Submission #197086

#	Time	Username	Problem	Language	Result	Execution time	Memory
197086		Pankin	Maxcomp (info1cup18_maxcomp)	C++14	60 / 100	148 ms	4372 KiB

maxcomp

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("-O3")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#define mp make_pair
#define ll long long
#define ld long double
#define pb push_back
#define fast_io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define fs first
#define sc second
#define getfiles ifstream cin("input.txt"); ofstream cout("output.txt");
#define endl '\n'
#define pii pair<int, int>

const int INF = 2000000005;
const ll BIG_INF = 2000000000000000005;
const int mod = 1000000007;
const int P = 31;
const ld PI = 3.141592653589793238462643;
const double eps = 1e-9;

using namespace std;
using namespace __gnu_pbds;

bool valid(int x, int y, int n, int m) {
    return x >= 0 && y >= 0 && x < n && y < m;
}

mt19937 rng(1999999973);

typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;

const int N = 1005;
int a[N][N], n, m, curVal[N], suf[N], pref[N], ans = 0;

inline void update(int x) {
    for (int i = 0; i < m; i++) {
        curVal[i] = min(curVal[i], a[x][i] - x);
    }
    int curMin = INF;
    for (int i = 0; i < m; i++) {
        curMin = min(curMin, curVal[i] - i);
        pref[i] = curMin;
    }
    curMin = INF;
    for (int i = m - 1; i >= 0; i--) {
        curMin = min(curMin, curVal[i] + i);
        suf[i] = curMin;
    }
}

inline void repeat() {
    for (int i = 0; i < N; i++) {
        curVal[i] = INF;
    }
    for (int x = 0; x < n; x++) {
        update(x);

        for (int y = 0; y < m; y++) {
            ans = max(ans, a[x][y] - pref[y] - y - x);
            if (y + 1 < n) {
                ans = max(ans, a[x][y] - suf[y + 1] + y - x);
            }
        }
    }
}

signed main() {
    fast_io;

    //getfiles;

    cin >> n >> m;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cin >> a[i][j];
        }
    }

    repeat();

    for (int i = 0; i < n; i++) {
        reverse(a[i], a[i] + m);
    }
    for (int i = 0; i < n - 1 - i; i++) {
        for (int j = 0; j < m; j++) {
            swap(a[i][j], a[n - 1 - i][j]);
        }
    }

    repeat();

    cout << ans - 1;

    return 0;
}

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