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View Code? Open in Web Editor NEW講談社『問題解決力を鍛える!アルゴリズムとデータ構造』の演習問題をPythonを使って解いたもの
講談社『問題解決力を鍛える!アルゴリズムとデータ構造』の演習問題をPythonを使って解いたもの
動的計画法を扱うときに
chmin(dp[i+1][j],dp[i][j])
みたいな感じでdp[i][j]
の方が小さかったらdp[i+1][j]を更新するみたいな記述が多い。
pythonではこのままでは
dp[i+1][j] =min(dp[i+1][j],dp[i][j])
と書くしかない
chminとchmaxを作ってsnipetに追加する.
def chmax(dp,i,j,x):
if x> dp[i][j]:
dp[i][j]=x
return True
return False
def chmin(dp,i,j,x):
if x<dp[i][j]:
dp[i][j]=x
return True
return False
intなどの型の変数は関数内で値を更新できない(コピーを渡しているため)のでdictやlist型を使う必要がある。
dp問題ではlistの中身を変更したいのでlistと比べる対象の値の他にdpの添字を引数にする。
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