#include "jumps.h" #include <bits/stdc++.h> using namespace std; const int nx=2e5+5, kx=18; int n, l[nx], r[nx], deg[nx], lvl[nx], p[kx][nx], pa[nx][kx], in[nx], out[nx], rt, t; vector<int> d[nx], g[nx], h; void dfs(int u, int p) { //cout<<"dfs "<<u<<'\n'; in[u]=++t; pa[u][0]=p; for (int i=1; i<kx; i++) pa[u][i]=pa[pa[u][i-1]][i-1]; for (auto v:g[u]) dfs(v, u); out[u]=t; } int lca(int u, int v) { if (lvl[u]>lvl[v]) swap(u, v); for (int i=kx-1; i>=0; i--) if (lvl[pa[v][i]]>=lvl[u]) v=pa[v][i]; if (u==v) return v; for (int i=kx-1; i>=0; i--) if (pa[u][i]!=pa[v][i]) u=pa[u][i], v=pa[v][i]; return pa[u][0]; } void init(int N, std::vector<int> H) { n=N; h=H; stack<int> s; for (int i=0; i<N; i++) l[i]=r[i]=N; for (int i=0; i<N; i++) { while (!s.empty()&&H[s.top()]<H[i]) s.pop(); if (!s.empty()) l[i]=s.top(), d[s.top()].push_back(i), deg[i]++; s.push(i); } while (!s.empty()) s.pop(); for (int i=N-1; i>=0; i--) { while (!s.empty()&&H[s.top()]<H[i]) s.pop(); if (!s.empty()) r[i]=s.top(), d[s.top()].push_back(i), deg[i]++; s.push(i); } queue<int> q; for (int i=0; i<N; i++) if (l[i]==N&&r[i]==N) q.push(i), rt=i; while (!q.empty()) { auto u=q.front(); q.pop(); for (auto x:d[u]) if (--deg[x]==0) q.push(x); lvl[u]=max(lvl[l[u]], lvl[r[u]])+1; } for (int i=0; i<N; i++) { if (lvl[l[i]]>lvl[r[i]]) g[l[i]].push_back(i); else g[r[i]].push_back(i); } for (int i=0; i<kx; i++) p[i][N]=N; for (int i=0; i<N; i++) p[0][i]=(lvl[l[i]]<lvl[r[i]])?l[i]:r[i]; for (int i=1; i<kx; i++) for (int j=0; j<N; j++) p[i][j]=p[i-1][p[i-1][j]]; dfs(rt, rt); } int minimum_jumps(int A, int B, int C, int D) { pair<int, int> mx; for (int i=A; i<=B; i++) mx=max(mx, {h[i], i}); int tmp=lca(A, B); if (tmp!=mx.second) cout<<1/0; vector<int> mn(n, 1e9); queue<int> q; for (int i=C; i<=D; i++) mn[i]=0, q.push(i); while (!q.empty()) { auto u=q.front(); q.pop(); for (auto v:d[u]) if (mn[v]>mn[u]+1) q.push(v), mn[v]=mn[u]+1; } int res=1e9; for (int i=A; i<=B; i++) res=min(res, mn[i]); if (res==1e9) return -1; return res; } /* 7 6 3 2 1 6 4 5 7 1 2 5 5 1 2 6 6 0 3 6 6 1 4 6 6 2 3 4 4 4 5 6 6 */

jumps.cpp: In function 'int minimum_jumps(int, int, int, int)':
jumps.cpp:72:32: warning: division by zero [-Wdiv-by-zero]
   72 |     if (tmp!=mx.second) cout<<1/0;
      |                               ~^~