Ballot Analyzing Device
题目连接：
http://codeforces.com/gym/100269/attachments
Description
Election committee of Flatland is preparing for presidential elections. To minimize human factor in ballot
counting they decided to develop an automated Ballot Analyzing Device (BAD).
There are n candidates running for president. The ballot contains one square field for each candidate.
The voter must mark exactly one of the fields. If no field is marked or there are two or more marked
fields, the ballot is invalid. Each voter puts his/her ballot to a special scanner in BAD. The scanner
analyzes marks on the ballot and creates a special voting string of n characters: ‘X’ for marked field and
‘.’ for unmarked one. Now voting strings must be analyzed to get the report. Your task is to develop a
report generator for BAD.
Given voting strings for all ballots, your program must print the voting report. Candidates in the report
must be arranged in order of decreasing number of votes. If two candidates have the same number of
votes, they must have the same order as in a voting ballot. For each candidate calculate his/her result
in percent (if the candidate received p votes, the result in percent is 100p/m). The last line of the report
must indicate the percentage of the invalid ballots.
Input
The first line contains two integers n and m — the number of candidates and the number of ballots
(2 ≤ n ≤ 10; 1 ≤ m ≤ 1000). The following n lines contain last names of candidates. Each name is a
string of at most 100 English letters. There is no candidate named “Invalid”.
Then m lines follow, each of them contains one voting string.
Output
Print n+ 1 lines. First print results for candidates in percent. For each candidate print his/her last name
followed by a space and then his/her result in percent and a percent sign ‘%’. The last line must specify
the percentage of invalid ballots: a word “Invalid” followed by a space, the percentage of invalid ballots
and a percent sign.
Round all numbers to exactly two digits after the decimal point. If the number is exactly in the middle
of two representable numbers, output the greater one (e.g. output “12.35” for 12.345).
Sample Input
4 7
Loudy
Apples
Dogman
Miller
.X..
X...
....
..X.
..XX
..X.
..X.
Sample Output
Dogman 42.86%
Loudy 14.29%
Apples 14.29%
Miller 0.00%
Invalid 28.57%
Hint
题意
有m个人给n个人投票，每个人最多给一个人投票，如果投了两个人或者没有投票的话，那么这张票就算无效
然后让你按照票数高低排序，如果票数相同，就按照一开始的顺序输出
题解：
模拟题，当然也是水题
代码
#include<bits/stdc++.h>
using namespace std;
const int maxn = 1050;
char s[maxn];
pair<int,pair<int,string> > p[maxn];
int main()
{
freopen("bad.in","r",stdin);
freopen("bad.out","w",stdout);
int n,m;
scanf("%d%d",&n,&m);
int t=0;
for(int i=0;i<n;i++)
cin>>p[i].second.second,p[i].second.first=n-i;
for(int i=0;i<m;i++)
{
scanf("%s",s);
int flag = 0,cnt = 0;
for(int j=0;j<n;j++)
{
if(s[j]=='X')
flag=j,cnt++;
}
if(cnt==0||cnt>1)
t++;
else
p[flag].first++;
}
sort(p,p+n);
for(int i=n-1;i>=0;i--)
{
cout<<p[i].second.second<<" ";
printf("%.2f%%\n",100.0*p[i].first/m);
}
printf("Invalid %.2f%%\n",100.0*t/m);
}