#include using namespace std; typedef signed long long ll; #undef _P #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) //------------------------------------------------------- int N; ll K; map M; void solve() { int i,j,k,l,r,x,y; string s; cin>>N>>K; FOR(i,N) { cin>>x>>y; M[x]++; M[y+1]--; } vector> V; FORR(m,M) if(m.second) V.push_back(m); int cur=0; FOR(i,V.size()-1) { cur+=V[i].second; if(K<=(V[i+1].first-V[i].first)*cur) { cout<