[codeforces 1294B] Collecting Packages 排序+字符串

[codeforces 1294B]  Collecting Packages  排序+字符串

总目录详见https://blog.csdn.net/mrcrack/article/details/103564004

在线测评地址http://codeforces.com/contest/1294/problem/B

#include <cstdio>
#include <algorithm>
char out[2010];
using namespace std;
struct node{
	int x,y;
}a[1010];
int cmp(node a,node b){
	return a.x==b.x?a.y<b.y:a.x<b.x;
}
int main(){
	int t,n,i,j,cnt,check;
	scanf("%d",&t);
	while(t--){
		scanf("%d",&n);
		for(i=1;i<=n;i++)scanf("%d%d",&a[i].x,&a[i].y);
		sort(a+1,a+1+n,cmp);
		cnt=0,check=0;
		for(i=1;i<=n;i++)
			if(a[i].x>=a[i-1].x&&a[i].y>=a[i-1].y){
				for(j=a[i-1].x;j<a[i].x;j++)out[cnt++]='R';
				for(j=a[i-1].y;j<a[i].y;j++)out[cnt++]='U';
			}
			else{
				printf("NO\n");
				check=1;
				break;
			}
		if(!check)out[cnt]='\0',printf("YES\n%s\n",out);
	}
	return 0;
}