来到这里，十有八九是手动编译安装的ffmpeg，在跑视频流程序或命令时出现这个问题。跟这个报错：ffmpeg:errorwhileloadingsharedlibraries:libx264.so.164:cannotopensharedobjectfile:Nosuchfileordirectory的错误本质是一样的，都是由于ffmpeg时使用到了libx264，而在

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https://codeforces.com/contest/2004/problem/C总结：一开始看错题了，思维惯性的认为alice会拿前一半大的元素，bob会拿后一半大的元素。。其实不是，而是每个人都挑最大的拿voidsolve(){intn,k;cin>>n>>k;vector<int>a(n);for(auto&x:a){

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Links:https://pyimagesearch.com/2021/01/23/splitting-and-merging-channels-with-opencv/OpenCVOfficial:https://docs.opencv.org/3.4/d3/df2/tutorial_py_basic_ops.htmlSplittingandMergingImageChannelsSometimesyouwillneedtoworkseparatelyonth