#include using namespace std; using ll = long long; constexpr ll D_MAX=1e14; int main(){ ios::sync_with_stdio(false); cin.tie(nullptr); int H,W,N; cin>>H>>W>>N; unordered_map>P; vector>Ps(N); for(int i=0;i>A>>B; P[B].push_back(A); Ps[i]={A,B}; } for(auto &[key,val]:P){ sort(val.begin(),val.end()); } vector idx(0,0); for(auto i:P){ idx.push_back(i.first); } sort(idx.begin(),idx.end()); // for(int i:idx)cout<=0;i--){ dist_now+=idx[i+1]-idx[i]; dist_R[i]=dist_now; dist_now=min(dist_now,P[idx[i]][0]-1); } for(int X=0;X0){ ans=min(ans,h-P[w][t-1]); } if(P.find(w-1)!=P.end()){ int s=lower_bound(P[w-1].begin(),P[w-1].end(),h)-P[w-1].begin(); if(s<(int)P[w-1].size()){ ans=min(ans,P[w-1][s]); } if(s-1>=0){ ans=min(ans,h); } } if(P.find(w+1)!=P.end()){ int s=lower_bound(P[w+1].begin(),P[w+1].end(),h)-P[w+1].begin(); if(s<(int)P[w+1].size()){ ans=min(ans,P[w+1][s]); } if(s-1>=0){ ans=min(ans,h); } } t=lower_bound(idx.begin(),idx.end(),w)-idx.begin(); ans=min(ans,dist_L[t]+h-1); ans=min(ans,dist_R[t]+h-1); cout<