Compilare: main.cpp: In function 'int main()': main.cpp:39:38: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] 39 | a[i][j][k] = NULL; | ^~~~ main.cpp:61:47: warning: NULL used in arithmetic [-Wpointer-arith] 61 | while(prim != NULL && a[n][n][n] == NULL) | ^~~~ main.cpp:68:45: warning: NULL used in arithmetic [-Wpointer-arith] 68 | if(a[zz][xx][yy] == NULL) | ^~~~ main.cpp:114:26: warning: iteration 2147483646 invokes undefined behavior [-Waggressive-loop-optimizations] 114 | i++; | ~^~ main.cpp:113:26: note: within this loop 113 | while(i!=0) | ~^~~