{"problem":{"name":"Minor Change","description":{"content":"Given are strings $S$ and $T$. Consider changing $S$ to $T$ by repeating the operation below. Find the minimum number of operations required to do so. Operation: Choose one character of $S$ and replac","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc172_b"},"statements":[{"statement_type":"Markdown","content":"Given are strings $S$ and $T$. Consider changing $S$ to $T$ by repeating the operation below. Find the minimum number of operations required to do so.\nOperation: Choose one character of $S$ and replace it with a different character.\n\n## Constraints\n\n*   $S$ and $T$ have lengths between $1$ and $2\\times 10^5$ (inclusive).\n*   $S$ and $T$ consists of lowercase English letters.\n*   $S$ and $T$ have equal lengths.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$S$\n$T$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc172_b","tags":[],"sample_group":[["cupofcoffee\ncupofhottea","4\n\nWe can achieve the objective in four operations, such as the following:\n\n*   First, replace the sixth character `c` with `h`.\n*   Second, replace the eighth character `f` with `t`.\n*   Third, replace the ninth character `f` with `t`.\n*   Fourth, replace the eleventh character `e` with `a`."],["abcde\nbcdea","5"],["apple\napple","0\n\nNo operations may be needed to achieve the objective."]],"created_at":"2026-03-03 11:01:14"}}