| # |
제출 시각 |
아이디 |
문제 |
언어 |
결과 |
실행 시간 |
메모리 |
| 594947 |
2022-07-13T07:37:44 Z |
조영욱(#8439) |
물병 (JOI14_bottle) |
C++14 |
|
2601 ms |
524288 KB |
#include <bits/stdc++.h>
using namespace std;
int n,m,pp,q;
typedef pair<int,int> P;
char arr[2000][2001]; //4
int xp[200000];
int yp[200000];
int s[200000];
int t[200000];
int lo[200000]; //�Ұ���
int hi[200000]; //����
int mid[200000]; //5
vector<int> dist[4001];
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};
vector<int> p;
vector<P> vec;
int lrx[6]={-1,0,1,1,0,-1};
int lry[6]={-1,-2,-1,1,2,1};
int udx[6]={-1,-2,-1,1,2,1};
int udy[6]={1,0,-1,-1,0,1};
int ret[200000]; //1
int val[4000000]; //16
typedef pair<P,int> Pi;
Pi edge[8000000];
int st[4000000];
vector<int> son[4000000]; //64
int f=0;
int top[4000000];
int ind[4000000];
int par[4000000];
const int siz=(1<<22);
int seg[siz*2];
int sum(int l,int r,int node=1,int nodel=0,int noder=siz-1) {
if (r<nodel||l>noder) {
return 0;
}
if (l<=nodel&&noder<=r) {
return seg[node];
}
int mid=(nodel+noder)/2;
return max(sum(l,r,node*2,nodel,mid),sum(l,r,node*2+1,mid+1,noder));
}
void update(int i,int val) {
i+=siz;
seg[i]=val;
while (i>1) {
i/=2;
seg[i]=max(seg[i*2],seg[i*2+1]);
}
}
void dfs_sz(int v,int prev) {
par[v]=prev;
seg[v]=1;
for(int i=st[v];;i++) {
if (edge[i].first.first!=v) {
break;
}
int nt=edge[i].first.second;
if (nt==prev) {
continue;
}
val[nt]=edge[i].second;
son[v].push_back(nt);
dfs_sz(nt,v);
seg[v]+=seg[nt];
if (seg[nt]>seg[son[v][0]]) {
swap(son[v][0],son[v][son[v].size()-1]);
}
}
}
void dfs_hld(int v) {
ind[v]=f++;
update(ind[v],val[v]);
for(int i=0;i<son[v].size();i++) {
int nt=son[v][i];
if (i==0) {
top[nt]=top[v];
dfs_hld(nt);
}
else {
top[nt]=nt;
dfs_hld(nt);
}
}
}
int query(int u,int v) {
int cnt=0;
int ret=0;
while (1) {
if (top[u]==top[v]) {
break;
}
if (ind[top[u]]>ind[top[v]]) {
ret=max(ret,sum(ind[top[u]],ind[u]));
u=par[top[u]];
}
else {
ret=max(ret,sum(ind[top[v]],ind[v]));
v=par[top[v]];
}
}
if (ind[u]<ind[v]) {
swap(u,v);
}
ret=max(ret,sum(ind[v]+1,ind[u]));
return ret;
}
bool valid(int x,int y) {
return x>=0&&x<n&&y>=0&&y<m&&arr[x][y]!='#';
}
bool valid1(int x,int y) {
return x>=0&&x<=2*n&&y>=0&&y<=2*m;
}
int find(int a) {
return p[a]<0?a:p[a]=find(p[a]);
}
void merge(int a,int b) {
a=find(a);
b=find(b);
if (a==b) {
return;
}
p[b]=a;
}
int main(void) {
scanf("%d %d %d %d",&n,&m,&pp,&q);
for(int i=0;i<n;i++) {
scanf("%s",arr[i]);
}
for(int i=0;i<pp;i++) {
scanf("%d %d",&xp[i],&yp[i]);
xp[i]--;
yp[i]--;
}
for(int i=0;i<q;i++) {
scanf("%d %d",&s[i],&t[i]);
s[i]--;
t[i]--;
}
for(int i=0;i<q;i++) {
lo[i]=0;
hi[i]=((n*m)/2+1)*2;
}
int chk=0;
while (1) {
bool flag=true;
int cnt=0;
for(int i=0;i<n;i++){
dist[i].resize(m);
for(int j=0;j<m;j++) {
dist[i][j]=-1;
}
}
p.resize(n*m);
for(int i=0;i<n*m;i++) {
p[i]=-1;
}
queue<P> que;
for(int i=0;i<pp;i++) {
que.push(P(xp[i],yp[i]));
