foo.cc: In function 'int main()':
foo.cc:8:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&d,&n);
     ~~~~~^~~~~~~~~~~~~~
foo.cc:9:60: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(register int i=1;i<=n;i++) scanf("%d%d%d",&x,&y,&z),maps[x+1][y+1]=z;
                                    ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~

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