oj.uz

Submission #376543

# Submission time Handle Problem Language Result Execution time Memory
376543 2021-03-11T16:36:31 Z smjleo The Kingdom of JOIOI (JOI17_joioi) C++14
15 / 100
 13 ms 1516 KB 
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
using namespace std;
#define int long long
#define nl '\n'
#define io ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
const int mod = 1000000007, mod2 = 998244353;

// change this
const int N = 2005;

int n, m, arr[N][N], k, mini = INT_MAX, maxi = INT_MIN;

bool can() {
    int ffp = 1e9;
    // confirm leftmost corner
    for (int i=0; i<n; i++) {
        // find first place where element > mini+k
        int fp = n;
        for (int j=0; j<m; j++) {
            if (arr[i][j] > mini + k) {
                fp = j;
                break;
            }
        }
        ffp = min(ffp, fp);
        // find last place where element < maxi-k
        int lp = -1;
        for (int j=m-1; j>=0; j--) {
            if (arr[i][j] < maxi - k) {
                lp = j;
                break;
            }
        }
        if (ffp < lp+1) return false;
    }
    return true;
}

void flipx() {
    for (int i=0; i<n; i++)
        for (int j=0; j<m/2; j++) swap(arr[i][j], arr[i][m-j-1]);
}

void flipy() {
    for (int i=0; i<n/2; i++) {
        for (int j=0; j<m; j++) swap(arr[i][j], arr[n-i-1][j]);
    }
}

int verify(int kk) {
    k = kk;

    bool res = false;

    for (bool _ : {0, 0}) {
        res |= can();
        flipx();
        res |= can();
        flipy();
    }
    
    return res;
}

signed main() {
    io;
    cin >> n >> m;
    for (int i=0; i<n; i++) {
        for (int j=0; j<m; j++) {
            cin >> arr[i][j];
            mini = min(mini, arr[i][j]);
            maxi = max(maxi, arr[i][j]);
        }
    }

    int l = 0, r = 1e9+5;
    while (l<r) {
        int mid = (l+r)/2;
        if (verify(mid)) r = mid;
        else l = mid+1;
    }
    cout << l << nl;
}

Compilation message

joioi.cpp: In function 'long long int verify(long long int)':
joioi.cpp:57:15: warning: unused variable '_' [-Wunused-variable]
   57 |     for (bool _ : {0, 0}) {
      |               ^

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 376 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 364 KB Output is correct

Subtask #2
0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 376 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 11 ms 1388 KB Output is correct
17 Correct 13 ms 1516 KB Output is correct
18 Correct 9 ms 1516 KB Output is correct
19 Correct 9 ms 1516 KB Output is correct
20 Incorrect 12 ms 1516 KB Output isn't correct
21 Halted 0 ms 0 KB -

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 376 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 11 ms 1388 KB Output is correct
17 Correct 13 ms 1516 KB Output is correct
18 Correct 9 ms 1516 KB Output is correct
19 Correct 9 ms 1516 KB Output is correct
20 Incorrect 12 ms 1516 KB Output isn't correct
21 Halted 0 ms 0 KB -