foo.cc: In function 'int main()':
foo.cc:18:9: error: expected ',' or ';' before 'if'
   18 |         if(N<=lcm)
      |         ^~
foo.cc:20:9: error: 'else' without a previous 'if'
   20 |         else
      |         ^~~~
foo.cc: In function 'void compute(int)':
foo.cc:38:31: error: 'P' was not declared in this scope
   38 |                         SA+=S[P[i]][P[j]];
      |                               ^

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