{"problem":{"name":"Write and Erase","description":{"content":"You are playing the following game with Joisino. *   Initially, you have a blank sheet of paper. *   Joisino announces a number. If that number is written on the sheet, erase the number from the shee","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc073_c"},"statements":[{"statement_type":"Markdown","content":"You are playing the following game with Joisino.\n\n*   Initially, you have a blank sheet of paper.\n*   Joisino announces a number. If that number is written on the sheet, erase the number from the sheet; if not, write the number on the sheet. This process is repeated $N$ times.\n*   Then, you are asked a question: How many numbers are written on the sheet now?\n\nThe numbers announced by Joisino are given as $A_1, ... ,A_N$ in the order she announces them. How many numbers will be written on the sheet at the end of the game?\n\n## Constraints\n\n*   $1≤N≤100000$\n*   $1≤A_i≤1000000000(=10^9)$\n*   All input values are integers.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$N$\n$A_1$\n$:$\n$A_N$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc073_c","tags":[],"sample_group":[["3\n6\n2\n6","1\n\nThe game proceeds as follows:\n\n*   $6$ is not written on the sheet, so write $6$.\n    \n*   $2$ is not written on the sheet, so write $2$.\n    \n*   $6$ is written on the sheet, so erase $6$.\n    \n\nThus, the sheet contains only $2$ in the end. The answer is $1$."],["4\n2\n5\n5\n2","0\n\nIt is possible that no number is written on the sheet in the end."],["6\n12\n22\n16\n22\n18\n12","2"]],"created_at":"2026-03-03 11:01:13"}}