codeforce 755 B

代码来自tourist，先码
http://codeforces.com/contest/755/problem/B

#include <bits/stdc++.h>

using namespace std;

const int N = 1234567;

string a[N];

char foo[N];

void get(string &s) 
{
    scanf("%s", foo);
    s = "";
    for (int j = 0; foo[j]; j++) 
        s += foo[j];
}

int main() 
{
    int n, m;
    scanf("%d %d", &n, &m);
    for (int i = 0; i < n + m; i++) 
    get(a[i]);

    sort(a, a + n + m);
    int common = 0;
    for (int i = 0; i < n + m - 1; i++) 
    {
        if (a[i] == a[i + 1]) 
        common++;
    }

    n -= common;
    m -= common;

    for (int it = 0; ; it++) 
    {
        if (it % 2 == 0) 
        {
            if (common > 0) 
                common--; 
            else if (n > 0)
                n--; 
            else 
            {
                puts("NO");
                break;
            }
            } 
        else 
        {
            if (common > 0) 
                common--; 
            else if (m > 0) 
                m--; 
            else 
            {
                puts("YES");
                break;
            }
        }
    }
    return 0;
}