PAT (Advanced Level) 1092. To Buy or Not to Buy (20)

#include<cstdio>
#include<cstring>

const int maxn=1e5+10;
char s1[maxn],s2[maxn];
int cnt[300];
int tot[300];

int main()
{
    scanf("%s",s1);
    scanf("%s",s2);
    
    memset(cnt,0,sizeof cnt);
    memset(tot,0,sizeof tot);

    for(int i=0;s1[i];i++) cnt[s1[i]]++;
    for(int i=0;s2[i];i++) tot[s2[i]]++;

    bool flag=1;
    int ans=0;

    for(int i=0;i<300;i++)
    {
        if(cnt[i]<tot[i]){
            flag=0;
            ans=ans+tot[i]-cnt[i];
        }
    }

    if(flag==0) printf("No %d\n",ans);
    else printf("Yes %d\n",strlen(s1)-strlen(s2));
    return 0;
}