48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
#include<iostream>
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using namespace std;
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const int Max = 25;
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int num[Max][Max];
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int s[20000];
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int dp[Max][20000];
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void get_s()
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{
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int cnt = 0;
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for (int i=0;i<(1<<20);++i)
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if ( ( i&(i<<1) )==0)
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s[cnt++] = i;
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}
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int main()
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{
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get_s();
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int n;
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while (cin>>n)
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{
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for (int i=0;i<n;++i)
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for (int j=0;j<n;++j)
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cin>>num[i][j];
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memset(dp,0,sizeof(dp));
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for (int i=0;i<n;++i)
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{
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for (int j=0;s[j]<(1<<n);++j)
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{
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for (int k=0;k<n;++k)
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if ( ( (s[j]>>k)&1)==1 )
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dp[i][j] += num[i][k];
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if (i)
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{
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int mx = 0;
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for (int k=0;s[k]<(1<<n);++k)
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if ( (s[k]&s[j])==0 && dp[i-1][k]>mx )
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mx = dp[i-1][k];
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dp[i][j] += mx;
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}
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}
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}
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int ans = 0;
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for (int i=0;s[i]<(1<<n);++i)
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ans = dp[n-1][i]>ans?dp[n-1][i]:ans;
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cout<<ans<<endl;
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}
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return 0;
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}
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