Submission #706359

#	Time	Username	Problem	Language	Result	Execution time	Memory
706359		Baytoro	The Kingdom of JOIOI (JOI17_joioi)	C++17	0 / 100	1 ms	340 KiB

joioi

#include <bits/stdc++.h>
using namespace std;
#define ios ios::sync_with_stdio(false); cin.tie(NULL);cout.tie(NULL);
#define pb push_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define fr first
#define sc second
#define endl '\n'
#define ll long long
#define int long long
void fopn(string name){
	freopen((name+".in").c_str(),"r",stdin);
	freopen((name+".out").c_str(),"w",stdout);
}
const ll INF=1e18,mod=998244353;
const int N=2005;
int a[N][N],tmp[N][N];

int n,m;
int calc(int x){
	int mn=INF,mx=-INF;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++)
			mn=min(mn,tmp[i][j]),mx=max(mx,tmp[i][j]);
	}
	for(int i=1, l=m+1;i<=n;i++){
		for(int j=1;j<l;j++){
			if(tmp[i][j]-mn>x){
				l=j;
				break;
			}
		}
		for(int j=l+1;j<=m;j++){
			if(mx-tmp[i][j]>x) return false;
		}
	}
	return true;
}
int check(int x){
	for(int i=1;i<=n;i++) 
		for(int j=1;j<=m;j++) 
			tmp[i][j]=a[i][j];
	for(int I=0;I<2;I++){
		for(int J=0;J<2;J++){
			if(calc(x)) return true;
			for(int i=1;i<=n;i++){
				for(int l=1,r=m;l<r;l++,r--){
					swap(tmp[i][l],tmp[i][r]);
				}
			}
		}
		for(int i=1;i<=n;i++)
			for(int j=1;j<=m;j++)
				tmp[i][j]=-tmp[i][j];
	}
	return false;
}
void solve(){
	cin>>n>>m;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			cin>>a[i][j];
		}
	}
	int l=-1,r=1e9;
	while(r-l>1){
		int md=(l+r)/2;
		if(check(md)) r=md;
		else l=md;
	}
	cout<<r;
	
}
main(){
	//fopn("cbarn");
	ios;
	int T=1;
	//cin>>T;
	while(T--){
		solve();
	}
}

Compilation message (stderr)

joioi.cpp:75:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   75 | main(){
      | ^~~~
joioi.cpp: In function 'void fopn(std::string)':
joioi.cpp:13:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  freopen((name+".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
joioi.cpp:14:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |  freopen((name+".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 45
• Subtask 3: 0 / 40