oj.uz

Submission #551049

# Submission time Handle Problem Language Result Execution time Memory
551049 2022-04-19T18:13:59 Z LucaDantas Sparklers (JOI17_sparklers) C++17
50 / 100
 50 ms 4416 KB 
#include <bits/stdc++.h>
using namespace std;

constexpr int maxn = 1010, inf = 0x3f3f3f3f;

int x[maxn], n, k, T, v;

int dp[maxn][maxn];

void solve(int l, int r) {
    if(dp[l][r]) return;
    dp[l][r] = 1;
    if(l && (x[r] - x[l-1]) <= 1ll * 2 * v * T * (r-l+1))
        solve(l-1, r);
    if(r < n-1 && (x[r+1] - x[l]) <= 1ll * 2 * v * T * (r-l+1))
        solve(l, r+1);
}

int main() {
    scanf("%d %d %d", &n, &k, &T); --k; // 0-indexed
    for(int i = 0; i < n; i++)
        scanf("%d", x+i);

    int l = 0, r = inf, ans = -1;
    while(l <= r) {
        int m = (l+r) >> 1;
        v = m;
        memset(dp, 0, sizeof dp);
        solve(k, k);
        if(dp[0][n-1])
            r = m-1, ans = m;
        else
            l = m+1;
    }

    printf("%d\n", ans);
}

Compilation message

sparklers.cpp: In function 'int main()':
sparklers.cpp:20:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |     scanf("%d %d %d", &n, &k, &T); --k; // 0-indexed
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:22:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         scanf("%d", x+i);
      |         ~~~~~^~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 4180 KB Output is correct
2 Correct 7 ms 4180 KB Output is correct
3 Correct 5 ms 4280 KB Output is correct
4 Correct 5 ms 4180 KB Output is correct
5 Correct 5 ms 4180 KB Output is correct
6 Correct 5 ms 4272 KB Output is correct
7 Correct 5 ms 4180 KB Output is correct
8 Correct 5 ms 4180 KB Output is correct
9 Correct 5 ms 4276 KB Output is correct
10 Correct 5 ms 4272 KB Output is correct
11 Correct 5 ms 4180 KB Output is correct
12 Correct 5 ms 4180 KB Output is correct
13 Correct 5 ms 4276 KB Output is correct
14 Correct 5 ms 4180 KB Output is correct
15 Correct 5 ms 4296 KB Output is correct
16 Correct 5 ms 4180 KB Output is correct
17 Correct 5 ms 4180 KB Output is correct
18 Correct 5 ms 4272 KB Output is correct
19 Correct 6 ms 4296 KB Output is correct
20 Correct 5 ms 4180 KB Output is correct
21 Correct 5 ms 4268 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 4180 KB Output is correct
2 Correct 7 ms 4180 KB Output is correct
3 Correct 5 ms 4280 KB Output is correct
4 Correct 5 ms 4180 KB Output is correct
5 Correct 5 ms 4180 KB Output is correct
6 Correct 5 ms 4272 KB Output is correct
7 Correct 5 ms 4180 KB Output is correct
8 Correct 5 ms 4180 KB Output is correct
9 Correct 5 ms 4276 KB Output is correct
10 Correct 5 ms 4272 KB Output is correct
11 Correct 5 ms 4180 KB Output is correct
12 Correct 5 ms 4180 KB Output is correct
13 Correct 5 ms 4276 KB Output is correct
14 Correct 5 ms 4180 KB Output is correct
15 Correct 5 ms 4296 KB Output is correct
16 Correct 5 ms 4180 KB Output is correct
17 Correct 5 ms 4180 KB Output is correct
18 Correct 5 ms 4272 KB Output is correct
19 Correct 6 ms 4296 KB Output is correct
20 Correct 5 ms 4180 KB Output is correct
21 Correct 5 ms 4268 KB Output is correct
22 Correct 31 ms 4276 KB Output is correct
23 Correct 17 ms 4308 KB Output is correct
24 Correct 9 ms 4180 KB Output is correct
25 Correct 8 ms 4308 KB Output is correct
26 Correct 24 ms 4416 KB Output is correct
27 Correct 23 ms 4308 KB Output is correct
28 Correct 36 ms 4308 KB Output is correct
29 Correct 36 ms 4328 KB Output is correct
30 Correct 32 ms 4328 KB Output is correct
31 Correct 29 ms 4308 KB Output is correct
32 Correct 34 ms 4308 KB Output is correct
33 Correct 34 ms 4308 KB Output is correct
34 Correct 20 ms 4308 KB Output is correct
35 Correct 40 ms 4308 KB Output is correct
36 Correct 14 ms 4304 KB Output is correct
37 Correct 14 ms 4308 KB Output is correct
38 Correct 31 ms 4308 KB Output is correct
39 Correct 13 ms 4308 KB Output is correct
40 Correct 50 ms 4308 KB Output is correct

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 4180 KB Output is correct
2 Correct 7 ms 4180 KB Output is correct
3 Correct 5 ms 4280 KB Output is correct
4 Correct 5 ms 4180 KB Output is correct
5 Correct 5 ms 4180 KB Output is correct
6 Correct 5 ms 4272 KB Output is correct
7 Correct 5 ms 4180 KB Output is correct
8 Correct 5 ms 4180 KB Output is correct
9 Correct 5 ms 4276 KB Output is correct
10 Correct 5 ms 4272 KB Output is correct
11 Correct 5 ms 4180 KB Output is correct
12 Correct 5 ms 4180 KB Output is correct
13 Correct 5 ms 4276 KB Output is correct
14 Correct 5 ms 4180 KB Output is correct
15 Correct 5 ms 4296 KB Output is correct
16 Correct 5 ms 4180 KB Output is correct
17 Correct 5 ms 4180 KB Output is correct
18 Correct 5 ms 4272 KB Output is correct
19 Correct 6 ms 4296 KB Output is correct
20 Correct 5 ms 4180 KB Output is correct
21 Correct 5 ms 4268 KB Output is correct
22 Correct 31 ms 4276 KB Output is correct
23 Correct 17 ms 4308 KB Output is correct
24 Correct 9 ms 4180 KB Output is correct
25 Correct 8 ms 4308 KB Output is correct
26 Correct 24 ms 4416 KB Output is correct
27 Correct 23 ms 4308 KB Output is correct
28 Correct 36 ms 4308 KB Output is correct
29 Correct 36 ms 4328 KB Output is correct
30 Correct 32 ms 4328 KB Output is correct
31 Correct 29 ms 4308 KB Output is correct
32 Correct 34 ms 4308 KB Output is correct
33 Correct 34 ms 4308 KB Output is correct
34 Correct 20 ms 4308 KB Output is correct
35 Correct 40 ms 4308 KB Output is correct
36 Correct 14 ms 4304 KB Output is correct
37 Correct 14 ms 4308 KB Output is correct
38 Correct 31 ms 4308 KB Output is correct
39 Correct 13 ms 4308 KB Output is correct
40 Correct 50 ms 4308 KB Output is correct
41 Runtime error 2 ms 596 KB Execution killed with signal 11
42 Halted 0 ms 0 KB -