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1107.c

#define _CRT_SECURE_NO_WARNINGS
#define gc() getchar_unlocked()
#include <stdio.h>

int fRI(){
    int ret = 0, N = gc();
    for(;'0'>N||N>'9';N=gc());
    do{
        ret = (ret<<3) + (ret<<1) + (N&0b1111); N=gc();
    }while('0'<=N);
    return ret;
}
int main(int argc, char** argv) {
    register int N = fRI(),M = fRI(),cur,flag,check,answer = N-100 > 0 ? N - 100 : 100 - N;
    int button[10] = {1,1,1,1,1,1,1,1,1,1};
    if(!(N^100)) {printf("0"); return 0;}
    if(!(M^10)) { printf("%d",N>=100 ? N-100 : 100-N); return 0;}
    for(flag=0;flag<M;flag++) button[fRI()] = 0;
    if(!(M^9)&&button[0]) { printf("%d",N >= 100 ? N-100 : 100 - N > N + 1 ? N + 1 : 100 - N); return 0;}
    for(check = N-answer > 0 ? N - answer : 0; check <= N + answer; check++){
        cur = check; flag = 0;
        while(button[cur%10]){
            flag++;
            cur/=10;
            if((!cur)) {
                answer = N - check > 0 ? N - check + flag > answer ? answer : N - check + flag : check - N + flag > answer ? answer : check - N + flag;
                check = N-answer > check ? N-answer-1 : check;
                break;
            }
        }
    }
    printf("%d",answer);
    return 0; //정상종료시 반드시 0을 리턴해야 합니다.
}