POJ-1007

#include<iostream>
#include<string>
#include<map>
using namespace std;

int inversionCompute(string str){
	int inversionSum=0;
	char *cp=(char*)str.data();
	for(int i=0;i<str.length()-1;i++){
		for(int j=i;j<str.length()-1;j++){
			if(cp[i]>cp[j+1]){
				inversionSum++;
			}
		}
	}

	return inversionSum;
}

int main(int argc, char *argv[]){
	int rowSize, lineNum;
	cin>>rowSize>>lineNum;

	string dnaSequence;
	multimap<int,string> intMap;
	for(int i=0;i<lineNum;i++){
		cin>>dnaSequence;
		intMap.insert(make_pair(inversionCompute(dnaSequence),dnaSequence));
	}

	for(multimap<int, string>::iterator iter=intMap.begin();iter!=intMap.end();++iter){
		cout<<iter->second<<endl;
	}

	return 0;
}

POJ-1007

原文：http://blog.csdn.net/eddy_liu/article/details/46840727