http://poj.org/problem?id=2465 #include<iostream> using namespace std; inline int min(int a,int b) { return a<b?a:b; } int dis[112],price[112]; int l,n; void init() { n=0; cin>>l; while(cin>>dis[n]) cin>>price[n++]; price[n]=99999999; dis[n]=l; n++; } int doit() { int i,j,s,temp[212],p; int best[212]; for(i=0;i<201;i++) best[i]=-1; best[100]=0; for(s=dis[0],i=0;i<n;i++) { for(j=0;j<201;j++) temp[j]=-1; for(j=s;j<201;j++) temp[j-s]=best[j]; if(i<n-1) { p=-1; for(j=0;j<201;j++) { if(temp[j]>=0) { if(p<0||p>temp[j]) p=temp[j]; } if(p>=0&&(temp[j]<0||p<temp[j])) temp[j]=p; if(p>=0)p+=price[i]; } } for(j=0;j<201;j++) best[j]=temp[j]; s=dis[i+1]-dis[i]; } int ans=-1; for(j=100;j<201;j++) if(best[j]>=0&&(ans<0||best[j]<ans)) ans=best[j]; return ans; } int main() { int ans; init(); ans=doit(); if(ans<0) cout<<"Impossible"<<endl; else cout<<ans<<endl; return 0; }
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