diff --git a/README.md b/README.md
index e4d7a6a..a6ead4a 100644
--- a/README.md
+++ b/README.md
@@ -1,40 +1,21 @@
-# judger-test-collection
+# Judger Test Collection
 
-## How to use test collection
+This repository is gaining problem test cases for OJ Lab.
 
-As of now, all executables need to be built prior to testing.
+## How to use test collection
 
-use GNU make:
+As of now, all executables need to be built prior to testing:
 
 ```bash
-mkdir -p {build,dist}
-cmake -B build --install-prefix $(pwd)/dist
+mkdir -p build dist
+# GNU make
+cmake -B build --install-prefix "$(pwd)/dist"
+# # Ninja
+# cmake -B build --install-prefix $(pwd)/dist -G Ninja .
 cmake --build build --parallel
 cmake --install build
 ```
 
-or use Ninja:
-
-```bash
-mkdir -p {build,dist}
-cmake -B build --install-prefix $(pwd)/dist -G Ninja .
-cmake --build build
-cmake --install build
-```
+Or you should try `./build.sh` to help you do this.
 
-Then you will get all test file on `dist/`
-
-## Trouble Shooting
-
-You might get errors like:
-`g++: error: unrecognized command line option ‘-std=gnu++20’; did you mean ‘-std=gnu++2a’?`
-While running the provided bash in this repository.
-
-For resolution run the following commands if you are using Ubuntu in Github Codespaces:
-
-``` sh
-sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
-sudo apt install -y g++-11
-# Alternate the priority of g++ version usage
-sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-11 100
-```
+Then you will get all test file on `dist/`.
diff --git a/build.sh b/build.sh
index c201f48..2b06756 100755
--- a/build.sh
+++ b/build.sh
@@ -1,6 +1,6 @@
 #!/bin/sh -e
 
-mkdir -p {build,dist}
-cmake -B build --install-prefix $(pwd)/dist
+mkdir -p build dist
+cmake -B build --install-prefix "$(pwd)/dist"
 cmake --build build --parallel
 cmake --install build
diff --git a/packages/icpc/hello_world/output_validators/interactor-a-plus-b b/packages/icpc/hello_world/output_validators/interactor-a-plus-b
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index c237a18..0000000
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diff --git a/packages/icpc/hello_world/output_validators/ncmp b/packages/icpc/hello_world/output_validators/ncmp
deleted file mode 100755
index 8711c86..0000000
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