提出 #43338094

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ソースコード 拡げる

// Problem: A - Nine
// Contest: AtCoder - Denso Create Programming Contest 2023 (AtCoder Beginner Contest 309)
// URL: https://atcoder.jp/contests/abc309/tasks/abc309_a
// Memory Limit: 1024 MB
// Time Limit: 2000 ms
// 
// Powered by CP Editor (https://cpeditor.org)

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define ALL(x) (x).begin(), (x).end()
const double PI = 4*atan(1);
template<typename T>
void chmax(T& a, T const b) { a = max(a, b); }
template<typename T>
void chmin(T& a, T const b) { a = min(a, b); }
const int INF = 0x3f3f3f3f;
const ll LINF = 0x3f3f3f3f3f3f3f3f;
const int MOD = 1e9+7;
const int MAX_N = 2e6+10;

int a, b;

void solve()
{
	a--, b--;
	if((a/3 == b/3) && b-a==1){
		cout<<"Yes\n";
	}else{
		cout<<"No\n";
	}
}

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr); cout.tie(nullptr);
	cin >> a >> b;
	solve();
	return 0;
}

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