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Long long ago, there is a gunner whose name is Jack. He likes to go hunting very much. One day he go to the grove. There are n birds and n trees. The i−thbird stands on the top of the i−th tree. The trees stand in straight line from left to the right. Every tree has its height. Jack stands on the left side of the left most tree. When Jack shots a bullet in height H to the right, the bird which stands in the tree with height H will falls. Jack will shot many times, he wants to know how many birds fall during each shot. a bullet can hit many birds, as long as they stand on the top of the tree with height of H.
There are multiple test cases (about 5), every case gives n,m in the first line, n indicates there are n trees and n birds, m means Jack will shot m times. In the second line, there are n numbers h[1],h[2],h[3],…,h[n] which describes the height of the trees. In the third line, there are m numbers q[1],q[2],q[3],…,q[m] which describes the height of the Jack’s shots. Please process to the end of file. [Technical Specification] 1≤n,m≤1000000(106) 1≤h[i],q[i]≤1000000000(109) All inputs are integers.
For each q[i], output an integer in a single line indicates the number of birds Jack shot down.
4 3 1 2 3 4 1 1 4
1 0 1
用map保存数量即可。
1 #pragma comment(linker, "/STACK:1024000000,1024000000") 2 #include<iostream> 3 #include<cstdio> 4 #include<cstring> 5 #include<cmath> 6 #include<math.h> 7 #include<algorithm> 8 #include<queue> 9 #include<set> 10 #include<bitset> 11 #include<map> 12 #include<vector> 13 #include<stdlib.h> 14 #include <stack> 15 using namespace std; 16 #define PI acos(-1.0) 17 #define max(a,b) (a) > (b) ? (a) : (b) 18 #define min(a,b) (a) < (b) ? (a) : (b) 19 #define ll long long 20 #define eps 1e-10 21 #define MOD 1000000007 22 #define N 1000000 23 #define inf 1e12 24 int n,m; 25 map<int,int>mp; 26 int main() 27 { 28 while(scanf("%d%d",&n,&m)==2){ 29 mp.clear(); 30 for(int i=0;i<n;i++){ 31 int x; 32 scanf("%d",&x); 33 mp[x]++; 34 } 35 for(int i=0;i<m;i++){ 36 int x; 37 scanf("%d",&x); 38 printf("%d\n",mp[x]); 39 mp[x]=0; 40 } 41 } 42 return 0; 43 }
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原文地址：http://www.cnblogs.com/UniqueColor/p/4992942.html
