hdu5386 Cover

Problem Description

You have an  matrix.Every
grid has a color.Now there are two types of operating:

L x y: for(int i=1;i<=n;i++)color[i][x]=y;

H x y:for(int i=1;i<=n;i++)color[x][i]=y;

Now give you the initial matrix and the goal matrix.There are  operatings.Put
in order to arrange operatings,so that the initial matrix will be the goal matrix after doing these operatings

It‘s guaranteed that there exists solution.

Input

There are multiple test cases,first line has an integer

For each case:

First line has two integer ,

Then  lines,every
line has  integers,describe
the initial matrix

Then  lines,every
line has  integers,describe
the goal matrix

Then  lines,every
line describe an operating

Output

For each case,print a line include  integers.The
i-th integer x show that the rank of x-th operating is

Sample Input

1
3 5
2 2 1
2 3 3
2 1 3
3 3 3
3 3 3
3 3 3
H 2 3
L 2 2
H 3 3
H 1 3
L 2 3

Sample Output

5 2 4 3 1

这题看了题解后。感觉挺水的。。由于保证有解，所以能够从后面往前推，遇到整行的颜色和当中没有訪问过的一个操作一样的时候。就把这一行的数都变为0（即随意颜色。由于前面的颜色会被后面的覆盖），当矩阵所有为0就输出结果。

这里假设用set存储的话注意操作符的定义，由于假设定义为x或者y间的比較。可能会把一些同样的操作删除掉。导致WA.
#include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<math.h>
#include<vector>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<string>
#include<algorithm>
using namespace std;
int gra[106][106],c[600];
struct node{
	int f,x,y,idx;
}b,temp;
bool operator <(node a,node b){
	return a.idx<b.idx;
}

set<node>myset;
set<node>::iterator it;

int main()
{
	int n,m,i,j,T,sum,a,x,y,tot,flag,f,t,flag1,idx,num1;
	char s[10];
	scanf("%d",&T);
	while(T--)
	{
		scanf("%d%d",&n,&m);
		sum=n*n;
		for(i=1;i<=n;i++){
			for(j=1;j<=n;j++){
				scanf("%d",&a);
			}
		}
		for(i=1;i<=n;i++){
			for(j=1;j<=n;j++){
				scanf("%d",&gra[i][j]);
			}
		}
		myset.clear();
		for(i=1;i<=m;i++){
			scanf("%s%d%d",s,&x,&y);
            if(s[0]==‘L‘){
            	b.f=1;
            }
            else b.f=0;
            b.x=x;b.y=y;b.idx=i;
            myset.insert(b);
		}
		t=0;
		while(1)
		{
			//if(myset.size()==0)break;// || sum==0
			if(sum==0)break;
			flag=0;
			for(it=myset.begin();it!=myset.end();it++){
				temp=*it;
				x=temp.x;y=temp.y;f=temp.f;idx=temp.idx;
				if(f==1){
					flag1=1;tot=0;
					for(i=1;i<=n;i++){
						if(gra[i][x]==0)continue;
						if(gra[i][x]==y)tot++;
						else{
							flag1=0;break;
						}
					}
					if(tot==0 || flag1==0)continue;

					flag=1;
					for(i=1;i<=n;i++){
						if(gra[i][x]==0)continue;
						else {gra[i][x]=0;sum--;}
					}
					t++;c[t]=idx;
					myset.erase(it);break;
				}

				else if(f==0){
					flag1=1;tot=0;
					for(i=1;i<=n;i++){
						if(gra[x][i]==0)continue;
						if(gra[x][i]==y)tot++;
						else{
							flag1=0;break;
						}
					}
					if(tot==0 || flag1==0)continue;

					flag=1;
					for(i=1;i<=n;i++){
						if(gra[x][i]==0)continue;
						else {gra[x][i]=0;sum--;}
					}
					t++;c[t]=idx;
					myset.erase(it);break;
				}
			}
			if(!flag)break;
		}
		for(i=1;i<=m;i++){
			flag=0;
			for(j=1;j<=t;j++){
				if(i==c[j]){
					flag=1;break;
				}
			}
			if(flag==0){
				printf("%d ",i);
			}
		}
		for(i=t;i>=1;i--){
			if(i==1)printf("%d\n",c[i]);
			else printf("%d ",c[i]);
		}
	}
	return 0;
}
/*
100
3 7
2 2 1
2 3 3
2 1 3
3 2 2
1 1 2
1 1 1
L 2 3
L 1 3
H 2 1
H 3 3
L 4 3
L 3 2
H 3 1
*/