foo.cc: In function 'int main()':
foo.cc:10:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 | scanf("%d%d%d%d",&m,&n,&cost,&L);
      | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:12:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   12 | for(int j=1;j<=m;j++) scanf("%d",&sum[i][j]),sum[i][j]+=sum[i][j-1];
      |                       ~~~~~^~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务