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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int add[200010]={},val[200010]={};
  4. int main() {
  5.  
  6. 	int n;
  7. 	scanf("%d",&n);
  8. 	long double sz=1.0,sum=0.0;
  9. 	while(n--){
  10. 		int t;
  11. 		scanf("%d",&t);
  12. 		if (t==1){
  13. 			int vall,range;
  14. 			scanf("%d%d",&range,&vall);
  15. 			sum+=range*vall;
  16. 			add[--range]+=vall;
  17. 		}
  18. 		else if (t==2){
  19. 			int vall;
  20. 			scanf("%d",&vall);
  21. 			val[(int)sz]=vall;
  22. 			add[(int)sz]=0;
  23. 			sum+=vall;
  24. 			sz++;
  25. 		}
  26. 		else{
  27. 			sz--;
  28. 			sum-=val[(int)sz]+add[(int)sz];
  29. 			add[(int)sz-1]+=add[(int)sz];
  30. 		}
  31. 		cout<<setprecision(12)<<fixed<<sum/sz<<endl;
  32. //		printf("%.12lf \n",1.0*sum/sz);
  33. 	}
  34. 	return 0;
  35. }
Success #stdin #stdout 0s 17624KB
comments (?)
stdin
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6
2 1
1 2 20
2 2
1 2 -3
3
3
stdout
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0.500000000000
20.500000000000
14.333333333333
12.333333333333
17.500000000000
17.000000000000
https://ideone.com/dnAXXK
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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