foo.cc: In function 'int main()':
foo.cc:23:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   23 |  for(int i=1; i<=n; i++)
      |  ^~~
foo.cc:49:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   49 |   cout<<"There are "<<s<<" ships.";//输出要规范哈
      |   ^~~~

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