foo.cc: In function 'int main()':
foo.cc:43:5: error: expected ';' before 'for'
     for(int i=1; i<=n;i ++)
     ^~~
foo.cc:43:18: error: 'i' was not declared in this scope
     for(int i=1; i<=n;i ++)
                  ^
foo.cc:44:21: error: 'j' was not declared in this scope
         for(int j=1;j<=m;j++)
                     ^

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