prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -std=c++11 main.cpp -o main -O2
main.cpp: In function 'int main()':
main.cpp:50:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
         if (str.empty()) continue; ss.clear();
         ^~
main.cpp:50:36: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
         if (str.empty()) continue; ss.clear();
                                    ^~
finished

clean (3/3): 
finished

all task finished, build successfully