Submission #1212328

#	Time	Username	Problem	Language	Result	Execution time	Memory
1212328		biank	The Kingdom of JOIOI (JOI17_joioi)	C++20	100 / 100	391 ms	142052 KiB

joioi

#include <bits/stdc++.h>

using namespace std;

#define forn(i,n) for(int i=0;i<int(n);i++)
#define forsn(i,s,n) for(int i=int(s);i<int(n);i++)
#define dforn(i,n) for(int i=int(n)-1;i>=0;i--)
#define dforsn(i,s,n) for(int i=int(n)-1;i>=int(s);i--)
#define fst first
#define snd second
#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()

typedef long long ll;
typedef vector<ll> vll;
typedef vector<int> vi;
typedef pair<int,int> ii;

const int INF=1e9+20;

vector<vi> rotate(const vector<vi> &a){
    int h=sz(a),w=sz(a[0]);
    vector<vi> b(w,vi(h));
    forn(i,h) forn(j,w){
        b[w-j-1][i]=a[i][j];
    }
    return b;
}

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    
    int h,w;
    cin>>h>>w;
    vector<vi> a(h,vi(w));
    forn(i,h) forn(j,w){
        cin>>a[i][j];
    }
    int mini=INF,maxi=-INF;
    forn(i,sz(a)) forn(j,sz(a[0])){
        mini=min(mini,a[i][j]);
        maxi=max(maxi,a[i][j]);
    }
    vector<vi> r[4];
    forn(t,4){
        r[t]=a;
        a=rotate(a);
    }
    vector<vi> suff[4];
    forn(t,4){
        int n=sz(r[t]),m=sz(r[t][0]);
        suff[t].assign(n,vi(m+1));
        forn(i,n){
            suff[t][i][m]=-INF;
            dforn(j,m) suff[t][i][j]=max(suff[t][i][j+1],r[t][i][j]);
        }
    }
    auto check=[&](int d){
        forn(t,4){
            int n=sz(r[t]),m=sz(r[t][0]);
            bool flag=maxi-r[t][0][0]<=d&&r[t][n-1][m-1]-mini<=d;
            if(!flag) continue;
            int p=m;
            forn(i,n){
                int j=0;
                while(j<p&&maxi-r[t][i][j]<=d) j++;
                if(suff[t][i][j]-mini>d){
                    flag=false;
                    break;
                }
                p=j;
            }
            if(flag) return true;
        }
        return false;
    };
    int lo=-1,hi=maxi-mini;
    while(hi-lo>1){
        int mid=(lo+hi)/2;
        if(check(mid)) hi=mid;
        else lo=mid;
    }
    cout<<hi<<'\n';
    
    return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 45 / 45
• Subtask 3: 40 / 40