From 92eca2b3b8c1a7105e6882a3313cb5d1f3e70527 Mon Sep 17 00:00:00 2001
From: Maxime Vorwerk <maxime@4-werk.com>
Date: Mon, 4 Nov 2024 13:56:49 +0100
Subject: [PATCH] two-sum

---
 two-sum/flag     | Bin 0 -> 15880 bytes
 two-sum/flag.c   |  51 +++++++++++++++++++++++++++++++++++++++++++++++
 two-sum/flag.txt |   1 +
 3 files changed, 52 insertions(+)
 create mode 100755 two-sum/flag
 create mode 100644 two-sum/flag.c
 create mode 100644 two-sum/flag.txt

diff --git a/two-sum/flag b/two-sum/flag
new file mode 100755
index 0000000000000000000000000000000000000000..1202f4485e370ec6ae330c761379ac33637240c1
GIT binary patch
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diff --git a/two-sum/flag.c b/two-sum/flag.c
new file mode 100644
index 0000000..d077dd2
--- /dev/null
+++ b/two-sum/flag.c
@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+static int addIntOvf(int result, int a, int b) {
+    result = a + b;
+    if(a > 0 && b > 0 && result < 0)
+        return -1;
+    if(a < 0 && b < 0 && result > 0)
+        return -1;
+    return 0;
+}
+
+int main() {
+    int num1, num2, sum;
+    FILE *flag;
+    char c;
+
+    printf("n1 > n1 + n2 OR n2 > n1 + n2 \n");
+    fflush(stdout);
+    printf("What two positive numbers can make this possible: \n");
+    fflush(stdout);
+    
+    if (scanf("%d", &num1) && scanf("%d", &num2)) {
+        printf("You entered %d and %d\n", num1, num2);
+        fflush(stdout);
+        sum = num1 + num2;
+        if (addIntOvf(sum, num1, num2) == 0) {
+            printf("No overflow\n");
+            fflush(stdout);
+            exit(0);
+        } else if (addIntOvf(sum, num1, num2) == -1) {
+            printf("You have an integer overflow\n");
+            fflush(stdout);
+        }
+
+        if (num1 > 0 || num2 > 0) {
+            flag = fopen("flag.txt","r");
+            if(flag == NULL){
+                printf("flag not found: please run this on the server\n");
+                fflush(stdout);
+                exit(0);
+            }
+            char buf[60];
+            fgets(buf, 59, flag);
+            printf("YOUR FLAG IS: %s\n", buf);
+            fflush(stdout);
+            exit(0);
+        }
+    }
+    return 0;
+}
diff --git a/two-sum/flag.txt b/two-sum/flag.txt
new file mode 100644
index 0000000..0c832bb
--- /dev/null
+++ b/two-sum/flag.txt
@@ -0,0 +1 @@
+flag{test}