foo.cc: In function 'int main()':
foo.cc:14:9: error: 'i' was not declared in this scope
   14 |     for(i=1;i<=n;i++){
      |         ^
foo.cc:15:13: error: 'j' was not declared in this scope
   15 |         for(j=max(1,i-m+1);j<=i;j++){
      |             ^

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