Luogu3936 Coloring（模拟退火）

　　裸退火，每次交换两个格子即可。依旧不会调参，稍微抄了点参数并且把随机种子设成了一个神奇的数字终于过掉了。

#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstdlib>
#include<cstring>
#include<algorithm>
#include<ctime>
using namespace std;
#define ll long long
#define N 22
#define M 55
#define T0 1
#define T1 1E-14
#define delta 0.9999
char getc(){char c=getchar();while ((c<'A'||c>'Z')&&(c<'a'||c>'z')&&(c<''||c>'')) c=getchar();return c;}
int gcd(int n,int m){return m==?n:gcd(m,n%m);}
int read()
{
    int x=,f=;char c=getchar();
    while (c<''||c>'') {if (c=='-') f=-;c=getchar();}
    while (c>=''&&c<='') x=(x<<)+(x<<)+(c^),c=getchar();
    return x*f;
}
int n,m,c,a[M],color[N][N],cnt,ans,goal[N][N];
int wx[]={,,,-},wy[]={,,-,};
int calc(int x,int y)
{
    int t=;
    for (int k=;k<;k++)
    if (x+wx[k]>=&&x+wx[k]<=n&&y+wy[k]>=&&y+wy[k]<=m)
        if (color[x][y]!=color[x+wx[k]][y+wy[k]]) t++;
    return t;
}
void anneal()
{
    double T=T0;
    while (T>T1)
    {
        int x1=rand()%n+,y1=rand()%m+,x2=rand()%n+,y2=rand()%m+;
        while (x1==x2||y1==y2) x1=rand()%n+,y1=rand()%m+,x2=rand()%n+,y2=rand()%m+;
        int d=;
        d-=calc(x1,y1),d-=calc(x2,y2);
        swap(color[x1][y1],color[x2][y2]);
        d+=calc(x1,y1),d+=calc(x2,y2);
        if (d<||rand()<exp(-d/T)*RAND_MAX) cnt+=d;
        else swap(color[x1][y1],color[x2][y2]);
        if (cnt<ans) ans=cnt,memcpy(goal,color,sizeof(color));
        T*=delta;
    }
}
int main()
{
#ifndef ONLINE_JUDGE
    freopen("color.in","r",stdin);
    freopen("color.out","w",stdout);
    const char LL[]="%I64d\n";
#else
    const char LL[]="%lld\n";
#endif
    n=read(),m=read(),c=read();
    srand();
    for (int i=;i<=c;i++) a[i]=read();
    int x=,y=;
    for (int i=;i<=c;i++)
    while (a[i])
    {
        color[x][y]=i;
        a[i]--;y++;
        if (y>m) x++,y=;
    }
    for (int i=;i<=n;i++)
        for (int j=;j<=m;j++)
            for (int k=;k<;k++)
            if (i+wx[k]>=&&i+wx[k]<=n&&j+wy[k]>=&&j+wy[k]<=m)
                if (color[i][j]!=color[i+wx[k]][j+wy[k]]) cnt++;
    ans=cnt>>=;
    memcpy(goal,color,sizeof(color));
    for (int i=;i<=;i++) anneal();
    for (int i=;i<=n;i++)
    {
        for (int j=;j<=m;j++)
        cout<<goal[i][j]<<' ';
        cout<<endl;
    }
    return ;
}