Submission #1312876

#	Time	Username	Problem	Language	Result	Execution time	Memory
1312876		ulvix	Maxcomp (info1cup18_maxcomp)	C++20	100 / 100	97 ms	32088 KiB

maxcomp

// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>
#ifdef ULVI
    #include "debug.hpp"
#else
    #define db(...)
    #define dbv(v)
    #define line()
#endif
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define ff first
#define ss second
#define enld endl
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef pair<ll,ll> pll;
const ll sz=2e5+100;
const ll lg=20;
const ll mod=1e9+7;
const ll inf=1e18;
template<class T>
using indexed_set=tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll f(ll n,ll m,vector<vector<ll>> v){
    vector<vector<ll>> prefmn(n+5,vector<ll>(m+5,inf));
    vector<vector<ll>> prefmx(n+5,vector<ll>(m+5,-inf));
    for(ll i=1;i<=n;i++){
        for(ll j=1;j<=m;j++){
            prefmn[i][j]=min({prefmn[i-1][j],prefmn[i][j-1],v[i][j]-i-j});
            prefmx[i][j]=max({prefmx[i-1][j],prefmx[i][j-1],v[i][j]+i+j});
        }
    }
    ll ans=-1;
    for(ll i=1;i<=n;i++){
        for(ll j=1;j<=m;j++){
            ll mn=min(prefmn[i-1][j],prefmn[i][j-1]);
            ll mx=max(prefmx[i-1][j],prefmx[i][j-1]);
            ll o=v[i][j]-i-j-mn-1;
            ll p=mx-v[i][j]-i-j-1;
            ans=max({ans,o,p});
        }
    }
    return ans;
}
void solve(){
    ll n,m;
    cin>>n>>m;
    vector<vector<ll>> v(n+1,vector<ll>(m+1));
    for(ll i=1;i<=n;i++){
        for(ll j=1;j<=m;j++) cin>>v[i][j];
    }
    ll ans=f(n,m,v);
    for(ll i=1;i<=n;i++) reverse(v[i].begin()+1,v[i].end());
    ans=max(ans,f(n,m,v));
    cout<<ans<<'\n';
}

int main(){
    // freopen("input.txt","r",stdin);
    // freopen("output.txt","w",stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll t=1;
    // cin>>t;
    for(ll _=1;_<=t;_++){
        // cout<<"Scenario #"<<_<<":\n";
        solve();
    }
}

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