Compilare: user.cpp: In function ‘void afis()’: user.cpp:9:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) ^ user.cpp: In function ‘void bt(int, int)’: user.cpp:18:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==n) ^ user.cpp: In function ‘int main()’: user.cpp:55:32: warning: format ‘%lu’ expects argument of type ‘long unsigned int*’, but argument 3 has type ‘long long unsigned int*’ [-Wformat=] scanf("%d%lu%lu",&n,&st,&dr); ^ user.cpp:55:32: warning: format ‘%lu’ expects argument of type ‘long unsigned int*’, but argument 4 has type ‘long long unsigned int*’ [-Wformat=] user.cpp:50:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("summax.in","r",stdin); ^ user.cpp:51:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("summax.out","w",stdout); ^ user.cpp:53:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:55:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%lu%lu",&n,&st,&dr); ^ user.cpp:60:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[n-i+1][n-j+2]); ^