Compilare: user.cpp: In function ‘int main()’: user.cpp:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<st.size();++i) ^ user.cpp:22:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x; ^ user.cpp:36:9: warning: unused variable ‘top’ [-Wunused-variable] int top=0; ^ user.cpp:19:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ksecv3.in","r",stdin); ^ user.cpp:20:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ksecv3.out","w",stdout); ^ user.cpp:24:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:27:53: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x),allsum+=x,sp[i] = sp[i-1] + x; ^