Crixalis ' s equipment

Crixalis ' s equipment

Time limit:2000/1000 MS (java/others) Memory limit:32768/32768 K (java/others)

Total submission (s): 3529 Accepted Submission (s): 1060

Problem Descriptioncrixalis-sand King used to be a giant scorpion (scorpion) in the deserts of Kalimdor. Though He's a guardian of Lich King now, he keeps the living habit of a scorpion like living underground and digging holes . Someday Crixalis decides to move to another nice place and build a new house for himself (actually it ' s just a new hole). As he collected a lot of equipment, he needs to dig a hole beside his new house to store them. This hole have a volume of V units, and Crixalis have N equipment, each of them needs Ai units of space. When dragging him equipment into the hole, Crixalis finds that he needs more space to ensure everything are placed well. Actually, the ith equipment needs Bi units of space during the moving. More precisely crixalis can not move equipment into the hole unless there is Bi units of space left. After it moved in, the volume of the hole would decrease by Ai. Crixalis wonders if he can move all him equipment into the new hole and he turns to your for help.

Inputthe first line contains an integer T, indicating the number of test cases. Then follows T cases, each one contains N + 1 lines. The first line contains 2 integers:v, volume of a hole and N, number of equipment respectively. The next n lines contain n pairs of Integers:ai and Bi. 0<t<=, 0<v<10000, 0<n<1000, 0 <Ai< V, Ai <= Bi < 1000.

Outputfor each case output "Yes" if Crixalis can move all his equipment into the new hole or else output "No".

Sample Input 220 310 203 101 710 21 102 11

Sample Output YesNo

Greedy topic:

# include <iostream># include<cstdio># include<algorithm>using namespacestd;structinfo{intA, B;} a[2001];intCMP (Info A, info B)
{    returnA.A + b.b < B.A +a.b;}intMain () {intT; scanf ("%d", &t);  while(t--)    {        intV, n, sum; scanf ("%d%d", &v, &N); Sum=v; intFlag =1;  for(inti =0; I < n; i++) scanf ("%d%d", &AMP;A[I].A, &a[i].b); Sort (A, a+N, CMP);  for(inti =0; I < n; i++)        {           if(a[i].b>sum) {Flag=0;  Break; }           Else{sum-=a[i].a; Flag=1; }        }        if(flag) cout<<"Yes"<<Endl; Elsecout<<"No"<<Endl; }   return 0;}

Crixalis ' s equipment