//vis[xp[i]][yp[i]]=true;
dist[xp[i]][yp[i]]=0;
}
for(int i=1;i<n*m;i++) {
while (!que.empty()) {
P now=que.front();
if (dist[now.first][now.second]>=i) {
break;
}
que.pop();
int x=now.first;
int y=now.second;
for(int j=0;j<4;j++) {
if (valid(x+dx[j],y+dy[j])) {
int nt=(x+dx[j])*m+y+dy[j];
if (find(x*m+y)!=find(nt)) {
edge[chk++]=Pi(P(x*m+y,nt),i);
edge[chk++]=Pi(P(nt,x*m+y),i);
merge(x*m+y,nt);
}
if (dist[x+dx[j]][y+dy[j]]==-1) {
que.push(P(x+dx[j],y+dy[j]));
dist[x+dx[j]][y+dy[j]]=dist[x][y]+1;
}
}
}
}
}
for(int i=0;i+1<n*m;i++) {
if (find(i)!=find(i+1)) {
edge[chk++]=Pi(P(i,i+1),((n*m)/2+1));
edge[chk++]=Pi(P(i+1,i),((n*m)/2+1));
merge(i,i+1);
}
}
sort(edge,edge+chk);
memset(st,-1,sizeof(st));
for(int i=chk-1;i>=0;i--) {
st[edge[i].first.first]=i;
}
dfs_sz(0,-1);
memset(seg,0,sizeof(seg));
top[0]=0;
dfs_hld(0);
for(int i=0;i<q;i++) {
int one=s[i];
int two=t[i];
int got=query(xp[one]*m+yp[one],xp[two]*m+yp[two]);
lo[i]=2*got-2;
hi[i]=2*got;
}
break;
}
for(int i=0;i<=2*n;i++) {
dist[i].resize(2*m+1);
for(int j=0;j<dist[i].size();j++) {
dist[i][j]=-1;
}
}
p.resize((2*n+1)*(2*m+1));
for(int i=0;i<p.size();i++) {
p[i]=-1;
}
for(int i=0;i<n*m;i++){
vector<int>().swap(son[i]);
}
int cnt=0;
for(int i=0;i<q;i++) {
//printf("%d %d\n",lo[i],hi[i]);
if (hi[i]==((n*m)/2+1)*2) {
ret[i]=0;
continue;
}
vec.push_back(P((lo[i]+1)/2,i));
cnt++;
}
sort(vec.begin(),vec.end());
int len=2*m+1;
queue<P> que;
for(int i=0;i<pp;i++) {
for(int j=0;j<4;j++) {
int nx=2*xp[i]+1+dx[j];
int ny=2*yp[i]+1+dy[j];
merge((2*xp[i]+1)*len+(2*yp[i]+1),nx*len+ny);
if (dist[nx][ny]==-1) {
que.push(P(nx,ny));
dist[nx][ny]=0;
}
}
}
int idx=0;
for(int i=0;cnt;i++) {
while (idx<vec.size()&&vec[idx].first==i) {
int one=s[vec[idx].second];
int two=t[vec[idx].second];
cnt--;
if (find((2*xp[one]+1)*len+(2*yp[one]+1))==find((2*xp[two]+1)*len+(2*yp[two]+1))) {
ret[vec[idx].second]=2*i+1;
}
else {
ret[vec[idx].second]=2*i+2;
}
idx++;
}
if (cnt==0) {
break;
}
//printf("%d\n",i);
while (!que.empty()) {
P now=que.front();
if (dist[now.first][now.second]>i) {
break;
}
que.pop();
int x=now.first;
int y=now.second;
if (x%2==1) {
for(int j=0;j<6;j++) {
if (valid1(x+lrx[j],y+lry[j])) {
int nx=x+lrx[j];
int ny=y+lry[j];
if (j<3) {
if (arr[x/2][y/2-1]!='#') {
//printf("%d %d %d %d\n",x,y,nx,ny);
merge(x*len+y,nx*len+ny);
if (dist[nx][ny]==-1) {
que.push(P(nx,ny));
dist[nx][ny]=dist[x][y]+1;
}
}
}
else {
if (arr[x/2][y/2]!='#') {
//printf("%d %d %d %d\n",x,y,nx,ny);
merge(x*len+y,nx*len+ny);
if (dist[nx][ny]==-1) {
que.push(P(nx,ny));
dist[nx][ny]=dist[x][y]+1;
}
}
}
}
}
}
else {
for(int j=0;j<6;j++) {
if (valid1(x+udx[j],y+udy[j])) {
int nx=x+udx[j];
int ny=y+udy[j];
if (j<3) {
if (arr[x/2-1][y/2]!='#') {
//printf("%d %d %d %d\n",x,y,nx,ny);
merge(x*len+y,nx*len+ny);
if (dist[nx][ny]==-1) {
que.push(P(nx,ny));
dist[nx][ny]=dist[x][y]+1;
}
}
