Compilare: user.cpp: In function ‘int main()’: user.cpp:20:15: warning: unused variable ‘lit1’ [-Wunused-variable] int n,m,i,lit1,lit2,j,k,aux; ^ user.cpp:20:20: warning: unused variable ‘lit2’ [-Wunused-variable] int n,m,i,lit1,lit2,j,k,aux; ^ user.cpp:18:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nrcuv.in","r",stdin); ^ user.cpp:19:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nrcuv.out","w",stdout); ^ user.cpp:22:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%c",&n,&m,&l1); ^ user.cpp:25:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c %c\n",&l1,&l2); ^