#pragma GCC optimize("O3") #include using namespace std; using ll=long long; using P=pair; template using V=vector; #define fi first #define se second #define all(v) (v).begin(),(v).end() const ll inf=(1e18); //const ll mod=998244353; const ll mod=1000000007; ll GCD(ll a,ll b) {return b ? GCD(b,a%b):a;} ll LCM(ll c,ll d){return c/GCD(c,d)*d;} struct __INIT{__INIT(){cin.tie(0);ios::sync_with_stdio(false);cout< bool chmax(T &a, const T &b) { if (a bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; } class UF{ public: vector par,num; int find(int v){ return (par[v]==v)? v: (par[v]=find(par[v])); } explicit UF(int N):par(N),num(N,1){ iota(all(par),0); } void unite(int u,int v){ u=find(u),v=find(v); if(u==v)return; if(num[u]>n>>a>>b; UF uf(n); V d(n); V

seg; for(int i=0;i>d[i]; for(int i=0;i0){ uf.unite(i,l); seg.emplace_back(l,r-1); } } sort(all(seg)); V

res; ll L=-1,R=-1; for(int i=0;i