foo.cc: In function 'int main()':
foo.cc:44:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   44 |     for(int i=tmp+1;i<n;i++)//前缀和，绝对操作次数
      |     ^~~
foo.cc:47:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   47 |         long long ans=0;
      |         ^~~~
foo.cc: In function 'int caldiff(int, int)':
foo.cc:28:1: warning: control reaches end of non-void function [-Wreturn-type]
   28 | }
      | ^

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