[String brute force] HDU 2847

Violence is not explained.

#include <vector>#include <list>#include <map>#include <set>#include <queue>#include <string>#include <deque>#include <stack>#include <algorithm>#include <iostream>#include <iomanip>#include <cstdio>#include <cmath>#include <cstdlib>#include <limits.h>#include <time.h>#include <string.h>using namespace std;int lowbit(int t){return t&(-t);}int countbit(int t){return (t==0)?0:(1+countbit(t&(t-1)));}int gcd(int a,int b){return (b==0)?a:gcd(b,a%b);}#define LL long long#define PI acos(-1.0)#define N  1010#define MAX INT_MAX#define MIN INT_MIN#define eps 1e-8#define FRE freopen("a.txt","r",stdin)int main(){    char s[30];    char ss[30];    int n;    while(scanf("%s%d",s,&n)!=EOF){        int i,j,k;        int cnt;        int len=strlen(s);        int sum=0;        for(i=0;i<len;i++)sum=sum*2+s[i]-'0';        if( sum % n == 0){printf("%s\n",s);continue;}        else k=( sum / n + 1 )*n;        while(1){            int cur=k;//            cnt=0;            while(cur){                ss[cnt++]=cur%2+'0';                cur>>=1;            }            //ss[cnt]='\0';            int l=0,r=cnt-1;            while(l<len && r>=0){                if(s[l]==ss[r]){                    l++;                    r--;                }                else                r--;            }            if(l>=len)break;            k+=n;        }        for(i=cnt-1;i>=0;i--)        printf("%c",ss[i]);        puts("");    }    return 0;}