28 lines
544 B
C++
28 lines
544 B
C++
#include <stdio.h>
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int main()
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{
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int i,a,n,sum,ans;
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while(~scanf("%d",&n))
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{
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for(i = 0,sum = 0; i<n; i++,sum+=a)
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scanf("%d",&a);
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for(i = 1; i<sum; i++)
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{
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if(sum==(1+i)*i/2)
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{
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ans = 1;
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break;
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}
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if(sum<(1+i)*i/2)
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{
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ans = i;
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break;
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}
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}
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if(sum == 2)
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ans = 2;
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printf("yes\n%d\n",ans);
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}
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return 0;
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}
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