Submission #521328

#	Time	Username	Problem	Language	Result	Execution time	Memory
521328		lucri	Maxcomp (info1cup18_maxcomp)	C++17	100 / 100	394 ms	24664 KiB

maxcomp

#include <iostream>
using namespace std;
long long x[1010][1010],n,m,a[1010][1010],ans=-100000000000;
int main()
{
    cin>>n>>m;
    for(long long i=1;i<=n;++i)
        for(long long j=1;j<=m;++j)
        {
            cin>>a[i][j];
            a[i][j]+=i+j;
            x[i][j]=a[i][j];
        }
    for(long long i=n;i>=1;--i)
        for(long long j=m;j>=1;--j)
        {
            if(j<m)
                x[i][j]=min(x[i][j],x[i][j+1]);
            if(i<n)
                x[i][j]=min(x[i][j],x[i+1][j]);
            if(ans<a[i][j]-x[i][j]-1)
                ans=a[i][j]-x[i][j]-1;
        }
    for(long long i=n;i>=1;--i)
        for(long long j=m;j>=1;--j)
        {
            a[i][j]-=2*(i+j);
            x[i][j]=a[i][j];
            if(j<m)
                x[i][j]=max(x[i][j],x[i][j+1]);
            if(i<n)
                x[i][j]=max(x[i][j],x[i+1][j]);
            if(ans<x[i][j]-a[i][j]-1)
                ans=x[i][j]-a[i][j]-1;
        }
    for(long long i=1;i<=n;++i)
        for(long long j=m;j>=1;--j)
        {
            a[i][j]+=2*i;
            x[i][j]=a[i][j];
            if(j<m)
                x[i][j]=max(x[i][j],x[i][j+1]);
            if(i>1)
                x[i][j]=max(x[i][j],x[i-1][j]);
            if(ans<x[i][j]-a[i][j]-1)
                ans=x[i][j]-a[i][j]-1;
        }
    for(long long i=1;i<=n;++i)
        for(long long j=m;j>=1;--j)
        {
            a[i][j]+=2*j-2*i;
            x[i][j]=a[i][j];
            if(j<m)
                x[i][j]=min(x[i][j],x[i][j+1]);
            if(i>1)
                x[i][j]=min(x[i][j],x[i-1][j]);
            if(ans<a[i][j]-x[i][j]-1)
                ans=a[i][j]-x[i][j]-1;
        }
    cout<<ans;
    return 0;
}

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