Compilare: main.cpp: In function 'int main()': main.cpp:66:23: warning: iteration 2 invokes undefined behavior [-Waggressive-loop-optimizations] if(v[i]!=v[i+1]) ~~~~~^ main.cpp:65:18: note: within this loop for(int i=0;i<=2;i++) ~^~~ main.cpp:63:8: warning: array subscript is above array bounds [-Warray-bounds] v[3]=a[i][j+1]; ~~~^