Compilare: user.cpp: In function ‘int check(int, int, int)’: user.cpp:21:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<h[x].size();i++) ^ user.cpp:18:9: warning: unused variable ‘pp’ [-Wunused-variable] int pp,x,i,j; ^ user.cpp:18:16: warning: unused variable ‘j’ [-Wunused-variable] int pp,x,i,j; ^ user.cpp: In function ‘int main()’: user.cpp:29:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("oite.in","r",stdin); ^ user.cpp:30:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("oite.out","w",stdout); ^ user.cpp:31:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&l); ^ user.cpp:33:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^