oj.uz

Submission #50009

# Submission time Handle Problem Language Result Execution time Memory
50009 2018-06-06T08:13:31 Z Costin Andrei Oncescu(#1280, SpaimaCarpatilor) The Kingdom of JOIOI (JOI17_joioi) C++11
100 / 100
 2688 ms 159856 KB 
#include<bits/stdc++.h>

using namespace std;

int mi, ma, N, M, a[2009][2009];
bool dp[2009][2009], ok[2009][2009];
pair < int, int > pf[2009][2009], sf[2009][2009];

pair < int, int > combine (pair < int, int > &a, int val)
{
    return {min (a.first, val), max (a.second, val)};
}

bool check (int maxD)
{
    int lft[2], rgt[2];
    lft[0] = mi, rgt[0] = mi + maxD;
    lft[1] = ma - maxD, rgt[1] = ma;
    for (int up = 0; up < 2; up ++)
    {
        for (int j=1; j<=M; j++)
            for (int i=0; i<=N; i++)
                ok[j][i] = (pf[j][i].first >= lft[up] && pf[j][i].second <= rgt[up] &&
                    sf[j][i + 1].first >= lft[up ^ 1] && sf[j][i + 1].second <= rgt[up ^ 1]);
        for (int direction = 0; direction < 2; direction ++)
        {
            for (int i=0; i<=N; i++)
                dp[1][i] = ok[1][i] | (i > 0 ? dp[1][i - 1] : 0);
            for (int i=2; i<=M; i++)
                for (int j=0; j<=N; j++)
                    dp[i][j] = (ok[i][j] & dp[i - 1][j]) | (j > 0 ? dp[i][j - 1] : 0);
            if (dp[M][N]) return 1;
            for (int i=1; i<=M; i++)
                reverse (ok[i], ok[i] + N + 1);
        }
    }
    return 0;
}

int main ()
{
//freopen ("input", "r", stdin);
//freopen ("output", "w", stdout);

scanf ("%d %d", &N, &M);
for (int i=1; i<=N; i++)
    for (int j=1; j<=M; j++)
    {
        scanf ("%d", &a[i][j]);
        if (i + j == 2) mi = ma = a[i][j];
        else mi = min (mi, a[i][j]), ma = max (ma, a[i][j]);
    }
for (int j=1; j<=M; j++)
{
    pf[j][0] = {ma, mi}, sf[j][N + 1] = {ma, mi};
    for (int i=1; i<=N; i++)
        pf[j][i] = combine (pf[j][i - 1], a[i][j]);
    for (int i=N; i>=1; i--)
        sf[j][i] = combine (sf[j][i + 1], a[i][j]);
}
int p = 0, u = ma - mi - 1, mij, ras = ma - mi;
while (p <= u)
{
    mij = (p + u) >> 1;
    if (check (mij)) ras = mij, u = mij - 1;
    else p = mij + 1;
}
printf ("%d\n", ras);
return 0;
}

Compilation message

joioi.cpp: In function 'int main()':
joioi.cpp:45:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf ("%d %d", &N, &M);
 ~~~~~~^~~~~~~~~~~~~~~~~
joioi.cpp:49:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf ("%d", &a[i][j]);
         ~~~~~~^~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 484 KB Output is correct
3 Correct 2 ms 560 KB Output is correct
4 Correct 3 ms 764 KB Output is correct
5 Correct 3 ms 828 KB Output is correct
6 Correct 3 ms 828 KB Output is correct
7 Correct 3 ms 832 KB Output is correct
8 Correct 3 ms 832 KB Output is correct
9 Correct 2 ms 832 KB Output is correct
10 Correct 2 ms 832 KB Output is correct
11 Correct 2 ms 832 KB Output is correct
12 Correct 2 ms 832 KB Output is correct
13 Correct 2 ms 832 KB Output is correct
14 Correct 2 ms 832 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 484 KB Output is correct
3 Correct 2 ms 560 KB Output is correct
4 Correct 3 ms 764 KB Output is correct
5 Correct 3 ms 828 KB Output is correct
6 Correct 3 ms 828 KB Output is correct
7 Correct 3 ms 832 KB Output is correct
8 Correct 3 ms 832 KB Output is correct
9 Correct 2 ms 832 KB Output is correct
10 Correct 2 ms 832 KB Output is correct
11 Correct 2 ms 832 KB Output is correct
12 Correct 2 ms 832 KB Output is correct
13 Correct 2 ms 832 KB Output is correct
14 Correct 2 ms 832 KB Output is correct
15 Correct 5 ms 3024 KB Output is correct
16 Correct 10 ms 4304 KB Output is correct
17 Correct 22 ms 4604 KB Output is correct
18 Correct 29 ms 4604 KB Output is correct
19 Correct 20 ms 4604 KB Output is correct
20 Correct 20 ms 4604 KB Output is correct
21 Correct 26 ms 4604 KB Output is correct
22 Correct 27 ms 4604 KB Output is correct
23 Correct 24 ms 4604 KB Output is correct
24 Correct 22 ms 4604 KB Output is correct
25 Correct 21 ms 4604 KB Output is correct
26 Correct 36 ms 4604 KB Output is correct
27 Correct 30 ms 4628 KB Output is correct
28 Correct 30 ms 4732 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 484 KB Output is correct
3 Correct 2 ms 560 KB Output is correct
4 Correct 3 ms 764 KB Output is correct
5 Correct 3 ms 828 KB Output is correct
6 Correct 3 ms 828 KB Output is correct
7 Correct 3 ms 832 KB Output is correct
8 Correct 3 ms 832 KB Output is correct
9 Correct 2 ms 832 KB Output is correct
10 Correct 2 ms 832 KB Output is correct
11 Correct 2 ms 832 KB Output is correct
12 Correct 2 ms 832 KB Output is correct
13 Correct 2 ms 832 KB Output is correct
14 Correct 2 ms 832 KB Output is correct
15 Correct 5 ms 3024 KB Output is correct
16 Correct 10 ms 4304 KB Output is correct
17 Correct 22 ms 4604 KB Output is correct
18 Correct 29 ms 4604 KB Output is correct
19 Correct 20 ms 4604 KB Output is correct
20 Correct 20 ms 4604 KB Output is correct
21 Correct 26 ms 4604 KB Output is correct
22 Correct 27 ms 4604 KB Output is correct
23 Correct 24 ms 4604 KB Output is correct
24 Correct 22 ms 4604 KB Output is correct
25 Correct 21 ms 4604 KB Output is correct
26 Correct 36 ms 4604 KB Output is correct
27 Correct 30 ms 4628 KB Output is correct
28 Correct 30 ms 4732 KB Output is correct
29 Correct 1445 ms 86396 KB Output is correct
30 Correct 1662 ms 86396 KB Output is correct
31 Correct 1584 ms 87164 KB Output is correct
32 Correct 1648 ms 87164 KB Output is correct
33 Correct 1187 ms 87164 KB Output is correct
34 Correct 1552 ms 87164 KB Output is correct
35 Correct 2524 ms 87292 KB Output is correct
36 Correct 1757 ms 112124 KB Output is correct
37 Correct 2688 ms 159856 KB Output is correct