This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
#define f first
#define se second
#define pb push_back
using namespace std;
long long size=0;
set<pair<long long, pair<long long,long long> > > t;
long long nsize=0;
long long n,m;
long long fix[1012*1012];
vector<long long> adj[1012*1012];
long long r[1010*1010];
long long a[1010*1012];
void dfs(long long p){
long long x=p/m,y=p%m;
fix[(x)*m+y]=1;
nsize++;
if(fix[(x-1)*m+(y)]!=1){
size++;
}
if(fix[(x+1)*m+(y)]!=1){
size++;
}
if(fix[(x)*m+(y+1)]!=1){
size++;
}
if(fix[(x)*m+(y-1)]!=1){
size++;
}
t.insert({a[(x+1)*m+(y)],{x+1,y}});
t.insert({a[(x)*m+(y-1)],{x,y-1}});
t.insert({a[(x)*m+(y+1)],{x,y+1}});
t.insert({a[(x-1)*m+(y)], {x-1,y}});
fix[(x-1)*m+(y)]=1;
fix[(x+1)*m+(y)]=1;
fix[(x)*m+(y-1)]=1;
fix[(x)*m+(y+1)]=1;
for(long long i=0; i<adj[p].size(); i++){
if(fix[adj[p][i]]==1){
continue;
}
dfs(adj[p][i]);
}
}
void dfs2(int p){
int x=p/m; int y=p%m;
if(r[x*m+y]==0){
return;
}
long long bruh=4;
bool left=true,right=true,up=true,down=true;
if(x+1>=n){
bruh--;
up=false;
}else if(fix[(x+1)*m+y]==1 || r[(x+1)*m+y]==1){
bruh--;
up=false;
}
if(x-1<0){
bruh--;
down=false;
}else if(fix[(x-1)*m+y] || r[(x-1)*m+y]==1){
bruh--;
down=false;
}
if(y-1<0){
bruh--;
left=false;
}else if(fix[(x)*m+y-1]==1 || r[(x)*m+y-1]==1){
bruh--;
left=false;
}
if( y+1>=m){
bruh--;
right=false;
}else if(fix[(x)*m+y+1]==1 || r[(x)*m+y+1]==1){
bruh--;
right=false;
}
if(bruh==3){
fix[(x)*m+y]=1;
if(up==true){
fix[(x+1)*m+y]=1;
}
if(down==true){
fix[(x-1)*m+y]=1;
}
if(left==true){
fix[(x)*m+y-1]=1;
}
if(right==true){
fix[(x)*m+y+1]=1;
}
if(up==true){ if(x+2<n){
dfs2((x+2)*m+y);
}
}
if(right==true){
if(y+2<=m){
dfs2((x)*m+y+2);
}
}
if(left==true){
if(y-2>=0){
dfs2((x)*m+y-2);
}
}
if(down==true){
if(x-2>=0){
dfs2((x-2)*m+y);
}
}
}
/*
if(bruh<3){
cout<<"No"<<endl;
return 0;
}*/
}
int main(){
cin>>n>>m;
for(long long i=0; i<n; i++){
for (long long j=0; j<m; j++){
cin>>a[i*m+j];
r[(i)*m+j]=0;
fix[i*m+j]=0;
}
}
long long k;
cin>>k;
pair<long long,long long> c[k];
for(long long i=0; i<k; i++){
cin>>c[i].f>>c[i].se;
r[c[i].f*m+c[i].se]=1;
}
long long pas=0;
pair<long long,long long> d[8]={{1,1}, {1,0}, {1,-1}, {0,1}, {0, -1}, {-1,1}, {-1, 0}, {-1,-1}};
for(long long i=0; i<n; i++){
for(long long j=0; j<m; j++){
long long p=0;
for(long long ii=0; ii<8; ii++){
long long x=i+d[ii].f;
long long y=j+d[ii].se;
if( x>=n || x<0 || y<0 || y>=m){
continue;
}
