Submission #44828

#	Time	Username	Problem	Language	Result	Execution time	Memory
44828		aome	Maxcomp (info1cup18_maxcomp)	C++17	100 / 100	231 ms	24428 KiB

maxcomp

#include <bits/stdc++.h>

using namespace std;

const int N = 1005;
const long long INF = 1e18;

int n, m;
long long a[N][N];
long long f1[N][N], f2[N][N];
long long res;

void reset() {
	for (int i = 0; i <= n + 1; ++i) {
		for (int j = 0; j <= m + 1; ++j) {
			f1[i][j] = f2[i][j] = -INF;
		}
	}
}

int main() {
	ios::sync_with_stdio(false);
	cin >> n >> m;
	for (int i = 1; i <= n; ++i) {
		for (int j = 1; j <= m; ++j) {
			cin >> a[i][j];
		}
	}
	res = -INF;
	reset();
	for (int i = 1; i <= n; ++i) {
		for (int j = 1; j <= m; ++j) {
			f1[i][j] = max(max(f1[i - 1][j], f1[i][j - 1]), -a[i][j] + i + j);
			f2[i][j] = max(max(f2[i - 1][j], f2[i][j - 1]), +a[i][j] + i + j);
			res = max(res, f1[i][j] + a[i][j] - i - j);
			res = max(res, f2[i][j] - a[i][j] - i - j);
		}
	}
	reset();
	for (int i = 1; i <= n; ++i) {
		for (int j = m; j >= 1; --j) {
			f1[i][j] = max(max(f1[i - 1][j], f1[i][j + 1]), -a[i][j] + i - j);
			f2[i][j] = max(max(f2[i - 1][j], f2[i][j + 1]), +a[i][j] + i - j);
			res = max(res, f1[i][j] + a[i][j] - i + j);
			res = max(res, f2[i][j] - a[i][j] - i + j);
		}
	}
	reset();
	for (int i = n; i >= 1; --i) {
		for (int j = 1; j <= m; ++j) {
			f1[i][j] = max(max(f1[i + 1][j], f1[i][j - 1]), -a[i][j] - i + j);
			f2[i][j] = max(max(f2[i + 1][j], f2[i][j - 1]), +a[i][j] - i + j);
			res = max(res, f1[i][j] + a[i][j] + i - j);
			res = max(res, f2[i][j] - a[i][j] + i - j);
		}
	}
	reset();
	for (int i = n; i >= 1; --i) {
		for (int j = m; j >= 1; --j) {
			f1[i][j] = max(max(f1[i + 1][j], f1[i][j + 1]), -a[i][j] - i - j);
			f2[i][j] = max(max(f2[i + 1][j], f2[i][j + 1]), +a[i][j] - i - j);
			res = max(res, f1[i][j] + a[i][j] + i + j);
			res = max(res, f2[i][j] - a[i][j] + i + j);
		}
	}
	cout << res - 1;
}

• Subtask 1: 15 / 15
• Subtask 2: 15 / 15
• Subtask 3: 30 / 30
• Subtask 4: 40 / 40