제출 #1299161

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1299161		daotuankhoi	The Kingdom of JOIOI (JOI17_joioi)	C++20	100 / 100	1622 ms	31832 KiB

joioi

#include <bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define ll long long

#ifdef LOCAL
#include "algo/debug.h"
#else
#define debug(...) 42
#endif

template <class T> bool ckmax(T &a, T b) { return a < b ? (a = b, true) : false; }
template <class T> bool ckmin(T &a, T b) { return a > b ? (a = b, true) : false; }

const int MAXN = 2005;

int a[MAXN][MAXN], b[MAXN][MAXN], lim = 0, h, w;

void flip() {
    for (int i = 1; i <= h; i++) {
        for (int j = 1; j <= w; j++) {
            b[j][h - i + 1] = a[i][j];
        }
    }
    swap(h, w);
    for (int i = 1; i <= h; i++) {
        for (int j = 1; j <= w; j++) {
            a[i][j] = b[i][j];
        }
    }
}

bool ok(int val) {
    int curMax = 0, mx = 0, mn = 1e9, pos = w;
    for (int i = 1; i <= h; i++) {
        for (int j = 1; j <= pos; j++) {
            if (lim - a[i][j] > val) {
                pos = j - 1;
                break;
            }
            ckmax(curMax, a[i][j]);
        }
        for (int j = pos + 1; j <= w; j++) {
            ckmax(mx, a[i][j]);
            ckmin(mn, a[i][j]);
        }
    }
    return (curMax == lim && mx - mn <= val);
}

bool check(int val) {
    for (int i = 0; i < 4; i++) {
        if (ok(val)) return 1;
        flip();
    }
    return 0;
}

int main() {
    #define NAME "test"
    if (fopen(NAME".inp", "r")) {
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> h >> w;
    for (int i = 1; i <= h; i++) {
        for (int j = 1; j <= w; j++) {
            cin >> a[i][j];
            ckmax(lim, a[i][j]);
        }
    }
    int l = 0, r = 1e9, ans;
    while (l <= r) {
        int mid = (l + r) >> 1;
        if (check(mid)) r = (ans = mid) - 1;
        else l = mid + 1;
    }
    cout << ans << '\n';
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

joioi.cpp: In function 'int main()':
joioi.cpp:65:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
joioi.cpp:66:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |         freopen(NAME".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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