【PAT】A1063 Set Similarity
Given two sets of integers, the similarity of the sets is defined to be?N?c??/N?t??×100%, where?N?c???is the number of distinct common numbers shared by the two sets, and?N?t???is the total number of distinct numbers in the two sets. Your job is to calculate the similarity of any given pair of sets.
Input Specification:
Each input file contains one test case. Each case first gives a positive integer?N?(≤50) which is the total number of sets. Then?Nlines follow, each gives a set with a positive?M?(≤10?4??) and followed by?M?integers in the range [0,10?9??]. After the input of sets, a positive integer?K?(≤2000) is given, followed by?K?lines of queries. Each query gives a pair of set numbers (the sets are numbered from 1 to?N). All the numbers in a line are separated by a space.
Output Specification:
For each query, print in one line the similarity of the sets, in the percentage form accurate up to 1 decimal place.
Sample Input:
3 3 99 87 101 4 87 101 5 87 7 99 101 18 5 135 18 99 2 1 2 1 3Sample Output:
50.0% 33.3%解題思路:
代碼:?
#include <stdio.h> #include <set> using namespace std; set<int> st[55];int main(){int n,m,x,set1,set2,inquiry,same,count=0;scanf("%d",&n); //集合的數量n//輸入數據 for(int i=1;i<=n;i++){scanf("%d",&m); //集合中的數量mfor(int j=0;j<m;j++){scanf("%d",&x); //集合中的每一個數,賦值為xst[i].insert(x); //將數插入到第i個集合中 } }//整理數據scanf("%d",&inquiry); //需要查詢的次數for(int i=0;i<inquiry;i++){same=0;scanf("%d%d",&set1,&set2); //比較的集合編號int count=st[set2].size();for(set<int>::iterator it=st[set1].begin();it!=st[set1].end();it++){//從第一個集合中的每一個數,看是否有數和st[set2]中的數一致,一致就same++,不一致則count++if(st[set2].find(*it)!=st[set2].end()){//一開始弄錯的地方same++;//printf("%d\n",same);}else{count++;//printf("c%d\n",count);}}printf("%.1lf%%\n",(double)(same*100.0/count));}return 0; }?
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