Submission #13732

#	Time	Username	Problem	Language	Result	Execution time	Memory
13732		gs14004	관대한 주인 (TOKI14_generous)	C++14	100 / 100	12 ms	1084 KiB

generous

#include <cstdio>

long long mul(long long a, long long b, long long m){
    long long ret = 0;
    while (b) {
        ret += a * (b & 1023);
        b >>= 10;
        a <<= 10;
        ret %= m;
        a %= m;
    }
    return ret;
}
long long pw(int a, int x, long long m){
    long long r = a, p = 10;
    while (x) {
        if(x&1) r = mul(r,p,m*10);
        p = mul(p,p,m*10);
        x >>= 1;
    }
    return r;
}

int main(){
    int a,b,s,e;
    scanf("%d %d %d %d",&a,&b,&s,&e);
    a %= b;
    long long t = pw(a,s,b);
    for (int i=s; i<=e; i++) {
        printf("%lld",t/b);
        t %= b;
        t *= 10;
    }
}

• Subtask 1: 15 / 15
• Subtask 2: 20 / 20
• Subtask 3: 30 / 30
• Subtask 4: 23 / 23
• Subtask 5: 12 / 12