Compilare: main.cpp: In function 'int main()': main.cpp:31:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(oc[ns]==ns) ~~~~~~^~~~ main.cpp:9:13: warning: unused variable 'j' [-Wunused-variable] int n,i,j,k,ns,nd; ^ main.cpp:9:15: warning: unused variable 'k' [-Wunused-variable] int n,i,j,k,ns,nd; ^ main.cpp:7:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("curcubeu.in","r",stdin); ^ main.cpp:8:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("curcubeu.out","w",stdout); ^ main.cpp:10:43: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&A[1],&B[1],&C[1]); ^