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codeforces #413 B T-shirt buying (贪心)

·2 mins
Note: This article is available in Chinese only. 本文暂无英文版本。 View original

题目链接

题意:有n个T恤,每个价格都不同,有三种颜色,分别用1,2,3表示,每件T恤给出前xiong和后背的颜色。现在有m个顾客排成一队,对于每个顾客,给出他喜欢的颜色,只要一个T恤的前xiong或者后背的颜色之一满足该颜色即可。顾客总希望买符合他喜欢颜色的T恤中价格最低的。现在问每个顾客买到的T恤的价格,如果某个顾客没有买T恤,输出-1

思路:贪一下?

对于每个颜色,找到价格最低的。记录的时候顺便记录id,以标记某件有2个颜色的衣服是否卖出去了。

1A美滋滋

  1/* ***********************************************
  2Author :111qqz
  3Created Time :2017年05月11日 星期四 15时29分58秒
  4File Name :B.cpp
  5************************************************ */
  6
  7#include <cstdio>
  8#include <cstring>
  9#include <iostream>
 10#include <algorithm>
 11#include <vector>
 12#include <queue>
 13#include <set>
 14#include <map>
 15#include <string>
 16#include <cmath>
 17#include <cstdlib>
 18#include <ctime>
 19#define PB push_back
 20#define fst first
 21#define sec second
 22#define lson l,m,rt<<1
 23#define rson m+1,r,rt<<1|1
 24#define ms(a,x) memset(a,x,sizeof(a))
 25typedef long long LL;
 26#define pi pair < int ,int >
 27#define MP make_pair
 28
 29using namespace std;
 30const double eps = 1E-8;
 31const int dx4[4]={1,0,0,-1};
 32const int dy4[4]={0,-1,1,0};
 33const int inf = 0x3f3f3f3f;
 34const int N=2E5+7;
 35int n,m;
 36bool vis[N]; //表示某个id的是否被卖出。
 37vector< pair<int,int>>v[4]; //pair<price,id>,id是为了标记是否卖出去了,卖出去就继续找下一个。
 38				    //虽然价格本身唯一,但是太大不适合做标记?
 39struct node
 40{
 41    int p,a,b;
 42    int id;
 43}A[N];
 44
 45bool cmp(node x,node y)
 46{
 47    return x.p<y.p;
 48}
 49vector<int>ans;
 50int main()
 51{
 52	#ifndef  ONLINE_JUDGE
 53	freopen("code/in.txt","r",stdin);
 54  #endif
 55	ms(vis,false);
 56	scanf("%d",&n);
 57	for ( int i = 1 ; i <= n ; i++) scanf("%d",&A[i].p);
 58	for ( int i = 1 ; i <= n ; i++) scanf("%d",&A[i].a);
 59	for ( int i = 1 ; i <= n ; i++) scanf("%d",&A[i].b);
 60	for ( int i = 1 ; i <= n ; i++) A[i].id = i;
 61	//sort(A+1,A+n+1,cmp); //价格升序 没有必要吧。。。
 62
 63	for ( int i = 1 ; i <= n ; i++)
 64	{
 65	    int a = A[i].a;
 66	    int b = A[i].b;
 67	    int p = A[i].p;
 68	    int id = A[i].id;
 69	    if (a==b)
 70	    {
 71		v[a].push_back(make_pair(p,id));
 72	    }else
 73	    {
 74		v[a].push_back(make_pair(p,id));
 75		v[b].push_back(make_pair(p,id));
 76	    }
 77	}
 78
 79
 80
 81	sort(v[1].begin(),v[1].end());
 82	sort(v[2].begin(),v[2].end());
 83	sort(v[3].begin(),v[3].end());
 84	scanf("%d",&m);
 85	//cout<<"m:"<<m<<endl;
 86	int p[4]={0};
 87	int mm = m;
 88	while (m--)
 89	{
 90	    int x;
 91	    scanf("%d",&x);
 92	    while (p[x]<v[x].size()&&vis[v[x][p[x]].second]) p[x]++;
 93	    if (p[x]==v[x].size())
 94	    {
 95		ans.push_back(-1);
 96	    }
 97	    else
 98	    if (!vis[v[x][p[x]].second])
 99	    {
100		vis[v[x][p[x]].second] = true;
101		ans.push_back(v[x][p[x]].first);
102	    }
103	}
104	m = mm;
105	for ( int i = 0 ; i < m ; i++)
106	    printf("%d%c",ans[i],i==m-1?'\n':' ');
107
108
109
110  #ifndef ONLINE_JUDGE
111  fclose(stdin);
112  #endif
113    return 0;
114}

