oj.uz

Submission #321721

# Submission time Handle Problem Language Result Execution time Memory
321721 2020-11-13T05:25:48 Z Kevin_Zhang_TW The Kingdom of JOIOI (JOI17_joioi) C++17
100 / 100
 2112 ms 63468 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define pb emplace_back
#define AI(i) begin(i), end(i)
#ifdef KEV
#define DE(args...) kout("[ " + string(#args) + " ] = ", args)
void kout() { cerr << endl; }
template <class T, class ...U> 
void kout(T a, U ...b) { cerr << a << ' ', kout(b...); }
template <class T>
void debug(T l, T r) { while (l != r) cerr << *l << " \n"[next(l) == r], ++l; }
#else
#define DE(...) 0
#define debug(...) 0
#endif

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

const int MAX_N = 2010, inf = 1e9;
//#define int ll
int n, m, a[MAX_N][MAX_N], res = inf;
int pfmx[MAX_N][MAX_N];
vector<pair<int,int>> id;
void init() {
	id.reserve(n * m);
	for (int i = 1;i <= n;++i)
		for (int j = 1;j <= m;++j)
			id.pb(i, j);
	sort(AI(id), [&](auto x, auto y) {
			return a[x.first][x.second] < a[y.first][y.second];
			});
}
		
void update() {
	for (int i = 1;i <= n;++i)
		for (int j = 1;j <= m;++j) {
			pfmx[i][j] = max({pfmx[i-1][j], pfmx[i][j-1], a[i][j]});
		}

	auto get = [&](pair<int,int> p) {
		return a[p.first][p.second];
	};

	for (int i = 0, j = 0;i+1 < id.size();++i) {


		auto valid = [&](pair<int,int> p) {
			return pfmx[p.first][p.second] <= get(id[i]);
		};

		while (j <= i && valid(id[j]))
			++j;

		if (valid(id[0]) && valid(id[i]))
			chmin(res, max(get(id[i]) - get(id[0]), get(id.back()) - get(id[j])));
	}
	chmin(res, get(id.back()) - get(id.front()));
}
int32_t main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	cin >> n >> m;
	for (int i = 1;i <= n;++i)
		for (int j = 1;j <= m;++j)
			cin >> a[i][j];

	init();
	update();

	for (int l = 1, r = n;l < r;++l, --r)
		swap(a[l], a[r]);

	for (auto &[x, y] : id) 
		x = n - x + 1;

	update();

	for (int i = 1;i <= n;++i) {
		for (int l = 1, r = m;l < r;++l, --r)
			swap(a[i][l], a[i][r]);
	}
	for (auto &[x, y] : id) 
		y = m - y + 1;

	update();
	for (int l = 1, r = n;l < r;++l, --r)
		swap(a[l], a[r]);
	for (auto &[x, y] : id) 
		x = n - x + 1;
	update();

	cout << res << '\n';
}

Compilation message

joioi.cpp: In function 'void update()':
joioi.cpp:48:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |  for (int i = 0, j = 0;i+1 < id.size();++i) {
      |                        ~~~~^~~~~~~~~~~

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 492 KB Output is correct
3 Correct 1 ms 492 KB Output is correct
4 Correct 1 ms 492 KB Output is correct
5 Correct 1 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 492 KB Output is correct
12 Correct 1 ms 492 KB Output is correct
13 Correct 1 ms 492 KB Output is correct
14 Correct 1 ms 492 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 492 KB Output is correct
3 Correct 1 ms 492 KB Output is correct
4 Correct 1 ms 492 KB Output is correct
5 Correct 1 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 492 KB Output is correct
12 Correct 1 ms 492 KB Output is correct
13 Correct 1 ms 492 KB Output is correct
14 Correct 1 ms 492 KB Output is correct
15 Correct 1 ms 492 KB Output is correct
16 Correct 8 ms 3180 KB Output is correct
17 Correct 13 ms 3180 KB Output is correct
18 Correct 13 ms 3180 KB Output is correct
19 Correct 12 ms 3180 KB Output is correct
20 Correct 11 ms 2924 KB Output is correct
21 Correct 13 ms 3180 KB Output is correct
22 Correct 13 ms 3180 KB Output is correct
23 Correct 13 ms 3180 KB Output is correct
24 Correct 11 ms 2924 KB Output is correct
25 Correct 13 ms 3180 KB Output is correct
26 Correct 16 ms 3180 KB Output is correct
27 Correct 13 ms 3180 KB Output is correct
28 Correct 13 ms 3180 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 492 KB Output is correct
3 Correct 1 ms 492 KB Output is correct
4 Correct 1 ms 492 KB Output is correct
5 Correct 1 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 492 KB Output is correct
12 Correct 1 ms 492 KB Output is correct
13 Correct 1 ms 492 KB Output is correct
14 Correct 1 ms 492 KB Output is correct
15 Correct 1 ms 492 KB Output is correct
16 Correct 8 ms 3180 KB Output is correct
17 Correct 13 ms 3180 KB Output is correct
18 Correct 13 ms 3180 KB Output is correct
19 Correct 12 ms 3180 KB Output is correct
20 Correct 11 ms 2924 KB Output is correct
21 Correct 13 ms 3180 KB Output is correct
22 Correct 13 ms 3180 KB Output is correct
23 Correct 13 ms 3180 KB Output is correct
24 Correct 11 ms 2924 KB Output is correct
25 Correct 13 ms 3180 KB Output is correct
26 Correct 16 ms 3180 KB Output is correct
27 Correct 13 ms 3180 KB Output is correct
28 Correct 13 ms 3180 KB Output is correct
29 Correct 1885 ms 60068 KB Output is correct
30 Correct 1797 ms 60792 KB Output is correct
31 Correct 1921 ms 63084 KB Output is correct
32 Correct 2011 ms 63084 KB Output is correct
33 Correct 1563 ms 55276 KB Output is correct
34 Correct 1960 ms 63084 KB Output is correct
35 Correct 2112 ms 63468 KB Output is correct
36 Correct 1686 ms 59116 KB Output is correct
37 Correct 2093 ms 63084 KB Output is correct