oj.uz

Submission #480717

# Submission time Handle Problem Language Result Execution time Memory
480717 2021-10-18T00:49:46 Z Mackerel_Pike The Kingdom of JOIOI (JOI17_joioi) C++14
100 / 100
 628 ms 54936 KB 
#include <bits/stdc++.h>

using namespace std;

const int maxn = 2005;

int n, m, mn, mx;
int a[maxn][maxn];
int l[maxn], r[maxn];

inline bool solve(int md){
  for(int i = 0; i < n; ++i){
    for(r[i] = -1; r[i] + 1 < m && a[i][r[i] + 1] >= mx - md; ++r[i]);
    for(l[i] = m; l[i] - 1 >= 0 && a[i][l[i] - 1] <= mn + md; --l[i]);
    --l[i];
    if(l[i] > r[i])
      return false;
  }
  int lst = -1; bool ok = true;
  for(int i = 0; i < n; ++i){
    lst = max(lst, l[i]);
    ok &= (lst <= r[i]);
  }
  if(ok)
    return true;
  lst = m;
  for(int i = 0; i < n; ++i){
    lst = min(lst, r[i]);
    if(lst < l[i])
      return false;
  }
  return true;
}

inline bool check(int md){
  if(solve(md))
    return true;
  for(int i = 0; i < n; ++i)
    reverse(a[i], a[i] + m);
  return solve(md);
}

int main(){
  //freopen("joioi.in", "r", stdin);
  
  scanf("%d%d", &n, &m);
  mx = 0, mn = 0x3f3f3f3f;
  
  for(int i = 0; i < n; ++i)
    for(int j = 0; j < m; ++j)
      scanf("%d", &a[i][j]), mx = max(mx, a[i][j]), mn = min(mn, a[i][j]);

  int lb = -1, rb = 1e9;
  for(; lb + 1 < rb; ){
    int md = lb + rb >> 1;
    if(check(md))
      rb = md;
    else
      lb = md;
  }

  printf("%d\n", rb);
  return 0;
}

Compilation message

joioi.cpp: In function 'int main()':
joioi.cpp:55:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   55 |     int md = lb + rb >> 1;
      |              ~~~^~~~
joioi.cpp:46:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |   scanf("%d%d", &n, &m);
      |   ~~~~~^~~~~~~~~~~~~~~~
joioi.cpp:51:12: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |       scanf("%d", &a[i][j]), mx = max(mx, a[i][j]), mn = min(mn, a[i][j]);
      |       ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 300 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 304 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 296 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 0 ms 332 KB Output is correct
12 Correct 0 ms 332 KB Output is correct
13 Correct 0 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 300 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 304 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 296 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 0 ms 332 KB Output is correct
12 Correct 0 ms 332 KB Output is correct
13 Correct 0 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 6 ms 1228 KB Output is correct
17 Correct 7 ms 1484 KB Output is correct
18 Correct 7 ms 1484 KB Output is correct
19 Correct 6 ms 1456 KB Output is correct
20 Correct 5 ms 1356 KB Output is correct
21 Correct 9 ms 1544 KB Output is correct
22 Correct 7 ms 1636 KB Output is correct
23 Correct 7 ms 1612 KB Output is correct
24 Correct 6 ms 1484 KB Output is correct
25 Correct 7 ms 1580 KB Output is correct
26 Correct 8 ms 1612 KB Output is correct
27 Correct 10 ms 1616 KB Output is correct
28 Correct 10 ms 1612 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 300 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 304 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 296 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 0 ms 332 KB Output is correct
12 Correct 0 ms 332 KB Output is correct
13 Correct 0 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 6 ms 1228 KB Output is correct
17 Correct 7 ms 1484 KB Output is correct
18 Correct 7 ms 1484 KB Output is correct
19 Correct 6 ms 1456 KB Output is correct
20 Correct 5 ms 1356 KB Output is correct
21 Correct 9 ms 1544 KB Output is correct
22 Correct 7 ms 1636 KB Output is correct
23 Correct 7 ms 1612 KB Output is correct
24 Correct 6 ms 1484 KB Output is correct
25 Correct 7 ms 1580 KB Output is correct
26 Correct 8 ms 1612 KB Output is correct
27 Correct 10 ms 1616 KB Output is correct
28 Correct 10 ms 1612 KB Output is correct
29 Correct 504 ms 37308 KB Output is correct
30 Correct 485 ms 37444 KB Output is correct
31 Correct 588 ms 39208 KB Output is correct
32 Correct 523 ms 38980 KB Output is correct
33 Correct 455 ms 34200 KB Output is correct
34 Correct 523 ms 39192 KB Output is correct
35 Correct 628 ms 54716 KB Output is correct
36 Correct 546 ms 49684 KB Output is correct
37 Correct 594 ms 54936 KB Output is correct