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- // Tinh S(n) = 1+2+3+...+n
- // Khai bao thu vien
- #include<stdio.h>
- #include<conio.h>
- void main()
- {
- // khai bao bien n
- int n;
- //nhap gia tri n
- scanf("%d",&n);
- //khai bao gia tri S
- long s=0;
- for(int i=0;i<=n;i++)
- {
- s=s+i;//Tinh S
- }
- // Xuat gia tri da tinh duoc
- printf("%ld\n",s);
- }
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