/in/foo.cc: In function 'void inse(int, int, char, int)':
/in/foo.cc:139:3: error: expected primary-expression before '/' token
   /if(mat[st[x]][c-'a']==0)
   ^
/in/foo.cc:139:4: error: expected primary-expression before 'if'
   /if(mat[st[x]][c-'a']==0)
    ^~
/in/foo.cc:121:6: warning: unused variable 'i' [-Wunused-variable]
  int i,j,k,s,p,q,ie;
      ^
/in/foo.cc:121:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,k,s,p,q,ie;
        ^
/in/foo.cc:121:12: warning: unused variable 's' [-Wunused-variable]
  int i,j,k,s,p,q,ie;
            ^
/in/foo.cc:121:14: warning: unused variable 'p' [-Wunused-variable]
  int i,j,k,s,p,q,ie;
              ^
/in/foo.cc:121:16: warning: unused variable 'q' [-Wunused-variable]
  int i,j,k,s,p,q,ie;
                ^
/in/foo.cc:121:18: warning: unused variable 'ie' [-Wunused-variable]
  int i,j,k,s,p,q,ie;
                  ^~
/in/foo.cc: In function 'int query(int, int)':
/in/foo.cc:183:12: warning: unused variable 'i' [-Wunused-variable]
  int id,ii,i,j,k2,s,p,q,k,ret=0,ie,dv,ip,ix;
            ^
/in/foo.cc:183:14: warning: unused variable 'j' [-Wunused-variable]
  int id,ii,i,j,k2,s,p,q,k,ret=0,ie,dv,ip,ix;
              ^
/in/foo.cc:183:16: warning: unused variable 'k2' [-Wunused-variable]
  int id,ii,i,j,k2,s,p,q,k,ret=0,ie,dv,ip,ix;
                ^~
/in/foo.cc:183:19: warning: unused variable 's' [-Wunused-variable]
  int id,ii,i,j,k2,s,p,q,k,ret=0,ie,dv,ip,ix;
                   ^
/in/foo.cc:183:21: warning: unused variable 'p' [-Wunused-variable]
  int id,ii,i,j,k2,s,p,q,k,ret=0,ie,dv,ip,ix;
                     ^
/in/foo.cc:183:23: warning: unused variable 'q' [-Wunused-variable]
  int id,ii,i,j,k2,s,p,q,k,ret=0,ie,dv,ip,ix;
                       ^
/in/foo.cc:183:42: warning: unused variable 'ix' [-Wunused-variable]
  int id,ii,i,j,k2,s,p,q,k,ret=0,ie,dv,ip,ix;
                                          ^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:297:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,flag,x,c,ty,l,r;
        ^