Compilare: main.cpp: In function 'int main()': main.cpp:59:30: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized] else if (b > 0 && mem[a][b - 1] == mem[a][b] - 1) ~~^~~ main.cpp:56:50: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized] else if (a < n - 1 && mem[a + 1][b] == mem[a][b] - 1) ~~~~~~~~^