Add 22937.cpp

22xxx/22937.cpp

@@ -0,0 +1,26 @@
+#include <iostream>
+#include <string>
+using namespace std;
+
+void solve(void) {
+  string a, b; cin >> a >> b;
+
+  bool sign = (a[0] == '-') ^ (b[0] == '-');
+  a = (a[0] == '-') ? a.substr(1, 1) + a.substr(3) : a.substr(0, 1) + a.substr(2);
+  b = (b[0] == '-') ? b.substr(1, 1) + b.substr(3) : b.substr(0, 1) + b.substr(2);
+
+  string ans = to_string(stoull(a) * stoull(b));
+  while (ans.size() < 19) ans = "0" + ans;
+  ans.insert(ans.size() - 18, ".");
+  if (sign) ans = "-" + ans;
+  cout << ans << "\n";
+}
+
+int main(void) {
+  ios::sync_with_stdio(false);
+  cin.tie(nullptr); cout.tie(nullptr);
+
+  int n; cin >> n;
+  while (n--) solve();
+  return 0;
+}