Submission #648140

#	Time	Username	Problem	Language	Result	Execution time	Memory
648140		ghostwriter	The Kingdom of JOIOI (JOI17_joioi)	C++14	100 / 100	956 ms	16136 KiB

joioi

#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include <debug.h>
#else
#define debug(...)
#endif
#define ft front
#define bk back
#define st first
#define nd second
#define ins insert
#define ers erase
#define pb push_back
#define pf push_front
#define _pb pop_back
#define _pf pop_front
#define lb lower_bound
#define ub upper_bound
#define mtp make_tuple
#define bg begin
#define ed end
#define all(x) (x).bg(), (x).ed()
#define sz(x) (int)(x).size()
typedef long long ll; typedef unsigned long long ull;
typedef double db; typedef long double ldb;
typedef pair<int, int> pi; typedef pair<ll, ll> pll;
typedef vector<int> vi; typedef vector<ll> vll; typedef vector<pi> vpi; typedef vector<pll> vpll;
typedef string str;
template<typename T> T gcd(T a, T b) { return (b == 0? a : gcd(b, a % b)); }
template<typename T> T lcm(T a, T b) { return a / gcd(a, b) * b; }
#define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
#define FOS(i, r, l) for (int (i) = (r); (i) >= (l); --(i))
#define FRN(i, n) for (int (i) = 0; (i) < (n); ++(i))
#define FSN(i, n) for (int (i) = (n) - 1; (i) >= 0; --(i))
#define EACH(i, x) for (auto &(i) : (x))
#define WHILE while
#define file "TEST"
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
ll rand(ll l, ll r) { return uniform_int_distribution<ll>(l, r)(rd); }
/*
----------------------------------------------------------------
    END OF TEMPLATE
----------------------------------------------------------------
    Tran The Bao - ghostwriter
    Training for VOI23 gold medal
----------------------------------------------------------------
    DIT ME CHUYEN BAO LOC
----------------------------------------------------------------
*/
const int oo = 1e9 + 5;
const int N = 2e3 + 1;
int h, w, a[N][N], mx = 0, my = 0;
bool check(int x) {
	int len = w, minv = oo, maxv = -oo;
	FOS(i, h, 1) {
		int j = 1, clen = len;
		WHILE(a[mx][my] - a[i][j] <= x && clen--) ++j;
		--j;
		FOR(z, j + 1, w) {
			minv = min(minv, a[i][z]);
			maxv = max(maxv, a[i][z]);
		}
		len = j;
	}
	if (minv == oo || maxv - minv <= x) return 1;
	len = w; minv = oo; maxv = -oo;
	FOR(i, 1, h) {
		int j = 1, clen = len;
		WHILE(a[mx][my] - a[i][j] <= x && clen--) ++j;
		--j;
		FOR(z, j + 1, w) {
			minv = min(minv, a[i][z]);
			maxv = max(maxv, a[i][z]);
		}
		len = j;
	}
	if (minv == oo || maxv - minv <= x) return 1;
	len = w; minv = oo; maxv = -oo;
	FOS(i, h, 1) {
		int j = w, clen = len;
		WHILE(a[mx][my] - a[i][j] <= x && clen--) --j;
		++j;
		FOR(z, 1, j - 1) {
			minv = min(minv, a[i][z]);
			maxv = max(maxv, a[i][z]);
		}
		len = w - j + 1;
	}
	if (minv == oo || maxv - minv <= x) return 1;
	len = w; minv = oo; maxv = -oo;
	FOR(i, 1, h) {
		int j = w, clen = len;
		WHILE(a[mx][my] - a[i][j] <= x && clen--) --j;
		++j;
		FOR(z, 1, j - 1) {
			minv = min(minv, a[i][z]);
			maxv = max(maxv, a[i][z]);
		}
		len = w - j + 1;
	}
	if (minv == oo || maxv - minv <= x) return 1;
	return 0;
}
signed main() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    // freopen(file".inp", "r", stdin);
    // freopen(file".out", "w", stdout);
    cin >> h >> w;
    FOR(i, 1, h)
    FOR(j, 1, w)
    	cin >> a[i][j];
    FOR(i, 1, h)
    FOR(j, 1, w)
    	if (a[i][j] > a[mx][my])
    		tie(mx, my) = mtp(i, j);
    int l = 0, r = 1e9 - 1, ans = -1;
    WHILE(l <= r) {
    	int mid = l + (r - l) / 2;
    	if (check(mid)) {
    		ans = mid;
    		r = mid - 1;
    	}
    	else l = mid + 1;
    }
    cout << ans;
    return 0;
}
/*
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
----------------------------------------------------------------
From Benq:
    stuff you should look for
        * int overflow, array bounds
        * special cases (n=1?)
        * do smth instead of nothing and stay organized
        * WRITE STUFF DOWN
        * DON'T GET STUCK ON ONE APPROACH
----------------------------------------------------------------
*/

Compilation message (stderr)

joioi.cpp: In function 'bool check(int)':
joioi.cpp:33:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   33 | #define FOS(i, r, l) for (int (i) = (r); (i) >= (l); --(i))
      |                               ^
joioi.cpp:56:2: note: in expansion of macro 'FOS'
   56 |  FOS(i, h, 1) {
      |  ^~~
joioi.cpp:32:31: warning: unnecessary parentheses in declaration of 'z' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
joioi.cpp:60:3: note: in expansion of macro 'FOR'
   60 |   FOR(z, j + 1, w) {
      |   ^~~
joioi.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
joioi.cpp:68:2: note: in expansion of macro 'FOR'
   68 |  FOR(i, 1, h) {
      |  ^~~
joioi.cpp:32:31: warning: unnecessary parentheses in declaration of 'z' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
joioi.cpp:72:3: note: in expansion of macro 'FOR'
   72 |   FOR(z, j + 1, w) {
      |   ^~~
joioi.cpp:33:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   33 | #define FOS(i, r, l) for (int (i) = (r); (i) >= (l); --(i))
      |                               ^
joioi.cpp:80:2: note: in expansion of macro 'FOS'
   80 |  FOS(i, h, 1) {
      |  ^~~
joioi.cpp:32:31: warning: unnecessary parentheses in declaration of 'z' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
joioi.cpp:84:3: note: in expansion of macro 'FOR'
   84 |   FOR(z, 1, j - 1) {
      |   ^~~
joioi.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
joioi.cpp:92:2: note: in expansion of macro 'FOR'
   92 |  FOR(i, 1, h) {
      |  ^~~
joioi.cpp:32:31: warning: unnecessary parentheses in declaration of 'z' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
joioi.cpp:96:3: note: in expansion of macro 'FOR'
   96 |   FOR(z, 1, j - 1) {
      |   ^~~
joioi.cpp: In function 'int main()':
joioi.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
joioi.cpp:110:5: note: in expansion of macro 'FOR'
  110 |     FOR(i, 1, h)
      |     ^~~
joioi.cpp:32:31: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
joioi.cpp:111:5: note: in expansion of macro 'FOR'
  111 |     FOR(j, 1, w)
      |     ^~~
joioi.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
joioi.cpp:113:5: note: in expansion of macro 'FOR'
  113 |     FOR(i, 1, h)
      |     ^~~
joioi.cpp:32:31: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
joioi.cpp:114:5: note: in expansion of macro 'FOR'
  114 |     FOR(j, 1, w)
      |     ^~~

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