Compilare: main.cpp: In function 'bool go_down_from_left(int)': main.cpp:114:45: warning: statement has no effect [-Wunused-value] finterval[(val - 1) % len_interval]; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^ main.cpp: In function 'int main()': main.cpp:128:42: 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:136:43: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &getpoint(j, i)); ^ main.cpp:141:43: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &getpoint(i, j)); ^