Submission #876584

#	Time	Username	Problem	Language	Result	Execution time	Memory
876584		ReLice	The Kingdom of JOIOI (JOI17_joioi)	C++17	100 / 100	608 ms	70772 KiB

joioi

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define pb push_back
#define endl "\n"
#define fr first
#define sc second
#define sz size()
#define ins insert
#define bc back()
#define str string
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ordered_set tree<ll, null_type,less<ll>, rb_tree_tag,tree_order_statistics_node_update>
//void fre(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
void start(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}
const ll inf=1e18+7;
const ll mod=1e9;
const ll N=2e3+7;
const ld eps=1e-9;
ll a[N][N],mx=0,mn=inf;
ll n,m;
ll i,j;

bool check(ll mid){
	ll lim=0;
	for(i=1;i<=n;i++){
		for(j=1;j<=m;j++){
			if(a[i][j]<mx-mid)lim=max(lim,j+1);
		}
		for(j=1;j<lim;j++){
			if(a[i][j]>mn+mid)return false;
		}
	}
	return true;
}
void flip1(){
    for(j=1;j<=m;++j)
        for(i=1;i<=n/2;++i)
            swap(a[n-i+1][j],a[i][j]);
}
void flip2(){
    for(i=1;i<=n;++i)
        for(j=1;j<=m/2;j++)
            swap(a[i][m-j+1],a[i][j]);
}
ll bin(){
	ll l=0,r=mx-mn;
	while(r-l>1){
		ll mid=(l+r)/2;
		if(check(mid))r=mid;
		else l=mid;
	}
	return r;
}
void solve(){
    cin>>n>>m;
    for(i=1;i<=n;i++){
		for(j=1;j<=m;j++){
			cin>>a[i][j];
			mx=max(mx,a[i][j]);
			mn=min(mn,a[i][j]);
		}
	}
	if(mn==mx){
		cout<<0<<endl;
		return;
	}
	ll ans=bin();
	flip1();
	ans=min(ans,bin());
	flip2();
	ans=min(ans,bin());
	flip1();
	ans=min(ans,bin());
	cout<<ans<<endl;
}

signed main(){
    start();
    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);
    ll t=1;
    //cin>>t;
    while(t--) solve();
    return 0;
}
/*









*/

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