作业帮map_iter->second程序运行到if(map_iter->second > 0)是报map set iterator not dereferencable
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map_iter->second程序运行到if(map_iter->second > 0)是报map set iterator not dereferencable
map_iter->second
程序运行到if(map_iter->second > 0)是报map set iterator not dereferencable
map_iter->second程序运行到if(map_iter->second > 0)是报map set iterator not dereferencable
map::reverse_iterator map_iter = mapval.rbegin();
for(; map_iter != mapval.rend(); map_iter++)
iterator都是从begin()开始到end()结束,哪怕逆向也是一样