Compilare: main.cpp: In function 'bool go_down_from_left(int)': main.cpp:129:45: warning: statement has no effect [-Wunused-value] finterval[(val - 1) % len_interval]; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^ main.cpp: In function 'int main()': main.cpp:149:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &n, &m, &k, &l); ^ main.cpp: In function 'int getint()': main.cpp:19:10: warning: 'ch' is used uninitialized in this function [-Wuninitialized] while (!(ch >= '0' && ch <= '9')) ^~~~~~~~~~~~~~~~~~~~~~~~~