Compilare: main.cpp: In function 'int main()': main.cpp:26:25: warning: for increment expression has no effect [-Wunused-value] 26 | for (int i=m; i>=1; i) { | ^ main.cpp:27:29: warning: for increment expression has no effect [-Wunused-value] 27 | for (int j=n; j>=1; j) { | ^