Accepted
/in/foo.cc: In function 'int main()': /in/foo.cc:26:19: warning: iteration 16 invokes undefined behavior [-Waggressive-loop-optimizations] rup[i] = lup[i] = 1; ~~~~~~~^~~ /in/foo.cc:25:15: note: within this loop for(i =1; i <=2*N+1; i++) ~~^~~~~~~