 1 ms 348 KB Output is correct
40 Correct 0 ms 344 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 464 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 1 ms 600 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 1 ms 344 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 0 ms 348 KB Output is correct
35 Correct 0 ms 348 KB Output is correct
36 Correct 0 ms 348 KB Output is correct
37 Correct 1 ms 480 KB Output is correct
38 Correct 0 ms 348 KB Output is correct
39 Correct 1 ms 348 KB Output is correct
40 Correct 0 ms 344 KB Output is correct
41 Correct 20 ms 2140 KB Output is correct
42 Correct 1 ms 480 KB Output is correct
43 Correct 5 ms 744 KB Output is correct
44 Correct 27 ms 2912 KB Output is correct
45 Correct 22 ms 2912 KB Output is correct
46 Correct 22 ms 2908 KB Output is correct
47 Correct 25 ms 2912 KB Output is correct
48 Correct 23 ms 2908 KB Output is correct
49 Correct 23 ms 2908 KB Output is correct
50 Correct 22 ms 2900 KB Output is correct
51 Correct 25 ms 2908 KB Output is correct
52 Correct 22 ms 2908 KB Output is correct
53 Correct 24 ms 2940 KB Output is correct
54 Correct 28 ms 2932 KB Output is correct
55 Correct 24 ms 2904 KB Output is correct
56 Correct 23 ms 2908 KB Output is correct
57 Correct 22 ms 2908 KB Output is correct
58 Correct 23 ms 2908 KB Output is correct
59 Correct 4 ms 1368 KB Output is correct
60 Correct 21 ms 2980 KB Output is correct
61 Correct 21 ms 2908 KB Output is correct
62 Correct 22 ms 2908 KB Output is correct
63 Correct 21 ms 2904 KB Output is correct
64 Correct 24 ms 3052 KB Output is correct
65 Correct 22 ms 2904 KB Output is correct
66 Correct 22 ms 2908 KB Output is correct
67 Correct 21 ms 2904 KB Output is correct
68 Correct 21 ms 2908 KB Output is correct
69 Correct 26 ms 2732 KB Output is correct