牛客小白月赛98

牛客/牛客小白月赛98/A.骰子魔术.md

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+骰子魔术
+
+https://ac.nowcoder.com/acm/contest/85598/A
+
+有一个一样的色子就可以
+
+```cpp
+// By SnowDream
+#include<bits/stdc++.h>
+using namespace std;
+typedef long long ll;
+const int N=1e6+10;
+
+int main()
+{
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+    int n,x;
+    cin >> n >> x;
+    int a;
+    bool ans= false;
+    for(int i=0;i<n;++i)
+    {
+        cin >> a;
+        if(a==x)
+        {
+            ans=true;
+        }
+    }
+    if(ans)
+        cout << "YES";
+    else
+        cout << "NO";
+    cout << "\n";
+    return 0;
+}
+```
+

牛客/牛客小白月赛98/B.最少剩几个？.md

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+最少剩几个？
+
+https://ac.nowcoder.com/acm/contest/85598/B
+
+计算奇偶数数量，先一奇一偶对消，再两奇对消
+
+```cpp
+// By SnowDream
+#include<bits/stdc++.h>
+using namespace std;
+typedef long long ll;
+const int N=1e6+10;
+int a[N];
+int main()
+{
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+    int n,s1=0,s2=0;
+    cin >> n;
+    for(int i=0;i<n;++i)
+    {
+        cin >> a[i];
+        if(a[i]%2==0)
+        {
+            s2++;
+        }
+        else
+        {
+            s1++;
+        }
+    }
+    if(s1==s2)
+    {
+        cout << 0;
+    }
+    else if(s1<s2)
+    {
+        cout << s2-s1;
+    }
+    else
+    {
+        int tmp=s1-s2;
+        if(tmp%2==0)
+            cout << 0;
+        else
+            cout << 1;
+    }
+    cout << "\n";
+    return 0;
+}
+```
+

牛客/牛客小白月赛98/C.两个函数.md

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+两个函数
+
+https://ac.nowcoder.com/acm/contest/85598/C
+
+数学方程化简
+
+```cpp
+// By SnowDream
+#include<bits/stdc++.h>
+using namespace std;
+typedef long long ll;
+const int N=1e6+10;
+ll a,x;
+ll fun()
+{
+    if(x==1)
+    {
+        return a%998244353;
+    }
+    ll tmp1 = a*a%998244353;
+    ll tmp2 = (x*(x-1))/2%998244353;
+    return tmp1*tmp2%998244353;
+}
+int main()
+{
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+    int t;
+    cin >> t;
+    while(t--)
+    {
+        cin >> a >> x;
+        cout << fun() << "\n";
+    }
+    return 0;
+}
+```
+