advent of code 2024 day 1 problem 2

Vicfred · Dec 5, 2024 · dc163fd · dc163fd
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diff --git a/aoc/aoc2024day01historianhysteria.d → aoc/aoc2024day01historianhysteria1.d b/aoc/aoc2024day01historianhysteria.d → aoc/aoc2024day01historianhysteria1.d
diff --git a/aoc/aoc2024day01historianhysteria2.d b/aoc/aoc2024day01historianhysteria2.d
@@ -0,0 +1,27 @@
+import std.algorithm;
+import std.stdio;
+
+long abs(long x) {
+  if(x < 0) {
+    return -x;
+  }
+  return x;
+}
+
+void main() {
+  long MAXN = 1000;
+  auto input = File("input.txt");
+  long[1000] u;
+  long[1000000] v;
+  long answer = 0;
+  for(long i = 0; i < MAXN; ++i) {
+    long x, y;
+    readf("%d %d\n", &x, &y);
+    u[i] = x;
+    v[y] += 1;
+  }
+  for(long i = 0; i < MAXN; ++i) {
+    answer += u[i]*v[u[i]];
+  }
+  answer.writeln;
+}