Compilare: main.cpp: In function 'int main()': main.cpp:27:78: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("deque.in","r",stdin),freopen("deque.out","w",stdout),n=A(),k=A(); ^ main.cpp:27:78: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] main.cpp: In function 'char N()': main.cpp:10:31: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(r,1,M,stdin),q=0; ^