foo.cc: In function ‘int main()’:
foo.cc:168:18: warning: left operand of comma operator has no effect [-Wunused-value]
  168 |         if(a)mi=(0,qpow(a,mod-2),0,1,mod-qpow(a,mod-2),0,0,mod-b*qpow(a,mod-2),1);
      |                  ^
foo.cc:168:36: warning: right operand of comma operator has no effect [-Wunused-value]
  168 |         if(a)mi=(0,qpow(a,mod-2),0,1,mod-qpow(a,mod-2),0,0,mod-b*qpow(a,mod-2),1);
      |                                    ^
foo.cc:168:54: warning: right operand of comma operator has no effect [-Wunused-value]
  168 |         if(a)mi=(0,qpow(a,mod-2),0,1,mod-qpow(a,mod-2),0,0,mod-b*qpow(a,mod-2),1);
      |                                                      ^
foo.cc:168:41: warning: value computed is not used [-Wunused-value]
  168 |         if(a)mi=(0,qpow(a,mod-2),0,1,mod-qpow(a,mod-2),0,0,mod-b*qpow(a,mod-2),1);
      |                                      ~~~^~~~~~~~~~~~~~
foo.cc:168:58: warning: right operand of comma operator has no effect [-Wunused-value]
  168 |         if(a)mi=(0,qpow(a,mod-2),0,1,mod-qpow(a,mod-2),0,0,mod-b*qpow(a,mod-2),1);
      |                                                          ^
foo.cc:168:78: warning: right operand of comma operator has no effect [-Wunused-value]
  168 |         if(a)mi=(0,qpow(a,mod-2),0,1,mod-qpow(a,mod-2),0,0,mod-b*qpow(a,mod-2),1);
      |                                                                              ^
foo.cc:168:63: warning: value computed is not used [-Wunused-value]
  168 |         if(a)mi=(0,qpow(a,mod-2),0,1,mod-qpow(a,mod-2),0,0,mod-b*qpow(a,mod-2),1);
      |                                                            ~~~^~~~~~~~~~~~~~~~
foo.cc:169:18: warning: left operand of comma operator has no effect [-Wunused-value]
  169 |         else mi=(0,0,0,1,1,0,0,mod-b,1);
      |                  ^
foo.cc:169:22: warning: right operand of comma operator has no effect [-Wunused-value]
  169 |         else mi=(0,0,0,1,1,0,0,mod-b,1);
      |                      ^
foo.cc:169:24: warning: right operand of comma operator has no effect [-Wunused-value]
  169 |         else mi=(0,0,0,1,1,0,0,mod-b,1);
      |                        ^
foo.cc:169:26: warning: right operand of comma operator has no effect [-Wunused-value]
  169 |         else mi=(0,0,0,1,1,0,0,mod-b,1);
      |                          ^
foo.cc:169:28: warning: right operand of comma operator has no effect [-Wunused-value]
  169 |         else mi=(0,0,0,1,1,0,0,mod-b,1);
      |                            ^
foo.cc:169:30: warning: right operand of comma operator has no effect [-Wunused-value]
  169 |         else mi=(0,0,0,1,1,0,0,mod-b,1);
      |                              ^
foo.cc:169:36: warning: right operand of comma operator has no effect [-Wunused-value]
  169 |         else mi=(0,0,0,1,1,0,0,mod-b,1);
      |                                    ^
foo.cc:169:35: warning: right operand of comma operator has no effect [-Wunused-value]
  169 |         else mi=(0,0,0,1,1,0,0,mod-b,1);
      |                                ~~~^~