oj.uz

Submission #211541

# Submission time Handle Problem Language Result Execution time Memory
211541 2020-03-20T17:00:04 Z RezwanArefin01 Building 4 (JOI20_building4) C++17
100 / 100
 507 ms 119968 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> ii;

const int N = 1e6 + 5;

int n, a[2][N], dp[2][2][N], idx;
char s[N];

int f(int c, int x, int i) {
  if(i == 2 * n) return c == x;

  int &ret = dp[c][x][i]; 
  if(~ret) return ret; 
  ret = -1e9;

  if (a[x][i] <= a[x][i + 1]) ret = max(ret, f(c, x, i + 1)); 
  if (a[x][i] <= a[x ^ 1][i + 1]) ret = max(ret, f(c, x ^ 1, i + 1)); 
  ret += c == x; 
  return ret; 
}

int main() {
  scanf("%d", &n);

  for (int i = 0; i < 2; ++i) {
    for (int j = 1; j <= 2 * n; ++j) {
      scanf("%d", &a[i][j]);
    }
  }

  memset(dp, -1, sizeof dp);

  int p = 0, X = 0, Y = 0;

  auto extend = [&](int x, int i) {
    s[idx++] = x ? 'B' : 'A';
    p = a[x][i];
    x ? Y++ : X++;
  };

  for (int i = 1; i <= 2 * n; ++i) {
    if (X != n && p <= a[0][i] && X + f(0, 0, i) >= n && Y + f(1, 0, i) >= n) {
      extend(0, i); 
    } else if (Y != n && p <= a[1][i]) {
      extend(1, i); 
    } else {
      break;
    }
  }

  if (idx == 2 * n) {
    s[idx] = '\0';
    printf("%s\n", s);
  } else {
    puts("-1");
  }
}

Compilation message

building4.cpp: In function 'int main()':
building4.cpp:26:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
   ~~~~~^~~~~~~~~~
building4.cpp:30:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d", &a[i][j]);
       ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 16000 KB Output is correct
2 Correct 11 ms 16000 KB Output is correct
3 Correct 12 ms 16000 KB Output is correct
4 Correct 11 ms 16000 KB Output is correct
5 Correct 13 ms 16000 KB Output is correct
6 Correct 13 ms 16384 KB Output is correct
7 Correct 19 ms 16384 KB Output is correct
8 Correct 13 ms 16384 KB Output is correct
9 Correct 15 ms 16360 KB Output is correct
10 Correct 12 ms 16384 KB Output is correct
11 Correct 14 ms 16384 KB Output is correct
12 Correct 14 ms 16384 KB Output is correct
13 Correct 17 ms 16384 KB Output is correct
14 Correct 13 ms 16384 KB Output is correct
15 Correct 13 ms 16384 KB Output is correct
16 Correct 13 ms 16352 KB Output is correct
17 Correct 13 ms 16384 KB Output is correct
18 Correct 14 ms 16408 KB Output is correct
19 Correct 14 ms 16384 KB Output is correct
20 Correct 13 ms 16384 KB Output is correct
21 Correct 15 ms 16416 KB Output is correct
22 Correct 18 ms 16384 KB Output is correct
23 Correct 19 ms 16384 KB Output is correct
24 Correct 13 ms 16384 KB Output is correct
25 Correct 14 ms 16384 KB Output is correct
26 Correct 13 ms 16384 KB Output is correct
27 Correct 15 ms 16384 KB Output is correct
28 Correct 13 ms 16384 KB Output is correct
29 Correct 13 ms 16384 KB Output is correct
30 Correct 13 ms 16384 KB Output is correct
31 Correct 13 ms 16384 KB Output is correct
32 Correct 13 ms 16304 KB Output is correct
33 Correct 14 ms 16384 KB Output is correct

Subtask #2
89.0 / 89.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 16000 KB Output is correct
2 Correct 11 ms 16000 KB Output is correct
3 Correct 12 ms 16000 KB Output is correct
4 Correct 11 ms 16000 KB Output is correct
5 Correct 13 ms 16000 KB Output is correct
6 Correct 13 ms 16384 KB Output is correct
7 Correct 19 ms 16384 KB Output is correct
8 Correct 13 ms 16384 KB Output is correct
9 Correct 15 ms 16360 KB Output is correct
10 Correct 12 ms 16384 KB Output is correct
11 Correct 14 ms 16384 KB Output is correct
12 Correct 14 ms 16384 KB Output is correct
13 Correct 17 ms 16384 KB Output is correct
14 Correct 13 ms 16384 KB Output is correct
15 Correct 13 ms 16384 KB Output is correct
16 Correct 13 ms 16352 KB Output is correct
17 Correct 13 ms 16384 KB Output is correct
18 Correct 14 ms 16408 KB Output is correct
19 Correct 14 ms 16384 KB Output is correct
20 Correct 13 ms 16384 KB Output is correct
21 Correct 15 ms 16416 KB Output is correct
22 Correct 18 ms 16384 KB Output is correct
23 Correct 19 ms 16384 KB Output is correct
24 Correct 13 ms 16384 KB Output is correct
25 Correct 14 ms 16384 KB Output is correct
26 Correct 13 ms 16384 KB Output is correct
27 Correct 15 ms 16384 KB Output is correct
28 Correct 13 ms 16384 KB Output is correct
29 Correct 13 ms 16384 KB Output is correct
30 Correct 13 ms 16384 KB Output is correct
31 Correct 13 ms 16384 KB Output is correct
32 Correct 13 ms 16304 KB Output is correct
33 Correct 14 ms 16384 KB Output is correct
34 Correct 377 ms 23672 KB Output is correct
35 Correct 479 ms 112128 KB Output is correct
36 Correct 490 ms 110688 KB Output is correct
37 Correct 453 ms 112636 KB Output is correct
38 Correct 461 ms 112504 KB Output is correct
39 Correct 462 ms 113144 KB Output is correct
40 Correct 449 ms 119160 KB Output is correct
41 Correct 394 ms 114680 KB Output is correct
42 Correct 472 ms 116472 KB Output is correct
43 Correct 481 ms 119800 KB Output is correct
44 Correct 502 ms 119800 KB Output is correct
45 Correct 484 ms 119672 KB Output is correct
46 Correct 507 ms 119672 KB Output is correct
47 Correct 460 ms 119676 KB Output is correct
48 Correct 443 ms 119800 KB Output is correct
49 Correct 477 ms 119928 KB Output is correct
50 Correct 478 ms 119776 KB Output is correct
51 Correct 477 ms 119704 KB Output is correct
52 Correct 369 ms 119800 KB Output is correct
53 Correct 374 ms 119672 KB Output is correct
54 Correct 377 ms 119672 KB Output is correct
55 Correct 367 ms 119968 KB Output is correct
56 Correct 492 ms 119868 KB Output is correct
57 Correct 399 ms 119288 KB Output is correct
58 Correct 407 ms 119800 KB Output is correct
59 Correct 401 ms 119720 KB Output is correct
60 Correct 373 ms 113404 KB Output is correct
61 Correct 399 ms 119672 KB Output is correct
62 Correct 402 ms 118200 KB Output is correct
63 Correct 393 ms 119800 KB Output is correct
64 Correct 380 ms 116216 KB Output is correct
65 Correct 392 ms 119772 KB Output is correct