rev/arrayaddition

arrayaddition/Dockerfile

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+FROM --platform=linux/amd64 ubuntu:latest
+
+RUN apt-get update -y && apt-get install -y gcc && rm -rf /var/lib/apt/lists/*
+
+COPY main.c .
+RUN gcc -o arrayaddition main.c

arrayaddition/chall.yaml

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+name: Array Addition
+categories:
+  - rev
+value: 25
+flag: bcactf{w0W_cHa4aCt3R_aDD}
+
+description: |-
+  Someone asked how well I could add ASCII characters. Please help.
+hints:
+  - What values are ASCII characters stored in?
+  - Is it possible there's a relation between the character and its position?
+files:
+  - src: ./arrayaddition
+    container: builder
+authors:
+  - Joshua Peisach (ItzSwirlz)
+visible: true
+deploy:
+  builder:
+    build: .
+# TODO: deployment

arrayaddition/flag.txt

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+bcactf{w0W_cHa4aCt3R_aDD}

arrayaddition/main.c

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+// flag is this
+// bcactf{w0W_cHa4aCt3R_aDD}
+#include <stdio.h>
+
+char arr[30] = {'b', 'b', '_', '`', 'p', 'a', 'u', 'p', '(', 'N', 'U', 'X', '<', 'T', '&', 'R', '3', 'c', '!', '?', 'K', 'L', '.', '-', 'e'};
+int main() {
+    // this will show how the text was generated which you can find w/ strings
+    // for(int i = 0; i < 25; i++) {
+    //     printf("%c", arr[i] + i);
+    // }
+
+    // solution:
+    // the same as above but subtract i instead of add
+
+    printf("i hope you can add numbers");
+    return 0;
+}