Compilare: user.cpp: In function ‘int main()’: user.cpp:24:27: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘std::vector<std::pair<int, int> >::size_type {aka long unsigned int}’ [-Wformat=] printf("%d\n",sirag.size()); ^ user.cpp:34:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sirag.size();i++) ^ user.cpp:11:21: warning: unused variable ‘num’ [-Wunused-variable] int n,i,last=0,ok=0,num=0,x,k,start,cnt; ^ user.cpp:9:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pietre3.in","r",stdin); ^ user.cpp:10:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pietre3.out","w",stdout); ^ user.cpp:12:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:14:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x),v[x]=1,last=max(last,x); ^ user.cpp:15:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&k); ^ user.cpp:16:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1;i<=k;i++)scanf("%d",&x),f[x]++,f2[x]++; ^