Submission #362040

#	Time	Username	Problem	Language	Result	Execution time	Memory
362040		Olerinskiy	The Kingdom of JOIOI (JOI17_joioi)	C++17	15 / 100	7 ms	1772 KiB

joioi

#include <iostream>
#include <iomanip>
#include <algorithm>
#include <bitset>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <cmath>
#include <time.h>
#include <random>
#include <string>
#include <cassert> 
#include <vector>
#include <ostream>
#include <istream>
#include <stack>
#include <deque>
#include <queue>
#include <functional>
#include <chrono>
#include <stack>
#include <limits>

using namespace std;

#define int long long
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define pii pair<int, int>
#define ld long double

istream& operator>> (istream& in, pii& b) {
    in >> b.first >> b.second;
    return in;
}

ostream& operator<< (ostream& out, const pii& b) {
    out << "{" << b.first << ", " << b.second << "}";
    return out;
}

template<typename T> ostream& operator<< (ostream& out, const vector<T>& a) {
    for (auto k : a) out << k << " ";
    return out;
}

template <typename T1, typename T2> inline bool chkmin(T1 &x, const T2 &y) {if (x > y) {x = y; return 1;} return 0;}
template <typename T1, typename T2> inline bool chkmax(T1 &x, const T2 &y) {if (x < y) {x = y; return 1;} return 0;}

#ifdef LOCAL
    #define dbg(x) cout << #x << " : " << (x) << endl;
    const long long INF = 1e18;
    // const long long mod = 2600000069;
    // const long long p = 10;
#else
    #define dbg(x) 57
    const long long INF = 1e18;
    // const long long mod = 2600000069;  
    // const long long p = 179;
#endif

const ld PI = 4 * atan(1);

#define time clock() / (double) CLOCKS_PER_SEC

// #pragma GCC optimize("Ofast,no-stack-protector")
// #pragma GCC target("sse,sse2,sse3,sse3,sse4")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC optimize("fast-math")
// #pragma GCC target("avx2")

mt19937 gen(chrono::high_resolution_clock::now().time_since_epoch().count());

#ifdef LOCAL 
    const int N = 550;
#else
    const int N = 2010;
#endif

int n, m;
int a[N][N];
int mn = INF, mx = -INF;

bool check(int d) {
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (a[i][j] - mn > d && mx - a[i][j] > d) {
                return 0;
            }
        }
    }
    int pos;
    bool ok;

    // mn in upper left
    ok = 1;
    pos = -1;
    for (int i = n - 1; i >= 0; i--) {
        for (int j = 0; j < m; j++) {
            if (a[i][j] - mn <= d && mx - a[i][j] <= d) continue;
            if (a[i][j] - mn <= d) {
                chkmax(pos, j);
            } else if (j <= pos) {
                ok = 0;
                break;
            }
        }
        if (!ok) break;
    }
    if (ok) return 1;

    // mn in lower left
    ok = 1;
    pos = -1;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (a[i][j] - mn <= d && mx - a[i][j] <= d) continue;
            if (a[i][j] - mn <= d) {
                chkmax(pos, j);
            } else if (j <= pos) {
                ok = 0;
                break;
            }
        }
        if (!ok) break;
    }
    if (ok) return 1;

    // mx in upper left
    ok = 1;
    pos = -1;
    for (int i = n - 1; i >= 0; i--) {
        for (int j = 0; j < m; j++) {
            if (a[i][j] - mn <= d && mx - a[i][j] <= d) continue;
            if (mx - a[i][j] <= d) {
                chkmax(pos, j);
            } else if (j <= pos) {
                ok = 0;
                break;
            }
        }
        if (!ok) {
            break;
        }
    }
    if (ok) return 1;

    // mx in lower left
    ok = 1;
    pos = -1;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (a[i][j] - mn <= d && mx - a[i][j] <= d) continue;
            if (mx - a[i][j] <= d) {
                chkmax(pos, j);
            } else if (j <= pos) {
                ok = 0;
                break;
            }
        }
        if (!ok) break;
    }
    return ok;
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> m;
    int sz = 0;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cin >> a[i][j];
            chkmin(mn, a[i][j]);
            chkmax(mx, a[i][j]);
        }
    }
    int l = -1, r = mx - mn;
    while (r - l > 1) {
        int mid = (l + r) / 2;
        if (check(mid)) r = mid;
        else l = mid;
    }
    cout << r << "\n";
}
/*
4 4
1 12 6 11 
11 10 2 14 
10 1 9 20 
4 17 19 10
-> 11

8 6
23 23 10 11 16 21 
15 26 19 28 19 20 
25 26 28 16 15 11 
11 8 19 11 15 24 
14 19 15 14 24 11 
10 8 11 7 6 14
23 5 19 23 17 17 
18 11 21 14 20 16
-> 18
*/

Compilation message (stderr)

joioi.cpp: In function 'int main()':
joioi.cpp:172:9: warning: unused variable 'sz' [-Wunused-variable]
  172 |     int sz = 0;
      |         ^~

• Subtask 1: 15 / 15
• Subtask 2: 0 / 45
• Subtask 3: 0 / 40