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- // Tinh k sao cho 1+2+...+k sao cho S(k)<n
- // Khai bao thu vien neu co
- #include<stdio.h>
- #include<conio.h>
- void main()
- {
- int n;
- scanf("%d",&n);
- int s=0;
- int a;
- for(int i=0;i<n;i++)
- {
- s=s+i;
- if(s<n)
- {
- a=i;
- }
- }
- printf("%d",a);
- }
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