upload some new code

FZOI/数的计数 + 输出.cpp

@@ -0,0 +1,111 @@
+#include <bits/stdc++.h>
+#define int long long
+#define endl "\n"
+#define IMX LONG_LONG_MAX
+#define IMN LONG_LONG_MIN
+#define debug$ if (dev)
+using namespace std;
+
+/* toothless. #17 */
+
+const int N = 1e7 + 10;
+const int M = 2e3 + 5;
+const bool dev = false;
+
+string s;
+int len, last, pre, x, flag, cs;
+char ch;
+vector<string> lstr, rstr;
+
+bool iszf(char ch)
+{
+    return ch == '+' || ch == '-' || ch == '*' || ch == '/';
+}
+
+bool is_num(char s)
+{
+    return s >= '0' && s <= '9';
+}
+
+bool is_str(const std::string &s)
+{
+    char *endptr;
+    strtod(s.c_str(), &endptr);
+    return !(*endptr == '\0');
+}
+
+int renum(string s)
+{
+    string t = s.substr(0, s.size());
+    return stoi(t);
+}
+void print()
+{
+    int ll = lstr.size();
+    for (int i = 0; i < ll; i ++ )
+        cout << lstr[i] << ' ';
+    cout << endl ;
+    ll = rstr.size();
+    for (int i = 0; i < ll; i ++ )
+        cout << rstr[i] << ' ';
+    cout << endl ;
+}
+
+bool is_ch(char ch)
+{
+    return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z');
+}
+signed main()
+{
+    ch = ' ';
+    getline(cin, s);
+    len = s.size();
+    for (int i = 0; i < s.size(); i++)
+    {
+        if (!(is_num(s[i])) && !iszf(s[i]) && is_ch(s[i]))
+            ch = s[i];
+        if (s[i] == '=')
+        {
+            flag = 1;
+            lstr.push_back(s.substr(last, i - last));
+            last = i + 1;
+            pre = i;
+        }
+        if (iszf(s[i]))
+        {
+            string wxh = s.substr(last, i - last);
+            if (wxh.size() == 1 && is_str(wxh))
+            {
+                wxh.insert(0, "1");
+            }
+            if (!flag)
+                lstr.push_back(wxh);
+            else
+                rstr.push_back(wxh);
+            last = i;
+        }
+    }
+    string wty = s.substr(last, s.size() - last);
+    if (wty.size() == 1 && is_str(wty))
+        wty.insert(0, "1");
+    rstr.push_back(wty);
+    int l = lstr.size();
+    for (int i = 0; i < l; i ++ )
+    {
+        if (!is_str(lstr[i]))
+            cs += stod(lstr[i]);
+        else
+            x -= renum(lstr[i]);
+    }
+    l = rstr.size();
+    for (int i = 0; i < l; i ++ )
+    {
+        if (!is_str(rstr[i]))
+            cs -= stod(rstr[i]);
+        else
+            x += renum(rstr[i]);
+    }
+    double cnt = cs * 1.0 / (x == 0 ? 1 : x);
+    printf("%c=%.3lf", ch, cnt);
+    return 0;
+}