/in/foo.cc: In function 'int main()':
/in/foo.cc:158:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  158 |     for (int j = 1; j <= m; j++)
      |     ^~~
/in/foo.cc:160:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  160 |         ISAP();
      |         ^~~~
/in/foo.cc:142:10: warning: variable 'flag' set but not used [-Wunused-but-set-variable]
  142 |     bool flag;
      |          ^~~~