Compilare: main.cpp: In function 'int main()': main.cpp:62:24: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] nr=nr&(1<<s-1); ~^~ main.cpp:63:27: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] if(nr+k!=(1<<s-1)) c[i][j]=-1; ~^~ main.cpp:43:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("panda.in","r",stdin); ^ main.cpp:44:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("panda.out","w",stdout); ^