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} ans = 0;
for (i = 0; i < n; i++){ a = queue[i]; len[a] = 1;
for (j = 0;j < n; j++)
if(graph[j][a] == 1 && len[j] + 1 >len[a]) len[a]= len[j] + 1; if (ans < len[a])
}
cout << ans << endl; return 0; }
ans= len[a];
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