Compilare: main.cpp: In function 'int main()': main.cpp:22:18: warning: unused variable 'a' [-Wunused-variable] char a='U',b='R'; ^ main.cpp:22:24: warning: unused variable 'b' [-Wunused-variable] char a='U',b='R'; ^ main.cpp:23:17: warning: unused variable 'nr1' [-Wunused-variable] int nr1=1,nr2=1; ^~~ main.cpp:23:23: warning: unused variable 'nr2' [-Wunused-variable] int nr1=1,nr2=1; ^~~ main.cpp:9:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cardinal.in","r",stdin); ^ main.cpp:10:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cardinal.out","w",stdout); ^ main.cpp:13:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ main.cpp:17:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^