foo.cc: In function 'int main()':
foo.cc:30:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   30 |         for(int l=2;l<=i;l++)//从左往右推 从左往右走的情况更新
      |         ^~~
foo.cc:32:13: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   32 |             f[i][1]=min(f[i][1],f[i][i]+a[i][1]);
      |             ^

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