Compilare: main.cpp: In function 'int main()': main.cpp:39:30: warning: for increment expression has no effect [-Wunused-value] for (j=maxx+1; j--; j>=0) ~^~~ main.cpp:14:21: warning: unused variable 'k' [-Wunused-variable] int n, m, i, j, k, p, q, maxx; ^ main.cpp:14:30: warning: 'maxx' may be used uninitialized in this function [-Wmaybe-uninitialized] int n, m, i, j, k, p, q, maxx; ^~~~