oj.uz

Submission #131480

# Submission time Handle Problem Language Result Execution time Memory
131480 2019-07-17T07:56:39 Z 송준혁(#3182) Sparklers (JOI17_sparklers) C++14
50 / 100
 313 ms 32408 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long LL;
typedef pair<LL, int> pii;

int N, K;
LL A[2020], P, ans;
LL D[2020][2020];

bool chk(LL k){
    memset(D, -1, sizeof D);
    D[K][K] = P*2*k;
    for (int i=1; i<N; i++){
        for (int j=1; j+i-1<=N; j++){
            if (D[j][j+i-1] < 0) continue;
            if (j > 1 && A[j] - A[j-1] <= D[j][j+i-1]) D[j-1][j+i-1] = D[j][j+i-1] - (A[j] - A[j-1]) + P*2*k;
            if (j < N && A[j+i] - A[j+i-1] <= D[j][j+i-1]) D[j][j+i] = D[j][j+i-1] - (A[j+i] - A[j+i-1]) + P*2*k;
        }
    }
    if (D[1][N] >= 0) return true;
    return false;
}

int main(){
    scanf("%d %d %lld", &N, &K, &P);
    for (int i=1; i<=N; i++) scanf("%lld", &A[i]);
    if (A[1] == A[N]){
        puts("0");
        return 0;
    }
    LL L = 1, R = 1000000000;
    while (L <= R){
        LL mid = (L+R)/2;
        if (chk(mid)) R = mid-1, ans = mid;
        else L = mid+1;
    }
    printf("%lld\n", ans);
    return 0;
}

Compilation message

sparklers.cpp: In function 'int main()':
sparklers.cpp:25:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %lld", &N, &K, &P);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:26:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for (int i=1; i<=N; i++) scanf("%lld", &A[i]);
                              ~~~~~^~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 164 ms 32304 KB Output is correct
2 Correct 260 ms 32376 KB Output is correct
3 Correct 189 ms 32308 KB Output is correct
4 Correct 223 ms 32300 KB Output is correct
5 Correct 186 ms 32308 KB Output is correct
6 Correct 197 ms 32300 KB Output is correct
7 Correct 184 ms 32308 KB Output is correct
8 Correct 186 ms 32376 KB Output is correct
9 Correct 185 ms 32248 KB Output is correct
10 Correct 188 ms 32248 KB Output is correct
11 Correct 241 ms 32308 KB Output is correct
12 Correct 187 ms 32348 KB Output is correct
13 Correct 208 ms 32376 KB Output is correct
14 Correct 183 ms 32188 KB Output is correct
15 Correct 184 ms 32376 KB Output is correct
16 Correct 183 ms 32376 KB Output is correct
17 Correct 281 ms 32248 KB Output is correct
18 Correct 267 ms 32248 KB Output is correct
19 Correct 2 ms 376 KB Output is correct
20 Correct 197 ms 32248 KB Output is correct
21 Correct 2 ms 256 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 164 ms 32304 KB Output is correct
2 Correct 260 ms 32376 KB Output is correct
3 Correct 189 ms 32308 KB Output is correct
4 Correct 223 ms 32300 KB Output is correct
5 Correct 186 ms 32308 KB Output is correct
6 Correct 197 ms 32300 KB Output is correct
7 Correct 184 ms 32308 KB Output is correct
8 Correct 186 ms 32376 KB Output is correct
9 Correct 185 ms 32248 KB Output is correct
10 Correct 188 ms 32248 KB Output is correct
11 Correct 241 ms 32308 KB Output is correct
12 Correct 187 ms 32348 KB Output is correct
13 Correct 208 ms 32376 KB Output is correct
14 Correct 183 ms 32188 KB Output is correct
15 Correct 184 ms 32376 KB Output is correct
16 Correct 183 ms 32376 KB Output is correct
17 Correct 281 ms 32248 KB Output is correct
18 Correct 267 ms 32248 KB Output is correct
19 Correct 2 ms 376 KB Output is correct
20 Correct 197 ms 32248 KB Output is correct
21 Correct 2 ms 256 KB Output is correct
22 Correct 291 ms 32316 KB Output is correct
23 Correct 217 ms 32248 KB Output is correct
24 Correct 229 ms 32312 KB Output is correct
25 Correct 257 ms 32376 KB Output is correct
26 Correct 280 ms 32348 KB Output is correct
27 Correct 299 ms 32408 KB Output is correct
28 Correct 313 ms 32376 KB Output is correct
29 Correct 302 ms 32320 KB Output is correct
30 Correct 286 ms 32388 KB Output is correct
31 Correct 290 ms 32376 KB Output is correct
32 Correct 301 ms 32380 KB Output is correct
33 Correct 308 ms 32356 KB Output is correct
34 Correct 261 ms 32248 KB Output is correct
35 Correct 292 ms 32376 KB Output is correct
36 Correct 266 ms 32248 KB Output is correct
37 Correct 253 ms 32248 KB Output is correct
38 Correct 298 ms 32396 KB Output is correct
39 Correct 290 ms 32356 KB Output is correct
40 Correct 2 ms 376 KB Output is correct

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 164 ms 32304 KB Output is correct
2 Correct 260 ms 32376 KB Output is correct
3 Correct 189 ms 32308 KB Output is correct
4 Correct 223 ms 32300 KB Output is correct
5 Correct 186 ms 32308 KB Output is correct
6 Correct 197 ms 32300 KB Output is correct
7 Correct 184 ms 32308 KB Output is correct
8 Correct 186 ms 32376 KB Output is correct
9 Correct 185 ms 32248 KB Output is correct
10 Correct 188 ms 32248 KB Output is correct
11 Correct 241 ms 32308 KB Output is correct
12 Correct 187 ms 32348 KB Output is correct
13 Correct 208 ms 32376 KB Output is correct
14 Correct 183 ms 32188 KB Output is correct
15 Correct 184 ms 32376 KB Output is correct
16 Correct 183 ms 32376 KB Output is correct
17 Correct 281 ms 32248 KB Output is correct
18 Correct 267 ms 32248 KB Output is correct
19 Correct 2 ms 376 KB Output is correct
20 Correct 197 ms 32248 KB Output is correct
21 Correct 2 ms 256 KB Output is correct
22 Correct 291 ms 32316 KB Output is correct
23 Correct 217 ms 32248 KB Output is correct
24 Correct 229 ms 32312 KB Output is correct
25 Correct 257 ms 32376 KB Output is correct
26 Correct 280 ms 32348 KB Output is correct
27 Correct 299 ms 32408 KB Output is correct
28 Correct 313 ms 32376 KB Output is correct
29 Correct 302 ms 32320 KB Output is correct
30 Correct 286 ms 32388 KB Output is correct
31 Correct 290 ms 32376 KB Output is correct
32 Correct 301 ms 32380 KB Output is correct
33 Correct 308 ms 32356 KB Output is correct
34 Correct 261 ms 32248 KB Output is correct
35 Correct 292 ms 32376 KB Output is correct
36 Correct 266 ms 32248 KB Output is correct
37 Correct 253 ms 32248 KB Output is correct
38 Correct 298 ms 32396 KB Output is correct
39 Correct 290 ms 32356 KB Output is correct
40 Correct 2 ms 376 KB Output is correct
41 Incorrect 3 ms 504 KB Output isn't correct
42 Halted 0 ms 0 KB -