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TangDou/LanQiaoBei/ZhongGaoJi/复习1.md

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+## 复习提纲
+
+![](https://dsideal.obs.cn-north-1.myhuaweicloud.com/HuangHai/BlogImages/202403061946897.png)
+
+以$A$为例，5进制理解为$5^0,5^1,5^2,5^3$
+$(1234)_5=1*4+3*5+2*25+1*125=194$
+$(302)_8=2*8^0+0*8^1+3*8^2=2*1+0*8+3*64=194$
+$(11000100)_2=(304)_8$ 与$(302)_8$不同，所以答案是$C$
+$(C2)_{16}=2*1+12*16=194$
+
+![](https://dsideal.obs.cn-north-1.myhuaweicloud.com/HuangHai/BlogImages/202403061959229.png)
+```cpp {.line-numbers}
+#include <bits/stdc++.h>
+using namespace std;
+
+bool check(int x) {
+    int sum = 0;
+    while (x) {
+        int a = x % 10;
+        x /= 10;
+        sum += a;
+    }
+    return sum % 2 == 0;
+}
+
+int main() {
+    int n, m;
+    cin >> n >> m;
+    for (int i = n; i <= m; i++)
+        if (check(i))
+            cout << i << endl;
+    return 0;
+}
+```
+![](https://dsideal.obs.cn-north-1.myhuaweicloud.com/HuangHai/BlogImages/202403062003538.png)
+
+```cpp {.line-numbers}
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+    string s;
+    cin >> s;
+
+    int m;
+    cin >> m;
+    m--;
+
+    while (m--) {
+        string t;
+        for (int i = 0; i < s.size(); i++) {
+            int c = 1;
+            while (i + 1 < s.size() && s[i + 1] == s[i]) {
+                c++;
+                i++;
+            }
+            t = t + to_string(c) + s[i];
+        }
+        s = t;
+    }
+    cout << s << endl;
+    return 0;
+}
+
+```
+
+![](https://dsideal.obs.cn-north-1.myhuaweicloud.com/HuangHai/BlogImages/202403062017538.png)
+```cpp {.line-numbers}
+#include <bits/stdc++.h>
+using namespace std;
+int k;
+string kill(string s) {
+    int p = s[s.size() - 1]; // 最后一位是默认值
+    for (int i = 0; i < s.size() - 1; i++)
+        if (s[i + 1] > s[i]) {
+            p = i;
+            break;
+        }
+    string res;
+    for (int i = 0; i < s.size(); i++)
+        if (i != p) res += s[i];
+    return res;
+}
+
+int main() {
+    string s;
+    cin >> s >> k;
+    for (int i = 1; i <= k; i++) s = kill(s);
+    cout << s << endl;
+    return 0;
+}
+```