47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
#include <iostream>
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#include <algorithm>
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#include <cstdio>
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using namespace std;
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const int maxn=100000+5;
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int data[maxn];
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int main()
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{
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int m,p;
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while(scanf("%d%d",&m,&p)!=-1)
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{
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for(int i=0; i<m; i++)
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{
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scanf("%d",&data[i]);
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data[i]%=p;
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}
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sort(data,data+m);
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if(p-data[m-1]>data[m-2])
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printf("%d\n",data[m-1]+data[m-2]);
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else
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{
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int now=0;
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int ans=data[m-1]+data[m-2]-p;
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for(int i=m-1; i>=1; i--)
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{
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for(int j=now; j<i; j++)
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{
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if(p-data[i]>data[j])
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ans=max(data[i]+data[j],ans);
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else
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{
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if(j>0)
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now=j-1;
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break;
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}
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if(ans==p-1)
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break;
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}
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if(ans==p-1)
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break;
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}
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printf("%d\n",ans);
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}
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}
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return 0;
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}
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