Uva 组装电脑 12124 - Assemble
主要运用二分法查找最优解
1 #include<iostream> 2 #include<string> 3 #include<vector> 4 #include<map> 5 using namespace std; 6 7 const int maxn=1000+5; 8 9 int T,n,b,cnt; 10 11 map<string,int> id; 12 int ID(string s) 13 { 14 if(!id.count(s)) id[s]=cnt++; 15 return id[s]; 16 } 17 18 struct Component 19 { 20 int price; 21 int quality; 22 }; 23 vector<Component> comp[maxn]; 24 25 bool ok(int q) 26 { 27 int sum=0; 28 for(int i=0;i<cnt;i++) 29 { 30 int cheapest=b+1,m=comp[i].size(); 31 for(int j=0;j<m;j++) 32 if(comp[i][j].quality>=q) 33 cheapest=min(cheapest,comp[i][j].price); 34 if(cheapest==b+1) return false; 35 sum+=cheapest; 36 if(sum>b) return false; 37 } 38 return true; 39 } 40 41 int main() 42 { 43 cin>>T; 44 for(int k=1;k<=T;k++) 45 { 46 cin>>n>>b; 47 cnt=0; 48 for(int i=0;i<n;i++) comp[i].clear(); 49 id.clear(); 50 int maxq=0; 51 for(int i=0;i<n;i++) 52 { 53 string type,name; 54 int p,q; 55 cin>>type>>name>>p>>q; 56 maxq=max(maxq,q); 57 comp[ID(type)].push_back((Component){p,q}); 58 } 59 int L=0,R=maxq; 60 while(L<R) 61 { 62 int M=(L+R+1)/2; 63 if(ok(M)) L=M;else R=M-1; 64 } 65 cout<<L<<endl; 66 } 67 return 0; 68 }