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- #include <iostream>
- using namespace std;
- int main() {
- int i,N,t,a,b,bbest=0,abest=0;
- cin>>N;
- cin>>t;
- bbest=t;
- for (i=0;i<N;i++) {
- cin>>a>>b;
- abest=min(min(a,2*t+b)+abest,min(t+a,t+b)+bbest);
- bbest=min(min(b,2*t+a)+bbest,min(t+b,t+a)+abest);
- }
- cout<<bbest;
- return 0;
- }
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