Compilare: main.cpp: In function 'int main()': main.cpp:9:19: warning: unused variable 'nr' [-Wunused-variable] int n,m,i,j,k,nr,horse; ^~ main.cpp:9:22: warning: unused variable 'horse' [-Wunused-variable] int n,m,i,j,k,nr,horse; ^~~~~ main.cpp:7:34: 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); ^ main.cpp:8:38: 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); ^ main.cpp:11:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ main.cpp:14:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("\n%c %c",&ch1,&ch2); ^