PAT_A 1041. Be Unique (20)
2017-08-17 22:59
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PAT_A 1041. Be Unique (20)
时间限制 100 ms 内存限制 65536 kB Being unique is so important to people on Mars that even their lottery is designed in a unique way. The rule of winning is simple: one bets on a number chosen from [1, 104]. The first one who bets on a unique number wins. For example, if there are 7 people betting on 5 31 5 88 67 88 17, then the second one who bets on 31 wins. Input Specification: Each input file contains one test case. Each case contains a line which begins with a positive integer N (<=10^5) and then followed by N bets. The numbers are separated by a space. Output Specification: For each test case, print the winning number in a line. If there is no winner, print "None" instead. Sample Input 1: 7 5 31 5 88 67 88 17 Sample Output 1: 31 Sample Input 2: 5 888 666 666 888 888 Sample Output 2: None
分析:
这题要求,找出最先出现的那个数,且出现一次。时间限制100ms,数据最大10^5,写完程序,担心超时,好比t1039。索性没有太多要求,一次AC。
方法:利用stl的map+vector完成,map用来完成重复数据计算,vector用来标识数据次序。最后按vector先后顺序,查找第一个map中value=1的key,即是。
code:
#include<iostream> #include<cstdio> #include<map> #include<vector> using namespace std; map<int,int> people; vector<int> seq; int main() { freopen("in","r",stdin); int N,tmp; cin>>N; for(int i=0;i<N;i++) { cin>>tmp; if(people[tmp]==0) seq.push_back(tmp); people[tmp]++; } int i=0; int size=seq.size(); for(i=0;i<size;i++) { if(people[seq[i]]==1) { cout<<seq[i]<<endl; break; } } if(i==size) cout<<"None"<<endl; return 0; }
AC
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