Initial commit

2015/puzzle-10-02.cc

@@ -0,0 +1,37 @@
+#include <cassert>
+#include <functional>
+#include <iostream>
+#include <map>
+#include <regex>
+#include <set>
+#include <string>
+#include <variant>
+
+std::string look_and_say(std::string const &s) {
+  std::string result;
+  for (std::string::size_type i = 0; i < s.length();) {
+    unsigned num = 0;
+    char c = s[i];
+    while (s[i] == c) {
+      ++i;
+      ++num;
+    }
+    result += std::to_string(num) + c;
+  }
+
+  return result;
+}
+
+int main(int argc, char **argv) {
+  for (std::string line; std::getline(std::cin, line);) {
+    std::cout << "Application 0, length = " << line.length() << ": " << line
+              << "\n";
+    for (int i = 1; i < 51; ++i) {
+      line = look_and_say(line);
+      std::cout << "Application " << i << ", length = " << line.length()
+                << "\n";
+    }
+    std::cout << "Length: " << line.length() << "\n";
+  }
+  return 0;
+}