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- int main()
- {
- int i, j, x;
- fin >> n;
- rep(i,1,n)
- {
- fin >> x;
- f[x]++;
- }
- if(f[1] == n)
- {
- fout << 1;
- return 0;
- }
- if(f[2] == n)
- {
- fout << 2;
- return 0;
- }
- for(i = 1000; i >= 1; --i)
- f[i] += f[i + 1];
- rep(i,3,n)
- if(f[i] >= i)
- {
- fout << i;
- return 0;
- }
- return 0;
- }
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