USACO 2.1.3 Sorting A Three-Valued Sequence

ID: lorelei3

TASK: sort3

LANG: C++

#include <fstream>

#include <iostream>

#include <algorithm>

using namespace std;

const int MAX = 1005;

int first[MAX], second[MAX];

int n;

int main(){

int i,j, npairs=0, ntriples=0, nswap=0;

ifstream in("sort3.in");

ofstream out("sort3.out");

in>>n;

for(i=0; i<n; ++i){

in>>first[i];

second[i]=first[i];

}

sort(second, second+n);

for(i=0; i<n; ++i)

for(j=0; j<n; ++j)

if(first[i]!=second[i] && first[j]!=second[j]

&& first[i]==second[j] && second[i]==first[j]){

first[i] = second[i];

first[j] = second[j];

npairs++;

}

for(i=0; i<n; ++i)

if(first[i]!=second[i])

ntriples++;

nswap = npairs + ntriples/3 *2;

out<<nswap<<endl;

return 0;

}

posted on 2010-11-21 00:45 小阮阅读(114) 评论(0) 编辑收藏引用所属分类: USACO

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