Runtime Error
/in/foo.cc: In function 'int main()': /in/foo.cc:19:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++){ ~^~~ /in/foo.cc:30:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++){ ~^~~ /in/foo.cc:28:6: warning: unused variable 'fir' [-Wunused-variable] int fir=1; ^~~