Submission #922932

#	Time	Username	Problem	Language	Result	Execution time	Memory
922932		Ianis	Maxcomp (info1cup18_maxcomp)	C++17	0 / 100	1 ms	4444 KiB

maxcomp

#ifdef LOCAL
#include <iostream>
#include <fstream>
#include <iomanip>
#include <cassert>
#include <random>
#include <vector>
#include <queue>
#include <stack>
#include <set>
#include <map>
#else
#pragma GCC optimize("Ofast,unroll-loops")
#include <bits/stdc++.h>
#define cerr if (false) cerr 
#define endl '\n'
#endif

#define fi first
#define se second

#define sz(a) ((int)(a).size())
#define all(a) (a).begin(), (a).end()

#define lsb(x) (x & (-x))

#define bit(mask, i) (((mask) >> (i)) & 1)
#define popcount(x) __builtin_popcount(x)

#define YES cout << "YES" << endl
#define NO cout << "NO" << endl

using namespace std;

template <typename T>
bool ckmax(T &a, T b) { return a < b ? a = b, true : false; }
template <typename T>
bool ckmin(T &a, T b) { return a > b ? a = b, true : false; }

using ll = long long;
using pii = pair<int, int>;

const int NMAX = 1e3+5;

const int di[] = { 1, -1, 0, 0 };
const int dj[] = { 0, 0, 1, -1 };

struct Point {
   int val, i, j;
};

struct State {
   int max, min, cnt;

   int weight() const {
      return max - min - cnt;
   }

   State add(int val) {
      State s = *this;
      ckmax(s.max, val);
      ckmin(s.min, val);
      s.cnt++;
      return s;
   }
};

bool operator<(const State &s1, const State &s2) {
   return s1.weight() < s2.weight();
}

int n, m;
int a[NMAX][NMAX];
State dp[NMAX][NMAX];
bool vis[NMAX][NMAX];

void read() {
   cin >> n >> m;
   for (int i = 1; i <= n; i++) {
      for (int j = 1; j <= m; j++)
         cin >> a[i][j];
   }
}

int solve() {
   vector<Point> v;
   for (int i = 1; i <= n; i++) {
      for (int j = 1; j <= m; j++) {
         dp[i][j] = { 0, 0, 1 };
         v.push_back({ a[i][j], i, j });
      }
   }

   sort(all(v), [&](const Point &a, const Point &b) {
      return a.val < b.val;
   });

   for (auto [ val, i0, j0 ] : v) {
      vis[i0][j0] = true;
      for (int k = 0; k < 4; k++) {
         int i = i0 + di[k], j = j0 + dj[k];
         if (!vis[i][j])
            ckmax(dp[i][j], dp[i0][j0].add(val));
      }
   }

   int ans = -1;
   for (int i = 1; i <= n; i++) {
      for (int j = 1; j <= m; j++)
         ckmax(ans, dp[i][j].weight());
   }

   return ans;
}

signed main() {
#ifdef LOCAL
   freopen("input.txt", "r", stdin);
#endif
   ios_base::sync_with_stdio(false);
   cin.tie(0);
   cout.tie(0);
   
   read();
   cout << solve() << endl;

   return 0;
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 15
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40