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| #include<cstdio>
#include<vector>
#include<random>
#include<ctime>
#include<cmath>
#define For(i,l,r) for(int i=l;i<r;++i)
using namespace std;
const int N=500,D=8;
const int dx[D]={0,-1,-1,-1,0,1,1,1},dy[D]={1,1,0,-1,-1,-1,0,1};
const double T0=100,TD=0.9999999;
int n,m;
char mp[N][N];
int id[N][N][D];
int goal;
namespace random {
mt19937 rnd(time(0));
inline double rand01()
{
return (double)rnd()/0xffffffff;
}
inline int rand(int l,int r)
{
return l+rnd()%(r-l+1);
}
}
namespace graph {
int p;
vector<int>e[N*N+1];
struct plan {
bool sel[N*N+1];
int cnt;
plan()
{
cnt=0,fill(sel,sel+N*N+1,false);
return;
}
};
inline int newPoint()
{
return ++p;
}
inline void addEdge(int u,int v)
{
e[u].push_back(v),e[v].push_back(u);
return;
}
int calc(plan *pla,int u)
{
int ret=1;
for(int v:e[u]) {
if(pla->sel[v]) {
--ret;
}
}
return ret;
}
void select(plan &pla,int u)
{
pla.sel[u]=true,++pla.cnt;
for(int v:e[u]) {
if(pla.sel[v]) {
pla.sel[v]=false,--pla.cnt;
}
}
return;
}
}
inline bool checkMp(int x,int y,char c)
{
return (x>=0)&&(x<n)&&(y>=0)&&(y<m)&&(mp[x][y]==c);
}
void generateGraph()
{
For(i,0,n) {
For(j,0,m) {
if(mp[i][j]!='W') {
continue;
}
For(d,0,D) {
if(checkMp(i+dx[d],j+dy[d],'P')&&checkMp(i-dx[d],j-dy[d],'G')) {
id[i][j][d]=graph::newPoint();
}
}
}
}
For(i,0,n) {
For(j,0,m) {
switch(mp[i][j]) {
case 'W': {
For(d1,0,D-1) {
if(!id[i][j][d1]) {
continue;
}
For(d2,d1+1,D) {
if(id[i][j][d2]) {
graph::addEdge(id[i][j][d1],id[i][j][d2]);
}
}
}
break;
}
case 'P': {
For(d1,0,D-1) {
if(!checkMp(i-dx[d1],j-dy[d1],'W')||!checkMp(i-dx[d1]*2,j-dy[d1]*2,'G')) {
continue;
}
For(d2,d1+1,D) {
if(checkMp(i-dx[d2],j-dy[d2],'W')&&checkMp(i-dx[d2]*2,j-dy[d2]*2,'G')) {
graph::addEdge(id[i-dx[d1]][j-dy[d1]][d1],id[i-dx[d2]][j-dy[d2]][d2]);
}
}
}
break;
}
case 'G': {
For(d1,0,D-1) {
if(!checkMp(i+dx[d1],j+dy[d1],'W')||!checkMp(i+dx[d1]*2,j+dy[d1]*2,'P')) {
continue;
}
For(d2,d1+1,D) {
if(checkMp(i+dx[d2],j+dy[d2],'W')&&checkMp(i+dx[d2]*2,j+dy[d2]*2,'P')) {
graph::addEdge(id[i+dx[d1]][j+dy[d1]][d1],id[i+dx[d2]][j+dy[d2]][d2]);
}
}
}
break;
}
}
}
}
return;
}
double T=T0;
graph::plan res;
void simulatedAnnealing()
{
using namespace graph;
plan sol;
for(int cnt=1;sol.cnt<goal;++cnt) {
int u;
do {
u=random::rand(1,p);
} while(sol.sel[u]);
int tem=calc(&sol,u);
if((tem>=0)||(random::rand01()<=exp((double)tem/T))) {
select(sol,u);
}
T*=TD;
if(cnt%100000==0) {
fprintf(stderr,"Cnt: %d, Tem: %lf, Sol: %d\n",cnt,T,sol.cnt);
}
}
res=sol;
return;
}
struct output {
~output()
{
For(i,0,n) {
For(j,0,m) {
if(mp[i][j]=='W') {
bool flag=false;
For(d,0,D) {
if(res.sel[id[i][j][d]]) {
putchar("-/|\\-/|\\"[d]);
flag=true;
break;
}
}
if(!flag) {
putchar('W');
}
} else {
putchar(mp[i][j]);
}
}
putchar('\n');
}
return;
}
}op;
int main(int argc,char *argv[])
{
freopen(argv[1],"r",stdin);
freopen(argv[2],"w",stdout);
scanf("%d%d",&n,&m);
For(i,0,n) {
scanf("%s",mp[i]);
}
generateGraph();
sscanf(argv[3],"%d",&goal);
simulatedAnnealing();
fputs("Finish.\n",stderr);
return 0;
}
|