20240129

2024-01-29 15:38:09 +08:00
parent 7390900ee6
commit bfcbb1996a
5 changed files with 1094 additions and 0 deletions
--- a/ACMOJ-2101.cpp
+++ b/ACMOJ-2101.cpp
@ -0,0 +1,48 @@
+#include <iostream>
+#include <iomanip>
+#include <string>
+#include <algorithm>
+using namespace std;
+int main() {
+  #ifdef local
+  freopen("pro.in", "r", stdin);
+  #endif // ifdef local
+  string s;
+  cin >> s;
+  int  A = 0, B = 0; // Ax+B=0
+  bool is_right_side = false;
+  char variable_name;
+  int  cur = 0, flg = 1;
+  for (int i = 0; i < s.size(); i++) {
+    if (('0' <= s[i]) && (s[i] <= '9')) {
+      cur = cur * 10 + s[i] - '0';
+    } else if (s[i] == '=') {
+      B            += cur * flg;
+      cur           = 0;
+      flg           = 1;
+      is_right_side = true;
+    } else if (('a' <= s[i]) && (s[i] <= 'z')) {
+      if (((i - 1 >= 0) && !(('0' <= s[i - 1]) && (s[i - 1] <= '9'))) ||
+          (i == 0)) cur = 1;
+      variable_name = s[i];
+      if (!is_right_side) A += cur * flg;
+      else A -= cur * flg;
+      cur = 0;
+      flg = 1;
+    } else {
+      if ((i - 1 >= 0) && ('0' <= s[i - 1]) && (s[i - 1] <= '9')) {
+        if (!is_right_side) B += cur * flg;
+        else B -= cur * flg;
+        cur = 0;
+        flg = 1;
+        if (s[i] == '-') flg = -1;
+      } else {
+        if (s[i] == '-') flg *= -1;
+      }
+    }
+  }
+  B -= cur * flg;
+  double res = -double(B) / A;
+  cout << variable_name << "=" << fixed << setprecision(3) << res << endl;
+  return 0;
+}