Compilare: main.cpp: In function 'int main()': main.cpp:57:35: warning: iteration 1 invokes undefined behavior [-Waggressive-loop-optimizations] l[i][j] += (d[i][k] * c[k][j])%MOD; ~~~~~~^ main.cpp:55:30: note: within this loop for(int k = 1; k <= 2; ++k) ~~^~~~ main.cpp:52:10: warning: array subscript is above array bounds [-Warray-bounds] d[1][2]=1; ~~~~~~^