foo.cc: In function 'int main()':
foo.cc:27:7: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   27 |       for (int j=a;j<=m;j++)
      |       ^~~
foo.cc:34:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   34 |  ans=-1e9;
      |  ^~~
foo.cc:11:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   11 |  scanf("%lld%lld%lld%lld",&n,&m,&a,&b);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:14:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   14 |    for (int j=1;j<=m;j++) scanf("%lld",&g[i][j]);
      |                           ~~~~~^~~~~~~~~~~~~~~~~

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