oj.uz

Submission #335302

# Submission time Handle Problem Language Result Execution time Memory
335302 2020-12-11T21:51:07 Z ChrisT The Kingdom of JOIOI (JOI17_joioi) C++17
100 / 100
 1134 ms 55020 KB 
#include <bits/stdc++.h>
using namespace std;
const int MN = 2e3 + 3;
int a[MN][MN],n,m,x,y;
bool __check (int mid) { //a <= mid + min
	int big = mid + a[x][y];
	int mn = 1e9, mx = -1e9;
	auto upd = [&] (int v) {mn = min(mn,v); mx = max(mx,v);};
	vector<int> ed(n+1);
	for (int i = 1; i <= n; i++) {
		while (ed[i] < m && a[i][ed[i]+1] <= big) ++ed[i];
	}
	for (int i = n-1; i >= 1; i--) {
		ed[i] = min(ed[i],ed[i+1]);
	}
	if (ed[x] < y) return false;
	for (int i = 1; i <= n; i++) {
		for (int j = ed[i] + 1; j <= m; j++) {
			upd(a[i][j]);
		}
	}
	return mx - mn <= mid;
}
bool _check (int mid) {
	if (__check(mid)) return true;
	reverse(a+1,a+1+n);
	x = n+1-x;
	bool ok = __check(mid);
	x = n+1-x;
	reverse(a+1,a+1+n);
	return ok;
}
bool check (int mid) {
	if (_check(mid)) return true;
	for (int i = 1; i <= n; i++) reverse(a[i]+1,a[i]+1+m);
	y = m+1-y;
	bool ok = _check(mid);
	y = m+1-y;
	for (int i = 1; i <= n; i++) reverse(a[i]+1,a[i]+1+m);
	return ok;
}
int main() {
	scanf ("%d %d",&n,&m); x=y=1;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= m; j++) {
			scanf ("%d",&a[i][j]);
			if (a[i][j] < a[x][y]) {x = i; y = j;}
		}
	}
	int low = 0, high = 2e9, mid, ans = -1;
	while (low <= high) {
		mid = (low + high) / 2;
		if (check(mid)) high = (ans = mid) - 1;
		else low = mid + 1; 
	}
	printf ("%d\n",ans);
	return 0;
}

Compilation message

joioi.cpp: In function 'int main()':
joioi.cpp:43:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   43 |  scanf ("%d %d",&n,&m); x=y=1;
      |  ~~~~~~^~~~~~~~~~~~~~~
joioi.cpp:46:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   46 |    scanf ("%d",&a[i][j]);
      |    ~~~~~~^~~~~~~~~~~~~~~

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 364 KB Output is correct
3 Correct 2 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 2 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 2 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 2 ms 364 KB Output is correct
10 Correct 2 ms 364 KB Output is correct
11 Correct 2 ms 364 KB Output is correct
12 Correct 2 ms 364 KB Output is correct
13 Correct 2 ms 364 KB Output is correct
14 Correct 2 ms 364 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 364 KB Output is correct
3 Correct 2 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 2 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 2 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 2 ms 364 KB Output is correct
10 Correct 2 ms 364 KB Output is correct
11 Correct 2 ms 364 KB Output is correct
12 Correct 2 ms 364 KB Output is correct
13 Correct 2 ms 364 KB Output is correct
14 Correct 2 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 9 ms 2028 KB Output is correct
17 Correct 18 ms 2156 KB Output is correct
18 Correct 24 ms 2156 KB Output is correct
19 Correct 22 ms 2156 KB Output is correct
20 Correct 21 ms 1900 KB Output is correct
21 Correct 39 ms 2284 KB Output is correct
22 Correct 32 ms 2284 KB Output is correct
23 Correct 39 ms 2284 KB Output is correct
24 Correct 28 ms 2028 KB Output is correct
25 Correct 37 ms 2284 KB Output is correct
26 Correct 26 ms 2312 KB Output is correct
27 Correct 33 ms 2284 KB Output is correct
28 Correct 31 ms 2284 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 364 KB Output is correct
3 Correct 2 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 2 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 2 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 2 ms 364 KB Output is correct
10 Correct 2 ms 364 KB Output is correct
11 Correct 2 ms 364 KB Output is correct
12 Correct 2 ms 364 KB Output is correct
13 Correct 2 ms 364 KB Output is correct
14 Correct 2 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 9 ms 2028 KB Output is correct
17 Correct 18 ms 2156 KB Output is correct
18 Correct 24 ms 2156 KB Output is correct
19 Correct 22 ms 2156 KB Output is correct
20 Correct 21 ms 1900 KB Output is correct
21 Correct 39 ms 2284 KB Output is correct
22 Correct 32 ms 2284 KB Output is correct
23 Correct 39 ms 2284 KB Output is correct
24 Correct 28 ms 2028 KB Output is correct
25 Correct 37 ms 2284 KB Output is correct
26 Correct 26 ms 2312 KB Output is correct
27 Correct 33 ms 2284 KB Output is correct
28 Correct 31 ms 2284 KB Output is correct
29 Correct 785 ms 37384 KB Output is correct
30 Correct 765 ms 37740 KB Output is correct
31 Correct 691 ms 39276 KB Output is correct
32 Correct 796 ms 39456 KB Output is correct
33 Correct 689 ms 34284 KB Output is correct
34 Correct 809 ms 39276 KB Output is correct
35 Correct 954 ms 54892 KB Output is correct
36 Correct 1104 ms 49772 KB Output is correct
37 Correct 1134 ms 55020 KB Output is correct