Compilare: user.cpp: In function ‘void solve()’: user.cpp:151:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<vals.size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:178:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("treemis.in","r",stdin); ^ user.cpp:179:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("treemis.out","w",stdout); ^ user.cpp: In function ‘void citire()’: user.cpp:48:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:49:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=1;i<=n;i++) scanf("%d",&val[i]); ^ user.cpp:53:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^