oj.uz

Submission #143395

# Submission time Handle Problem Language Result Execution time Memory
143395 2019-08-13T23:18:44 Z osaaateiasavtnl The Kingdom of JOIOI (JOI17_joioi) C++14
0 / 100
 2 ms 376 KB 
#include<bits/stdc++.h>
using namespace std;
#define int long long 
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcount
const int N = 2007, INF = 1e9 + 7;
int n, m, x, y, mn = INF, a[N][N], r[N];
int suffmn[N][N], suffmx[N][N];
bool check_(int mid) {
    int mx = mn + mid;
    for (int i = 0; i < n; ++i) { r[i] = 0; while (r[i] < m && a[i][r[i]] <= mx) ++r[i]; }   
    for (int i = 0; i < n; ++i) {
        int MN = suffmn[i][r[i]], MX = suffmx[i][r[i]];
        int c = r[i];
        for (int ii = i - 1; ii >= 0; --ii) { c = min(c, r[ii]); MN = min(MN, suffmn[ii][c]); MX = max(MX, suffmx[ii][c]); }
        c = r[i];
        for (int ii = i + 1; ii < n; ++ii) { c = min(c, r[ii]); MN = min(MN, suffmn[ii][c]); MX = max(MX, suffmx[ii][c]); }
        if (MX - MN <= mid) return 1;
    }
    return 0;
}
void kek() {
    for (int i = 0; i < n; ++i) for (int j = 0; j < m / 2; ++j) swap(a[i][j], a[i][m - 1 - j]);
}
bool check(int mid) {
    if (check_(mid)) return 1;
    kek(); y = m - 1 - y;
    bool ans = check_(mid);
    kek(); y = m - 1 - y;
    return ans;
}
signed main() {
    #ifdef HOME
    freopen("input.txt", "r", stdin);
    #else
    ios_base::sync_with_stdio(0); cin.tie(0);
    #endif
    cin >> n >> m;
    for (int i = 0; i < n; ++i) for (int j = 0; j < m; ++j) { cin >> a[i][j]; mn = min(mn, a[i][j]); }
    for (int i = 0; i < n; ++i) for (int j = 0; j < m; ++j) if (a[i][j] == mn) { x = i; y = j; break; }
    for (int i = 0; i < n; ++i) {
        suffmn[i][m] = INF; for (int j = m - 1; j >= 0; --j) suffmn[i][j] = min(suffmn[i][j + 1], a[i][j]);
        suffmx[i][m] = -INF; for (int j = m - 1; j >= 0; --j) suffmx[i][j] = max(suffmx[i][j + 1], a[i][j]);
    }
    int l = -1, r = INF;
    while (l < r - 1) { int mid = (l + r) >> 1; if (check(mid)) r = mid; else l = mid; }
    cout << r << '\n';
}

Subtask #1
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Incorrect 2 ms 376 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Incorrect 2 ms 376 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Incorrect 2 ms 376 KB Output isn't correct
3 Halted 0 ms 0 KB -