foo.cc: In function 'int main()':
foo.cc:15:21: warning: 'ans' may be used uninitialized [-Wmaybe-uninitialized]
   15 |         if(m1==1)ans+=c-d1;
      |                  ~~~^~~~~~
foo.cc:8:31: note: 'ans' was declared here
    8 |         int y1,m1,d1,y2,m2,d2,ans;
      |                               ^~~

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