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whust 2016 #1 D Zhenya moves from the dormitory (贪心,模拟)

·1 min
题目链接 傻逼模拟。。读完题就ac了。。。 1/* *********************************************** 2Author :111qqz 3Created Time :2016年08月07日 星期日 18时04分18秒 4File Name :code/whust2016/#1/D.cpp 5************************************************ */ 6#include <cstdio> 7#include <cstring> 8#include <iostream> 9#include <algorithm> 10#include <vector> 11#include <queue> 12#include <stack> 13#include <set> 14#include <map> 15#include <string> 16#include <cmath> 17#include <cstdlib> 18#include <deque> 19#include <ctime> 20#define fst first 21#define sec second 22#define lson l,m,rt<<1 23#define rson m+1,r,rt<<1|1 24#define ms(a,x) memset(a,x,sizeof(a)) 25typedef long long LL; 26#define pi pair < int ,int > 27#define MP make_pair 28using namespace std; 29const double eps = 1E-8; 30const int dx4[4]={1,0,0,-1}; 31const int dy4[4]={0,-1,1,0}; 32const int inf = 0x3f3f3f3f; 33const int N=280; 34int n,m; 35int total,adva,advb; 36struct Friend 37{ 38 int money; 39 int adv; 40}f[N]; 41struct Room 42{ 43 int type; 44 int cost; 45 int adv; 46}r[N]; 47struct Ans 48{ 49 int val; 50 int rid; 51 int fid; 52 bool operator < (Ans b)const 53 { 54 return val>b.val; 55 } 56}ans[300*300]; 57int main() 58{ 59 #ifndef ONLINE_JUDGE 60 freopen("code/in.txt","r",stdin); 61 #endif 62 cin>>total>>adva>>advb; 63 cin>>n; 64 for ( int i = 1 ; i <= n ; i++) 65 scanf("%d %d",&f[i].money,&f[i].adv); 66 scanf("%d",&m); 67 for ( int i = 1 ; i <= m ; i++) 68 scanf("%d%d%d",&r[i].type,&r[i].cost,&r[i].adv); 69 int cnt = 0 ; 70 for ( int i = 1 ; i <= m ; i++) 71 { 72 if (r[i].type==1) 73 { 74 if (r[i].cost<=total) 75 { 76 cnt++; 77 ans[cnt].val = r[i].adv+adva; 78 ans[cnt].rid = i; 79 ans[cnt].fid = -1; 80 } 81 continue; 82 } 83 else 84 { 85 for ( int j = 0 ; j <= n ; j++) 86 { 87 if (j==0) //自己住双人间 88 { 89 if (r[i].cost<=total) 90 { 91 cnt++; 92 ans[cnt].val = r[i].adv+advb; 93 ans[cnt].rid = i ; 94 ans[cnt].fid = -1; 95 } 96 } 97 else 98 { 99 if (r[i].cost<=total*2&&r[i].cost<=f[j].money*2) 100 { 101 cnt++; 102 ans[cnt].val = r[i].adv+f[j].adv; 103 ans[cnt].rid = i ; 104 ans[cnt].fid = j; 105 } 106 } 107 } 108 } 109 } 110// for ( int i = 1 ; i <= cnt ; i++) 111// { 112// printf("val:%d room: %d friend : %d \n",ans[i].val,ans[i].rid,ans[i].fid); 113// } 114 if (cnt==0) 115 { 116 puts("Forget about apartments. Live in the dormitory."); 117 }else 118 { 119 sort(ans+1,ans+cnt+1); 120 if (r[ans[1].rid].type==1) 121 { 122 printf("You should rent the apartment #%d alone.\n",ans[1].rid); 123 } 124 else 125 { 126 if (ans[1].fid==-1) 127 { 128 printf("You should rent the apartment #%d alone.\n",ans[1].rid); 129 } 130 else 131 { 132 133 printf("You should rent the apartment #%d with the friend #%d.\n",ans[1].rid,ans[1].fid); 134 135 } 136 } 137 } 138 #ifndef ONLINE_JUDGE 139 fclose(stdin); 140 #endif 141 return 0; 142}