1351 topcoder 吃点心
https://www.51nod.com/onlineJudge/questionCode.html#!problemId=1351
先按low从大到小贪心再high从小到大贪心
1 #pragma comment(linker, "/STACK:1024000000,1024000000") 2 #include <iostream> 3 #include <cstdio> 4 #include <cstring> 5 #include <sstream> 6 #include <string> 7 #include <algorithm> 8 #include <list> 9 #include <map> 10 #include <vector> 11 #include <queue> 12 #include <stack> 13 #include <cmath> 14 #include <cstdlib> 15 // #include <conio.h> 16 using namespace std; 17 #define clc(a,b) memset(a,b,sizeof(a)) 18 #define inf 0x3f3f3f3f 19 #define lson l,mid,rt<<1 20 #define rson mid+1,r,rt<<1|1 21 const int N=100010; 22 const int MOD = 1e9+7; 23 #define LL long long 24 double const pi = acos(-1); 25 void fre() { 26 freopen("in.txt","r",stdin); 27 } 28 // inline int r() { 29 // int x=0,f=1;char ch=getchar(); 30 // while(ch>'9'||ch<'0') {if(ch=='-') f=-1;ch=getchar();} 31 // while(ch>='0'&&ch<='9') { x=x*10+ch-'0';ch=getchar();}return x*f; 32 // } 33 struct node{ 34 int x,y; 35 }p[55]; 36 37 bool cmp1(const node &a,const node &b){ 38 return a.x>b.x; 39 } 40 41 bool cmp2(const node &a,const node &b){ 42 return a.y<b.y; 43 } 44 45 int main(){ 46 // fre(); 47 int T; 48 scanf("%d",&T); 49 while(T--){ 50 int n,c,x; 51 scanf("%d%d%d",&n,&c,&x); 52 for(int i=0;i<n;i++){ 53 scanf("%d%d",&p[i].x,&p[i].y); 54 } 55 sort(p,p+n,cmp1); 56 int sum=0,ans1=0; 57 for(int i=0;i<n;i++){ 58 if(sum<x) 59 ans1++,sum+=p[i].x; 60 else 61 break; 62 } 63 int ans2=n; 64 sort(p,p+n,cmp2); 65 for(int i=0;i<n;i++){ 66 if(c-p[i].y>=x){ 67 ans2--,c-=p[i].y; 68 } 69 else 70 break; 71 } 72 printf("%d\n",min(ans1,ans2)); 73 } 74 return 0; 75 }
