Compilare: main.cpp: In function 'int main()': main.cpp:79:9: warning: statement has no effect [-Wunused-value] 79 | for(st;;st+=2) | ^~ main.cpp:82:9: warning: statement has no effect [-Wunused-value] 82 | for(x;;x-=2) | ^ main.cpp:89:9: warning: statement has no effect [-Wunused-value] 89 | for(dr;;dr+=2) | ^~ main.cpp:92:9: warning: statement has no effect [-Wunused-value] 92 | for(y;;y-=2) | ^