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- #include <bits/stdc++.h>
- using namespace std;
- #define ll long long
- int main()
- {
- ll a[100005],c,d,e,f,i,j=0,k,l;
- cin>>c;
- for(i=0; i<c; i++)
- {
- cin>>a[i];
- }
- sort(a,a+c);
- for(i=1; i<c-1; i++)
- {
- if(a[i-1]+a[i]>a[i+1])
- j=1;
- }
- if(j) printf("YES\n");
- else printf("NO\n");
- return 0;
- }
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