This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
//Original Code:
//#include <numeric>
//#include <iostream>
//#include <algorithm>
//#include <cmath>
//#include <stdio.h>
//#include <stdlib.h>
//#include <vector>
//#include <map>
//#include <queue>
//#include <set>
//#include <string>
//#include <string.h>
//#include <stack>
//#include <assert.h>
//#include <bitset>
//#include <time.h>
//#define Endl endl
//#define mp make_pair
//#define mt make_tuple
//#define ll long long
//#define ull unsigned long long
//#define pii pair<int,int>
//#define over(A) {cout<<A<<endl;exit(0);}
//#define all(A) A.begin(),A.end()
//#define quickcin ios_base::sync_with_stdio(false);
//const int mod=1000000007;
//const int gmod=3;
//const int inf=1039074182;
//const double eps=1e-9;
//const double pi=3.141592653589793238462643383279;
//const ll llinf=2LL*inf*inf;
//template <typename T1,typename T2> inline void chmin(T1 &x,T2 b) {if(b<x) x=b;}
//template <typename T1,typename T2> inline void chmax(T1 &x,T2 b) {if(b>x) x=b;}
//inline void chadd(int &x,int b) {x+=b-mod;x+=(x>>31 & mod);}
//template <typename T1,typename T2> inline void chadd(T1 &x,T2 b) {x+=b;if(x>=mod) x-=mod;}
//template <typename T1,typename T2> inline void chmul(T1 &x,T2 b) {x=1LL*x*b%mod;}
//template <typename T1,typename T2> inline void chmod(T1 &x,T2 b) {x%=b,x+=b;if(x>=b) x-=b;}
//template <typename T> inline T mabs(T x) {return (x<0?-x:x);}
//using namespace std;
//int n,m;
//int a[2005][2005];
//int b[2005][2005];
//int bel[2005][2005];
//pair<int,pii> mn,mx;
//int res;
//
//inline bool check(int mid)
//{
// int x=mn.first,y=mx.first;
// int pre=m;
// for(int i=0;i<n;i++)
// {
// for(int j=0;j<pre;j++)
// {
// if(a[i][j]-x>mid)
// {
// pre=j;
// break;
// }
// }
// for(int j=pre;j<m;j++)
// {
// if(y-a[i][j]>mid) return false;
// }
// }
// return true;
//}
//
//void solve()
//{
// if(mn.first>=mx.first && mn.second>=mx.second) return;
// int l=0,r=res-1,mid;
// while(l<=r)
// {
// mid=l+r>>1;
// if(check(mid))
// {
// res=mid;
// r=mid-1;
// }
// else
// {
// l=mid+1;
// }
// }
//}
//
//int main()
//{
// // freopen("input.txt","r",stdin);
// cin>>n>>m;
// mn.first=inf;
// mx.first=-inf;
// for(int i=0;i<n;i++)
// {
// for(int j=0;j<m;j++)
// {
// scanf("%d",a[i]+j);
// chmax(mx,mp(a[i][j],mp(i,j)));
// chmin(mn,mp(a[i][j],mp(i,j)));
// }
// }
// res=mx.first-mn.first;
// for(int _=0;_<4;_++)
// {
// for(int i=0;i<n;i++)
// {
// for(int j=0;j<m;j++)
// {
// b[j][n-1-i]=a[i][j];
// }
// }
// memcpy(a,b,sizeof(b));
// swap(mx.second.first,mx.second.second);
// mx.second.second=n-1-mx.second.second;
// swap(mn.second.first,mn.second.second);
// mn.second.second=n-1-mn.second.second;
// swap(n,m);
// solve();
// }
// cout<<res<<endl;
// return 0;
//}
//substituted with C++ Inliner
#include <numeric>
#include <iostream>
#include <algorithm>
#include <cmath>
#include <stdio.h>
#include <stdlib.h>
#include <vector>
#include <map>
#include <queue>
#include <set>
#include <string>
#include <string.h>
#include <stack>
#include <assert.h>
#include <bitset>
#include <time.h>
#define Endl endl
#define mp make_pair
#define mt make_tuple
#define ll long long
#define ull unsigned long long
#define pii pair<int,int>
#define over(A) {cout<<A<<endl;exit(0);}
#define all(A) A.begin(),A.end()
#define quickcin ios_base::sync_with_stdio(false);
const int mod=1000000007;
const int gmod=3;
const int inf=1039074182;
const double eps=1e-9;
const double pi=3.141592653589793238462643383279;
const ll llinf=2LL*inf*inf;
template <typename T1,typename T2> inline void chmin(T1 &x,T2 b) {if(b<x) x=b;}
template <typename T1,typename T2> inline void chmax(T1 &x,T2 b) {if(b>x) x=b;}
inline void chadd(int &x,int b) {x+=b-mod;x+=(x>>31 & mod);}
template <typename T1,typename T2> inline void chadd(T1 &x,T2 b) {x+=b;if(x>=mod) x-=mod;}
template <typename T1,typename T2> inline void chmul(T1 &x,T2 b) {x=1LL*x*b%mod;}
template <typename T1,typename T2> inline void chmod(T1 &x,T2 b) {x%=b,x+=b;if(x>=b) x-=b;}
template <typename T> inline T mabs(T x) {return (x<0?-x:x);}
using namespace std;
int n,m;
int a[2005][2005];
int b[2005][2005];
int bel[2005][2005];
pair<int,pii> mn,mx;
int res;
inline bool check(int mid)
{
int x=mn.first,y=mx.first;
int pre=m;
for(int i=0;i<n;i++)
{
for(int j=0;j<pre;j++)
{
if(a[i][j]-x>mid)
{
pre=j;
break;
}
}
for(int j=pre;j<m;j++)
{
if(y-a[i][j]>mid) return false;
}
}
return true;
}
void solve()
{
if(mn.first>=mx.first && mn.second>=mx.second) return;
int l=0,r=res-1,mid;
while(l<=r)
{
mid=l+r>>1;
if(check(mid))
{
res=mid;
r=mid-1;
}
else
{
l=mid+1;
}
}
}
int main()
{
// // freopen("input.txt","r",stdin);
cin>>n>>m;
mn.first=inf;
mx.first=-inf;
for(int i=0;i<n;i++)
{
for(int j=0;j<m;j++)
{
scanf("%d",a[i]+j);
chmax(mx,mp(a[i][j],mp(i,j)));
chmin(mn,mp(a[i][j],mp(i,j)));
}
}
res=mx.first-mn.first;
for(int _=0;_<4;_++)
{
for(int i=0;i<n;i++)
{
for(int j=0;j<m;j++)
{
b[j][n-1-i]=a[i][j];
}
}
memcpy(a,b,sizeof(b));
swap(mx.second.first,mx.second.second);
mx.second.second=n-1-mx.second.second;
swap(mn.second.first,mn.second.second);
mn.second.second=n-1-mn.second.second;
swap(n,m);
solve();
}
cout<<res<<endl;
return 0;
}
Compilation message (stderr)
joioi.cpp: In function 'void solve()':
joioi.cpp:201:8: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
201 | mid=l+r>>1;
| ~^~
joioi.cpp: In function 'int main()':
joioi.cpp:224:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
224 | scanf("%d",a[i]+j);
| ~~~~~^~~~~~~~~~~~~
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