代码

#include <iostream>

using namespace std;

int main()
{
	int n = -1;
	cin>>n;
	int a[3] = {0};
	int b[3] = {0};
	int awin[3] = {0};
	int bwin[3] = {0};
	for(int i=0; i<n; i++)
	{
		char astr = NULL;
		cin>>astr;
		char bstr = NULL;
		cin>>bstr;
		if(astr==bstr)
		{
			a[1]++;
			b[1]++;
		}
		else if((astr=='C' && bstr=='J') || (astr=='J' && bstr=='B') 
					|| (astr=='B' && bstr=='C'))
		{
			a[0]++;
			b[2]++;
			if(astr=='B'){
				awin[0]++;
			}
			else if(astr=='C'){
				awin[1]++;
			}
			else{
				awin[2]++;
			}
		}
		else
		{
			a[2]++;
			b[0]++;
			if(bstr=='B'){
				bwin[0]++;
			}
			else if(bstr=='C'){
				bwin[1]++;
			}
			else{
				bwin[2]++;
			}
		}
	}
	int maxA = -1;
		int maxApos = -1;
		int maxB = -1;
		int maxBpos = -1;
		for(int j=0; j<3; j++){
			if(awin[j]>maxA){
				maxA = awin[j];
				maxApos = j;
			}
			if(bwin[j]>maxB){
				maxB = bwin[j];
				maxBpos = j;
			}
		}
		cout<<a[0]<<" "<<a[1]<<" "<<a[2]<<endl;
		cout<<b[0]<<" "<<b[1]<<" "<<b[2]<<endl;
		if(maxApos==0){
			cout<<"B ";
		}
		else if(maxApos==1){
			cout<<"C ";
		}
		else{
			cout<<"J ";
		}
		if(maxBpos==0){
			cout<<"B";
		}
		else if(maxBpos==1){
			cout<<"C";
		}
		else{
			cout<<"J";
		}
	return 0;
}

注解

水题。
（1）用数组记录双方胜平负次数。
（2）用另外一个数组记录双方胜利的手势次数。

结果