Compilare: user.cpp: In function ‘int main()’: user.cpp:19:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x<= (1<<(n-1)) && y<= (1<<(n-1))){ ^ user.cpp:19:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x<= (1<<(n-1)) && y<= (1<<(n-1))){ ^ user.cpp:30:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(x<= (1<<(n-1)) && y> (1<<(n-1))){ ^ user.cpp:30:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(x<= (1<<(n-1)) && y> (1<<(n-1))){ ^ user.cpp:43:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(x> (1<<(n-1)) && y<= (1<<(n-1))){ ^ user.cpp:43:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(x> (1<<(n-1)) && y<= (1<<(n-1))){ ^ user.cpp:56:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(x> (1<<(n-1)) && y> (1<<(n-1))){ ^ user.cpp:56:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(x> (1<<(n-1)) && y> (1<<(n-1))){ ^ user.cpp:8:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("z.in", "r", stdin); ^ user.cpp:9:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("z.out", "w", stdout); ^ user.cpp:11:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^ user.cpp:17:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x,&y); ^