Compilare: main.cpp: In function 'int main()': main.cpp:13:20: warning: variable 'cnt' set but not used [-Wunused-but-set-variable] int n,m,i,j,nr,cnt=0,l1,l2,c,t,t1; ^~~ main.cpp:13:36: warning: variable 't1' set but not used [-Wunused-but-set-variable] int n,m,i,j,nr,cnt=0,l1,l2,c,t,t1; ^~ main.cpp:11:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("omogene.in","r",stdin); ^ main.cpp:12:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("omogene.out","w",stdout); ^ main.cpp:15:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:18:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&nr); ^