Compilare: main.cpp: In function 'bool valid(int, int)': main.cpp:17:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if( matrix[x][y] == true || x < 1 || x > n || y < 1 || y > n ) ^~ main.cpp:19:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' return true; ^~~~~~