#include using namespace std; typedef signed long long ll; #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 FORR2(x,y,arr) for(auto& [x,y]:arr) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) template 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;} //------------------------------------------------------- int H,W,N,D; vector V[101010]; template class UF_pop { public: vector par,rank,cnt; vector> hist; UF_pop() {par=rank=vector(um,0); cnt=vector(um,1); for(int i=0;i uf; void solve() { int i,j,k,l,r,x,y; string s; cin>>H>>W>>N>>D; FOR(y,H) V[y].resize(W); int num=0; FOR(i,N) { cin>>y>>x; x--,y--; V[y][x]=1; for(int y2=y-D;y2<=y+D;y2++) if(y2>=0&&y2=0&&x21&&uf.count(y*W+x)>1) num--; uf(y2*W+x2,y*W+x); } } } } int mi=1<<20,ma=-1; FOR(y,H) FOR(x,W) if(V[y][x]==0) { int step=0; int cnum=num; for(int y2=y-D;y2<=y+D;y2++) if(y2>=0&&y2=0&&x21&&uf.count(y*W+x)>1) cnum--; step++; uf(y2*W+x2,y*W+x); } } } mi=min(mi,cnum); ma=max(ma,cnum); FOR(j,step) uf.pop(); } cout<