Compilare: user.cpp: In function ‘int main()’: user.cpp:26:2: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for (i=2; i<=2000000; i++) ^~~ user.cpp:32:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ fout<<y*y; ^~~~ user.cpp:27:9: warning: iteration 1999998 invokes undefined behavior [-Waggressive-loop-optimizations] if(a[i]==1 && nr<var) ~~~^ user.cpp:26:13: note: within this loop for (i=2; i<=2000000; i++) ~^~~~~~~~~ user.cpp:14:7: warning: iteration 1999999 invokes undefined behavior [-Waggressive-loop-optimizations] a[i]=1; ~~~~^~ user.cpp:13:13: note: within this loop for (i=1; i<=2000000; i++) ~^~~~~~~~~ user.cpp:32:11: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<y*y; ^