if(r[(i)*m+j]==1 && r[(x)*m+y]==1){
p++;
if(i+1>=n || i-1<0 || j-1<0 || j+1>=m || x+1>=n || x-1<0 || y-1<0 || y+1>=m){
cout<<"No"<<endl;
return 0;
}
fix[(i)*m+j]=1;
fix[(i+1)*m+j]=1;
fix [(i-1)*m+j]=1;
fix[(i)*m+j-1]=1;
fix[(i)*m+j+1]=1;
fix[(x)*m+y]=1;
fix[(x+1)*m+y]=1;
fix[(x-1)*m+y]=1;
fix[(x)*m+y-1]=1;
fix[(x)*m+y+1]=1;
}
}
if(p>1){
cout<<"No"<<endl;
return 0;
}
}
}
for(long long i=0; i<k; i++){
long long x=c[i].f,y=c[i].se;
if(fix[(x)*m+y]==1){
continue;
}
long long bruh=4;
bool left=true,right=true,up=true,down=true;
if(x+1>=n){
bruh--;
up=false;
}else if(fix[(x+1)*m+y]==1 || r[(x+1)*m+y]==1){
bruh--;
up=false;
}
if(x-1<0){
bruh--;
down=false;
}else if(fix[(x-1)*m+y] || r[(x-1)*m+y]==1){
bruh--;
down=false;
}
if(y-1<0){
bruh--;
left=false;
}else if(fix[(x)*m+y-1]==1 || r[(x)*m+y-1]==1){
bruh--;
left=false;
}
if( y+1>=m){
bruh--;
right=false;
}else if(fix[(x)*m+y+1]==1 || r[(x)*m+y+1]==1){
bruh--;
right=false;
}
if(bruh==3){
fix[(x)*m+y]=1;
if(up==true){
fix[(x+1)*m+y]=1;
}
if(down==true){
fix[(x-1)*m+y]=1;
}
if(left==true){
fix[(x)*m+y-1]=1;
}
if(right==true){
fix[(x)*m+y+1]=1;
}
if(up==true){ if(x+2<n){
dfs2((x+2)*m+y);
}
}
if(right==true){
if(y+2<=m){
dfs2((x)*m+y+2);
}
}
if(left==true){
if(y-2>=0){
dfs2((x)*m+y-2);
}
}
if(down==true){
if(x-2>=0){
dfs2((x-2)*m+y);
}
}
}
if(bruh<3){
cout<<"No";
return 0;
}
if(bruh==4){
r[(x)*m+y]=2;
}
}
for(long long i=0; i<n; i++){
for(long long j=0; j<m; j++){
if(r[(i)*m+j]!=2){
continue;
}
if(i+2<n){
if(r[(i+2)*m+j]==2){
adj[i*m+j].pb((i+2)*m+j);
}
}
if(i-2>=0){
if(r[(i-2)*m+j]){
adj[i*m+j].pb((i-2)*m+j);
}
}
if(j+2<m){
if(r[(i)*m+j+2]==2){
adj[i*m+j].pb((i)*m+j+2);
}
}
if(j-2>=0){
if(r[(i)*m+j-2]==2){
adj[i*m+j].pb((i)*m+j-2);
}
}
}
}
for(long long i=0; i<n; i++){
for(long long j=0; j<m; j++){
if(fix[i*m+j]==0 && r[(i)*m+j]==2 ){
dfs(i*m+j);
if(size==3*nsize+1 && t.size()>0){
pair<long long,pair<long long,long long> > d=*t.begin();
fix[(d.se.f)*m+d.se.se]=0;
}
if(size<3*nsize){
cout<<"No"<<endl;
return 0;
}
t.clear();
nsize=0;
size=0;
}
}
}
for(long long i=0; i<n; i++){
for(long long j=0; j<m; j++){
if(fix[i*m+j]==1 ){
pas+=a[i*m+j];
}
}
}
cout<<pas;
}
Compilation message (stderr)
covering.cpp: In function 'void dfs(long long int)':
covering.cpp:46:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
46 | for(long long i=0; i<adj[p].size(); i++){
| ~^~~~~~~~~~~~~~
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