Dev-C++开启对C++11的支持 做题的时候发现代码使用unordered_set后无法运行 并报错:dev c++提示[Error] #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.进行配置一下就好了