Compilare: main.cpp: In function 'int main()': main.cpp:31:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pluton.in","r",stdin); ^ main.cpp:32:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pluton.out","w",stdout); ^ main.cpp:34:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:36:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i].n); ^ main.cpp:33:41: warning: 'istart' may be used uninitialized in this function [-Wmaybe-uninitialized] int n,i,cate,j,start,stop,max=-1,ap,istart; ^~~~~~ main.cpp:59:15: warning: 'ap' may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<ap<<'\n'; ^~~~