foo.cc: In function 'int main()':
foo.cc:16:12: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
         if ((c[i]==')'||c[i]==']'||c[i]=='}')&&top)
            ^
foo.cc:9:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s",c);
     ~~~~~^~~~~~~~
foo.cc:8:28: warning: 'mx' may be used uninitialized in this function [-Wmaybe-uninitialized]
     int i,j,maxn=0,s=0,x=0,mx,l;
                            ^~

正在同步测试数据，请稍后
自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。