Day 5 Question 2 (late)

Day5/Question2/inputTest

@@ -0,0 +1,11 @@
+3-5
+10-14
+16-20
+12-18
+
+1
+5
+8
+11
+17
+32

Day5/Question2/main.cpp

@@ -0,0 +1,70 @@
+#include <cstdint>
+#include <fstream>
+#include <iostream>
+#include <map>
+#include <string>
+
+typedef uint64_t inclusiveLowerBound;
+typedef uint64_t inclusiveUpperBound;
+
+int main() {
+  std::fstream input("input");
+  std::string currentLine = "";
+  std::multimap<inclusiveLowerBound, inclusiveUpperBound> ranges{};
+  uint16_t positionOfHypen = 0;
+  uint64_t upperBound = 0, lowerBound = 0;
+
+  // Range and values are seperated by an empty \n
+  while (std::getline(input, currentLine, '\n')) {
+    if (currentLine == "") {
+      break;
+    }
+
+    positionOfHypen = currentLine.find('-');
+    lowerBound = std::stoull(currentLine.substr(0, positionOfHypen));
+    upperBound = std::stoull(currentLine.substr(positionOfHypen + 1));
+
+    ranges.insert({lowerBound, upperBound});
+  }
+
+  // First time doing this with ranges
+  auto range = ranges.begin();
+  while (range != ranges.end()) {
+    auto secondRange = range;
+    secondRange++;
+
+    while (secondRange != ranges.end()) {
+      // 3 Possible cases
+
+      bool isEndOfFirstBiggerThanSecond = range->second >= secondRange->second;
+      // 1. Second range is fully inside First range
+      if (isEndOfFirstBiggerThanSecond) {
+        secondRange = ranges.erase(secondRange);
+        continue;
+      }
+
+      // 2. Second Range's end is bigger than first, but Second's start is
+      // smaller than first's end
+      if (!isEndOfFirstBiggerThanSecond &&
+          range->second >= secondRange->first) {
+        range->second = secondRange->second;
+        secondRange = ranges.erase(secondRange);
+        continue;
+      }
+
+      // 3. Nothing happens, they are not overlapping
+      secondRange++;
+
+      // Note: The begining of first range WILL ALWAYS be smaller than second
+    }
+    range++;
+  }
+
+  uint64_t password = 0;
+  for (auto keys : ranges) {
+    password += keys.second - keys.first + 1; // 1 is for range to be inclusive
+  }
+  std::cout << password << std::endl;
+
+  return 0;
+}