Compilare: main.cpp: In function 'void init()': main.cpp:18:33: warning: iteration 2 invokes undefined behavior [-Waggressive-loop-optimizations] for(int j=0;j<3;j++)ex[i][j]=0; ~~~~~~~~^~ main.cpp:18:18: note: within this loop for(int j=0;j<3;j++)ex[i][j]=0; ~^~ main.cpp:18:32: warning: array subscript is above array bounds [-Warray-bounds] for(int j=0;j<3;j++)ex[i][j]=0; ~~~~~~~^ main.cpp: In function 'int main()': main.cpp:18:32: warning: array subscript is above array bounds [-Warray-bounds] for(int j=0;j<3;j++)ex[i][j]=0; ~~~~~~~^ main.cpp:18:32: warning: array subscript is above array bounds [-Warray-bounds] for(int j=0;j<3;j++)ex[i][j]=0; ~~~~~~~^ main.cpp:18:32: warning: array subscript is above array bounds [-Warray-bounds] for(int j=0;j<3;j++)ex[i][j]=0; ~~~~~~~^