codeforces 844A Diversity
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水题
#include<cstdio>#include<iostream>#include<algorithm>#include<cstring>#include<string>#include<set>using namespace std;int main(){ set<int>ff; char s[1010]; int k; scanf("%s",s); scanf("%d",&k); int len=strlen(s); for(int i=0;i<len;i++) { ff.insert(s[i]); } if(len<k) printf("impossible\n"); else { int w=ff.size(); if(w>=k) printf("0\n"); else printf("%d\n",k-w); } return 0;}
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