Submission #46250

#	Time	Username	Problem	Language	Result	Execution time	Memory
46250		qoo2p5	Maxcomp (info1cup18_maxcomp)	C++17	100 / 100	177 ms	8576 KiB

maxcomp

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int INF = (int) 1e9 + 1e6 + 123;
const ll LINF = (ll) 1e18 + 1e9 + 123;

#define rep(i, s, t) for (auto i = (s); i < (t); ++(i))
#define per(i, s, t) for (auto i = (s); i >= (t); --(i))
#define sz(x) ((int)(x).size())
#define mp make_pair
#define pb push_back

bool mini(auto &x, const auto &y) {
	if (y < x) {
		x = y;
		return 1;
	}
	return 0;
}

bool maxi(auto &x, const auto &y) {
	if (y > x) {
		x = y;
		return 1;
	}
	return 0;
}

void run();

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	run();
	return 0;
}

const int N = (int) 1000 + 5;

int n, m;
int a[N][N], dp[N][N];
bool vis[N][N];
const int dx[4] = {-1, 1, 0, 0};
const int dy[4] = {0, 0, -1, 1};

bool check(int i, int j) {
	return 0 <= min(i, j) && i < n && j < m;
}

void run() {
	rep(i, 0, N) rep(j, 0, N) dp[i][j] = INF;
	
	cin >> n >> m;
	rep(i, 1, n + 1) {
		rep(j, 1, m + 1) {
			cin >> a[i][j];
			dp[i][j] = a[i][j] + 1;
		}
	}
	
	rep(i, 1, n + 1) {
		rep(j, 1, m + 1) {
			mini(dp[i][j], min(dp[i - 1][j] + 1, dp[i][j - 1] + 1));
		}
		per(j, m, 1) {
			mini(dp[i][j], min(dp[i - 1][j] + 1, dp[i][j + 1] + 1));
		}
	}
	per(i, n, 1) {
		rep(j, 1, m + 1) {
			mini(dp[i][j], min(dp[i + 1][j] + 1, dp[i][j - 1] + 1));
		}
		per(j, m, 1) {
			mini(dp[i][j], min(dp[i + 1][j] + 1, dp[i][j + 1] + 1));
		}
	}
	
	int ans = -INF;
	rep(i, 1, n + 1) rep(j, 1, m + 1) maxi(ans, a[i][j] - dp[i][j]);
	cout << ans << "\n";
}

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