Compilare: main.cpp: In function 'int Q(int, int)': main.cpp:33:8: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(i+s<=n) ^ main.cpp: In function 'int main()': main.cpp:42:93: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("aib.in","r",stdin),freopen("aib.out","w",stdout),fread(r,1,M,stdin),n=A(),m=A(); ^ main.cpp:42:93: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] main.cpp:42:93: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result]