#include "bits/stdc++.h" using namespace std; typedef long long ll; typedef pair P; const int INF = (1<<30); const ll INFLL = (1ll<<60); const ll MOD = (ll)(1e9+7); #define l_ength size void mul_mod(ll& a, ll b){ a *= b; a %= MOD; } void add_mod(ll& a, ll b){ a = (a1){ delayed[2*i+1] = true; delayed[2*i+2] = true; segtree[2*i+1][1] = min(segtree[2*i+1][1],segtree[i][1]); segtree[2*i+2][1] = min(segtree[2*i+2][1],segtree[i][1]); } delayed[i] = false; } } void update(int a, int b, int v, int i=0, int l=0, int r=n){ eval(i,l,r); if(b<=l || r<=a){ return; } if(a<=l && r<=b){ segtree[i][1] = min(segtree[i][1],v); delayed[i] = true; eval(i,l,r); }else{ update(a,b,v,2*i+1,l,(l+r)/2); update(a,b,v,2*i+2,(l+r)/2,r); segtree[i][0] = min(segtree[2*i+1][0],segtree[2*i+2][0]); } } int query(int a, int b, int i=0, int l=0, int r=n){ int vl,vr; eval(i,l,r); if(b<=l || r<=a){ return m; } if(a<=l && r<=b){ return segtree[i][0]; }else{ vl = query(a,b,2*i+1,l,(l+r)/2); vr = query(a,b,2*i+2,(l+r)/2,r); return min(vl,vr); } } int main(void){ int i,l,r,y=0,k=0,c=0; cin >> n >> m; fill(segtree[0],segtree[816225],m); for(i=0; i> l >> r >> t[i]; update(l-1,r,i); } t[m] = '@'; for(i=0; i