oj.uz

Submission #978817

# Submission time Handle Problem Language Result Execution time Memory
978817 2024-05-09T17:52:59 Z sleepntsheep The Kingdom of JOIOI (JOI17_joioi) C
100 / 100
 1377 ms 117784 KB 
#include<stdio.h>

#define N 2000
#define M 2000

int max(int i,int j){return i<j?j:i;}
int min(int i,int j){return i>j?j:i;}

int n, m, a[N][M], b[N][M], c[N][M], d[N][M], x, ii, jj;

int ok_(int a[][M], int ii, int jj)
{
    static int down[M][N];
    for(int i=0;i<m;++i)
    {
        down[i][0]=a[0][i];
        for(int j=1;j<n;++j)
            down[i][j]=min(down[i][j-1],a[j][i]);
    }

    int high = a[ii][jj];

    static int sep[M];
    int ptr=n-1;
    for(int i=0;i<m;++i)
    {
        while(ptr>=0&&down[i][ptr]+x<high)--ptr;
        sep[i]=ptr+1;
        if(jj == i && sep[i] <= ii)
            return 0;
    }

    int ioi_high=-1,ioi_low=1e9;
    for(int i=0;i<m;++i)for(int j=sep[i];j<n;++j)
    {
        ioi_high=max(ioi_high,a[j][i]);
        ioi_low=min(ioi_low,a[j][i]);
        if(ioi_low+x<ioi_high)
            return 0;
    }
    return 1;
}

int ok(int x0)
{
    x = x0;
    return ok_(a, ii, jj) || ok_(b, n-1-ii, jj) || ok_(c, ii, m-1-jj) || ok_(d, n-1-ii, m-1-jj);
}

int main()
{
    scanf("%d%d",&n,&m);
    for(int i=0;i<n;++i)for(int j=0;j<m;++j)
    {
        scanf("%d",a[i]+j), b[n-1-i][j]=a[i][j], c[i][m-1-j]=a[i][j], d[n-1-i][m-1-j]=a[i][j];
        if(a[i][j]>a[ii][jj])ii=i,jj=j;
    }

    int lb=-1,ub=1e9;
    while(ub-lb>1)
    {
        int mid=lb+(ub-lb)/2;
        if(ok(mid))ub=mid;
        else lb=mid;
    }
    printf("%d",ub);
}

Compilation message

joioi.c: In function 'main':
joioi.c:52:5: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |     scanf("%d%d",&n,&m);
      |     ^~~~~~~~~~~~~~~~~~~
joioi.c:55:9: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |         scanf("%d",a[i]+j), b[n-1-i][j]=a[i][j], c[i][m-1-j]=a[i][j], d[n-1-i][m-1-j]=a[i][j];
      |         ^~~~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8536 KB Output is correct
2 Correct 2 ms 8540 KB Output is correct
3 Correct 1 ms 8540 KB Output is correct
4 Correct 1 ms 8796 KB Output is correct
5 Correct 1 ms 8540 KB Output is correct
6 Correct 1 ms 8540 KB Output is correct
7 Correct 1 ms 8540 KB Output is correct
8 Correct 1 ms 8540 KB Output is correct
9 Correct 2 ms 8536 KB Output is correct
10 Correct 2 ms 8540 KB Output is correct
11 Correct 1 ms 8540 KB Output is correct
12 Correct 1 ms 8540 KB Output is correct
13 Correct 1 ms 8540 KB Output is correct
14 Correct 2 ms 8540 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8536 KB Output is correct
2 Correct 2 ms 8540 KB Output is correct
3 Correct 1 ms 8540 KB Output is correct
4 Correct 1 ms 8796 KB Output is correct
5 Correct 1 ms 8540 KB Output is correct
6 Correct 1 ms 8540 KB Output is correct
7 Correct 1 ms 8540 KB Output is correct
8 Correct 1 ms 8540 KB Output is correct
9 Correct 2 ms 8536 KB Output is correct
10 Correct 2 ms 8540 KB Output is correct
11 Correct 1 ms 8540 KB Output is correct
12 Correct 1 ms 8540 KB Output is correct
13 Correct 1 ms 8540 KB Output is correct
14 Correct 2 ms 8540 KB Output is correct
15 Correct 2 ms 10588 KB Output is correct
16 Correct 6 ms 17500 KB Output is correct
17 Correct 8 ms 17756 KB Output is correct
18 Correct 9 ms 17756 KB Output is correct
19 Correct 9 ms 17756 KB Output is correct
20 Correct 8 ms 17756 KB Output is correct
21 Correct 10 ms 17820 KB Output is correct
22 Correct 10 ms 17752 KB Output is correct
23 Correct 11 ms 17944 KB Output is correct
24 Correct 10 ms 17752 KB Output is correct
25 Correct 10 ms 17756 KB Output is correct
26 Correct 10 ms 17920 KB Output is correct
27 Correct 11 ms 17756 KB Output is correct
28 Correct 12 ms 17800 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8536 KB Output is correct
2 Correct 2 ms 8540 KB Output is correct
3 Correct 1 ms 8540 KB Output is correct
4 Correct 1 ms 8796 KB Output is correct
5 Correct 1 ms 8540 KB Output is correct
6 Correct 1 ms 8540 KB Output is correct
7 Correct 1 ms 8540 KB Output is correct
8 Correct 1 ms 8540 KB Output is correct
9 Correct 2 ms 8536 KB Output is correct
10 Correct 2 ms 8540 KB Output is correct
11 Correct 1 ms 8540 KB Output is correct
12 Correct 1 ms 8540 KB Output is correct
13 Correct 1 ms 8540 KB Output is correct
14 Correct 2 ms 8540 KB Output is correct
15 Correct 2 ms 10588 KB Output is correct
16 Correct 6 ms 17500 KB Output is correct
17 Correct 8 ms 17756 KB Output is correct
18 Correct 9 ms 17756 KB Output is correct
19 Correct 9 ms 17756 KB Output is correct
20 Correct 8 ms 17756 KB Output is correct
21 Correct 10 ms 17820 KB Output is correct
22 Correct 10 ms 17752 KB Output is correct
23 Correct 11 ms 17944 KB Output is correct
24 Correct 10 ms 17752 KB Output is correct
25 Correct 10 ms 17756 KB Output is correct
26 Correct 10 ms 17920 KB Output is correct
27 Correct 11 ms 17756 KB Output is correct
28 Correct 12 ms 17800 KB Output is correct
29 Correct 945 ms 100944 KB Output is correct
30 Correct 831 ms 99072 KB Output is correct
31 Correct 997 ms 101968 KB Output is correct
32 Correct 816 ms 101780 KB Output is correct
33 Correct 873 ms 98636 KB Output is correct
34 Correct 816 ms 101804 KB Output is correct
35 Correct 1377 ms 117784 KB Output is correct
36 Correct 1114 ms 111184 KB Output is correct
37 Correct 1226 ms 117692 KB Output is correct