foo.cc: In function 'int SetInter(int*, int*, int, int)':
foo.cc:25:12: warning: statement has no effect [-Wunused-value]
        n[j]=='l';
        ~~~~^~~~~
foo.cc:26:12: warning: statement has no effect [-Wunused-value]
        m[k]=='o';
        ~~~~^~~~~

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