Compilare: main.cpp: In function 'int nrbits(int, int, int)': main.cpp:8:9: warning: unused variable 'nr' [-Wunused-variable] int nr=0; ^~ main.cpp: In function 'int main()': main.cpp:68:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("xor.in","r",stdin); ^ main.cpp:69:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("xor.out","w",stdout); ^ main.cpp:71:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&t,&p); ^ main.cpp:77:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&l1,&c1,&l2,&c2); ^