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- #include <iostream>
- using namespace std;
- long long int thc(int n, int k){
- long long int sum1=1, sum2=1, sum3=1;
- for(int i=1; i<=n; i++){
- sum1*=i;
- }
- for(int i=1; i<=k; i++){
- sum2*=i;
- }
- for(int i=1; i<=n-k; i++){
- sum3*=i;
- }
- return sum1/(sum2*sum3);
- }
- int main(){
- int m, n;
- while(m!=-1 && n!=-1){
- cin >> m>> n;
- if(m!=-1 && n!=-1)
- cout<<thc(m, n)<<endl;
- }
- }
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