foo.cc: In function 'int main()':
foo.cc:20:19: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long int*' [-Wformat=]
 scanf("%d%d",&n,&c);
              ~~   ^
foo.cc:20:19: warning: format '%d' expects argument of type 'int*', but argument 3 has type 'long int*' [-Wformat=]
foo.cc:21:41: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long int*' [-Wformat=]
 for (int i=1;i<n;i++) scanf("%d",&ans[i]);
                                  ~~~~~~~^
foo.cc:32:8: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
 if (i>c&&f!=ans[i]||f%i!=ans[i]) //优化三
     ~~~^~~~~~~~~~~
foo.cc:41:26: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long int' [-Wformat=]
 printf("%d %d %d\n",x,a,b);
                          ^
foo.cc:41:26: warning: format '%d' expects argument of type 'int', but argument 3 has type 'long int' [-Wformat=]
foo.cc:41:26: warning: format '%d' expects argument of type 'int', but argument 4 has type 'long int' [-Wformat=]
foo.cc:20:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d%d",&n,&c);
 ~~~~~^~~~~~~~~~~~~~
foo.cc:21:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 for (int i=1;i<n;i++) scanf("%d",&ans[i]);
                       ~~~~~^~~~~~~~~~~~~~

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