2021:01: Solve part 2 [cpp]

Author: kiriDevs

2021/day01/part2/solution.cpp

@@ -0,0 +1,46 @@
+#include <iostream>
+#include <fstream>
+
+using namespace std;
+
+const int windowSize = 3;
+int window[windowSize];
+
+void shiftWindow(int newValue) {
+  window[0] = window[1];
+  window[1] = window[2];
+  window[2] = newValue;
+}
+
+int windowTotal() {
+  int ret = 0;
+  for (int i = 0; i < windowSize; i++) ret += window[i];
+  return ret;
+}
+
+int main() {
+  ifstream inFile ("../input");
+  int inputNumbers[2000];
+
+  int curInNumber;
+  int curInLineInx = -1;
+  while (inFile >> curInNumber) {
+    curInLineInx += 1;
+    inputNumbers[curInLineInx] = curInNumber;
+  }
+
+  // Set the first window
+  for (int i = 0; i <= windowSize; i++) window[i] = inputNumbers[i];
+
+  int wentDeeperTimes = 0;
+  for (int i = 3; i < 2000; i++) {
+    int prev = windowTotal();
+    shiftWindow(inputNumbers[i]);
+    int cur = windowTotal();
+    if (cur > prev) wentDeeperTimes += 1;
+  }
+
+  cout << wentDeeperTimes << endl;
+}
+
+