foo.cc: In function 'int main()':
foo.cc:8:30: error: invalid operands of types 'const char [2]' and 'int' to binary 'operator<<'
  cout <<a+b<<" "<< b+a+b<" " <<a+b+b+a+b;
                          ~~~~^~~~~~~~~~~
foo.cc:8:39: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  cout <<a+b<<" "<< b+a+b<" " <<a+b+b+a+b;
                                ~~~~~~~^~

自豪的采用 HydroJudge 进行评测(github.com/hydro-dev/HydroJudge)

正在同步测试数据，请稍后