}
else {
if (arr[x/2][y/2]!='#') {
//printf("%d %d %d %d\n",x,y,nx,ny);
merge(x*len+y,nx*len+ny);
if (dist[nx][ny]==-1) {
que.push(P(nx,ny));
dist[nx][ny]=dist[x][y]+1;
}
}
}
}
}
}
}
}
for(int i=0;i<q;i++) {
printf("%d\n",ret[i]-1);
}
}
Compilation message
bottle.cpp: In function 'void dfs_hld(int)':
bottle.cpp:82:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
82 | for(int i=0;i<son[v].size();i++) {
| ~^~~~~~~~~~~~~~
bottle.cpp: In function 'int query(int, int)':
bottle.cpp:96:5: warning: unused variable 'cnt' [-Wunused-variable]
96 | int cnt=0;
| ^~~
bottle.cpp: In function 'int main()':
bottle.cpp:159:14: warning: unused variable 'flag' [-Wunused-variable]
159 | bool flag=true;
| ^~~~
bottle.cpp:160:13: warning: unused variable 'cnt' [-Wunused-variable]
160 | int cnt=0;
| ^~~
bottle.cpp:229:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
229 | for(int j=0;j<dist[i].size();j++) {
| ~^~~~~~~~~~~~~~~
bottle.cpp:234:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
234 | for(int i=0;i<p.size();i++) {
| ~^~~~~~~~~
bottle.cpp:266:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
266 | while (idx<vec.size()&&vec[idx].first==i) {
| ~~~^~~~~~~~~~~
bottle.cpp:139:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
139 | scanf("%d %d %d %d",&n,&m,&pp,&q);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
bottle.cpp:141:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
141 | scanf("%s",arr[i]);
| ~~~~~^~~~~~~~~~~~~
bottle.cpp:144:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
144 | scanf("%d %d",&xp[i],&yp[i]);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
bottle.cpp:149:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
149 | scanf("%d %d",&s[i],&t[i]);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
68 ms |
144148 KB |
Output is correct |
| 2 |
Correct |
73 ms |
144760 KB |
Output is correct |
| 3 |
Correct |
88 ms |
147148 KB |
Output is correct |
| 4 |
Correct |
358 ms |
153012 KB |
Output is correct |
| 5 |
Correct |
344 ms |
152996 KB |
Output is correct |
| 6 |
Correct |
381 ms |
153012 KB |
Output is correct |
| 7 |
Correct |
317 ms |
153540 KB |
Output is correct |
| 8 |
Correct |
314 ms |
154280 KB |
Output is correct |
| 9 |
Correct |
217 ms |
154840 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
185 ms |
166432 KB |
Output is correct |
| 2 |
Correct |
321 ms |
181992 KB |
Output is correct |
| 3 |
Runtime error |
1959 ms |
524288 KB |
Execution killed with signal 9 |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
219 ms |
166596 KB |
Output is correct |
| 2 |
Correct |
337 ms |
182372 KB |
Output is correct |
| 3 |
Runtime error |
1891 ms |
524288 KB |
Execution killed with signal 9 |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
2601 ms |
524288 KB |
Execution killed with signal 9 |
| 2 |
Halted |
0 ms |
0 KB |
- |
