abc 346 B

#include <iostream>

using namespace std;

int a, b;
char str[15] = "wbwbwwbwbwbw";
const int len = 12;

int main()
{
    cin >> a >> b;
    for (int i = 0; i < len; i ++)
    {
        int l = 0, r = 0;
        int k = i;
        while (l < a && r < b)
        {
            if (str[k] == 'w') l ++ ;
            else r ++ ;
            k = (k + 1) % len;
        }
        // 这里注意可能有多个缺少的琴键，用循环
        while (l < a)
        {
            if (str[k] == 'w') l ++ ;
            else break;
            k = (k + 1) % len;
        }

        while (r < b)
        {
            if (str[k] == 'b') r ++ ;
            else break;
            k = (k + 1) % len;
        }

        if (l == a && r == b)
        {
            printf("Yes\n");
            return 0;
        }
    }

    printf("No\n");
    return 0;
}

abc 345A

// if else 比较琐碎
#include <iostream>

using namespace std;

char c;
bool st;

int main()
{
    cin >> c;
    if (c != '<') 
    {
        cout << "No" << endl;

        return 0;
    }
    st = true;
    while (cin >> c)
    {
        if (!st)
        {
            cout << "No" << endl;

            return 0;
        }
        if (c != '=')
        {
            if (c == '>') st = false;
            else
            {
                cout << "No" << endl;
                return 0;
            }
        }
    }

    if (!st) cout << "Yes" << endl;
    else cout << "No" << endl;

    return 0 ;
}

abc 345B

// 知识点：有符号数默认向 0 取整
long long n;

int main()
{
    cin >> n;
    if (n > 0) cout << (n + 9) / 10 << endl;
    else cout << n / 10 << endl;
    return 0;
}