2025年，上证指数全年累计上涨18.41%，创最近6年来最大年度涨幅，创最近6年以来新高，上证指数最终报收3968.84点，深证成指全年上涨29.87%，创业板指全年上涨49.57%。北证50、科创综指年线分别上涨39.78%和46.30%。沪深300指数累计上涨17.66%。
4.8 402. 移掉 K 位数字。关于这个话题，下载安装汽水音乐提供了深入分析
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输入：num = "1432219", k = 3