Compilare: main.cpp: In function 'void BFS(int**, int**, int, int, int)': main.cpp:29:13: warning: statement has no effect [-Wunused-value] c[i][j] == black; ~~~~~~~~^~~~~~~~ main.cpp: In function 'int main()': main.cpp:71:22: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ main.cpp:86:23: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%c", &c); // newline ^ main.cpp:88:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%c", &c); ^