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- #include<stdio.h>
- int main()
- {
- int a,b[101],i,j,count=0,temp;
- scanf("%d",&a);
- for(i=0;i<a;i++)
- {
- scanf("%d",&b[i]);
- }
- int max=b[1];
- for(i=1;i<a-1;i++)
- {
- for(j=i+1;j<a;j++)
- {
- if(b[j]>b[i])
- {
- temp=b[i];
- b[i]=b[j];
- b[j]=temp;
- }
- }
- }
- int k=1;
- while(b[0]<=b[k])
- {
- b[k]--;
- b[0]++;
- count++;
- if(b[0]>b[k])
- {
- k++;
- }
- if(b[0]>b[k+1])
- {
- break;
- }
- }
- printf("%d\n",count);
- }
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