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- Tr_i(n){
- if(n<=1) return(0);
- if(n=2) return(1);
- a=0
- b=1
- c=1
- for(i=1;i<=n-3;i++){
- d=a+b+c;
- a=b;
- b=c;
- c=d;
- }
- return c;
- }
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