Negative days completion.

programs/abs/info.json

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+{
+  "language": "C",
+  "name": "演習課題 2",
+  "description": "整数値を読み込み、その絶対値を出力するプログラム。",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/abs.png"
+  },
+  "note": ""
+}