Compilare: main.cpp: In function 'int main()': main.cpp:14:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("zoro.in","r",stdin); ^ main.cpp:15:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("zoro.out","w",stdout); ^ main.cpp:17:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:21:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a); ^ main.cpp:16:19: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] int n,m,first,last; ^~~~ main.cpp:31:21: warning: 'first' may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i=first-1;i>=last;i--){ ^