Index: aoc2024.c
==================================================================
--- aoc2024.c
+++ aoc2024.c
@@ -4,15 +4,27 @@
 #include <string.h>
 
 #include "aocutils.h"
 
 void aoc202403(char *data, [[maybe_unused]] size_t len) {
-    int sumproducts = 0, term[2];
+    int sumproducts = 0, sumproducts2 = 0, term[2];
     char *rest = data;
+    char *doleft = data;
+    char *dorite = strstr(data + 1, "do()");
+    char *dontleft = data;
+    char *dontrite = strstr(dontleft + 1, "don't()");
     for (;;) {
         char *mul = strstr(rest, "mul(");
         if (mul) {
+            while (dorite && (mul > dorite)) {
+                doleft = dorite;
+                dorite = strstr(dorite + 1, "do()");
+            }
+            while (dontrite && (mul > dontrite)) {
+                dontleft = dontrite;
+                dontrite = strstr(dontrite + 1, "don't()");
+            }
             rest = mul + 4;
             if (isdigit((unsigned char)rest[0])) {
                 char *err;
                 term[0] = (int)strtol(rest, &err, 10);
                 if (*err == ',') {
@@ -19,10 +31,11 @@
                     if (isdigit((unsigned char)err[1])) {
                         rest = err + 1;
                         term[1] = (int)strtol(rest, &err, 10);
                         if (*err == ')') {
                             sumproducts += term[0] * term[1];
+                            sumproducts2 += (doleft >= dontleft) * (term[0] * term[1]);
                             rest = err + 1;
                         }
                     }
                 }
             }
@@ -29,10 +42,11 @@
         } else {
             break;
         }
     }
     printf("The sum of the products is {%d}.\n", sumproducts);
+    printf("The sum of the products with conditionals is {%d}.\n", sumproducts2);
 }
 
 static int safereport(int *v, int nv) {
     int dir = 1;               // ascending
     if (v[0] > v[1]) dir = -1; // descending