Compilare: user.cpp: In function ‘int main()’: user.cpp:21:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( !Q.empty() && Q.size() > k ){ ^ user.cpp:13:12: warning: unused variable ‘m’ [-Wunused-variable] int n, m, i, j, x, y, k, adversar; ^ user.cpp:13:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, x, y, k, adversar; ^ user.cpp:13:24: warning: unused variable ‘y’ [-Wunused-variable] int n, m, i, j, x, y, k, adversar; ^ user.cpp:10:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bleach.in","r",stdin); ^ user.cpp:11:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bleach.out","w",stdout); ^ user.cpp:17:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:19:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^