CF-373B

题意很简单，注意别爆内存。

#include<iostream>#include<cstdio>#include<cstring>typedef __int64 LL;using namespace std ;int main(){   LL w,m,k,n1,n;while(scanf("%I64d %I64d %I64d",&w,&m,&k)!=EOF){ n1=1; n=m; LL r=0,ans=0; while(n){n/=10;n1*=10;r++; } LL s,w1; for(;w>0;n1*=10){s=(n1-m);w1=w/s/k/r;              //防止超内存。if(w1>=1){ans+=s;m=n1;w-=s*k*r;r++;}else{ans+=w/(r*k);break;} } printf("%I64d\n",ans);    } return 0 ;}