Compilare: main.cpp: In function 'void solve(int, int)': main.cpp:54:8: warning: unused variable 'opt1' [-Wunused-variable] {int i,opt1,opt2,opt3,nod; ^~~~ main.cpp:54:13: warning: unused variable 'opt2' [-Wunused-variable] {int i,opt1,opt2,opt3,nod; ^~~~ main.cpp:54:18: warning: unused variable 'opt3' [-Wunused-variable] {int i,opt1,opt2,opt3,nod; ^~~~ main.cpp:54:23: warning: unused variable 'nod' [-Wunused-variable] {int i,opt1,opt2,opt3,nod; ^~~ main.cpp: In function 'int main()': main.cpp:107:43: warning: iteration 500003 invokes undefined behavior [-Waggressive-loop-optimizations] for (i = 2; i < 2 * nmax; i++) ptm[i] = ptm[i / 2] + 1; ~~~~~~~^~~~~~~~~~~~~~~~ main.cpp:107:19: note: within this loop for (i = 2; i < 2 * nmax; i++) ptm[i] = ptm[i / 2] + 1; ^