Submission #1936730

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Source Code Expand

#include "bits/stdc++.h"

using namespace std;
using ll = long long;
using IP = pair<int, int>;

const ll INF = 1LL << 62;
const int dx[4] = { 1,0,-1,0 };
const int sy[4] = { 0,1,0,-1 };

#define atcoder (int)1e9+7
#define Endl endl
#define mp make_pair
#define all(v) v.begin(),v.end()
#define pb push_back
#define pr(x) cout << x << endl
#define chmax(x) x = max(x,y)
#define chmin(x) x = min(x,y)
#define rep(i,n) for(int i= 0;i<n;i++)

ll gcd(ll a, ll b) {//最大公約数
	if (a%b == 0)return b;
	else gcd(b, a%b);
}

ll lcm(ll a, ll b) {//最小公倍数
	return (a / gcd(a, b))*b;
}

int main(){

	int a, b;
	cin >> a >> b;
	if (a%b == 0)pr(0);
	else {
		pr(b - a%b);
	}
	
	//system("pause");
	return 0;
}

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