50 lines
1.1 KiB
C++
50 lines
1.1 KiB
C++
#include <algorithm>
|
|
#include <iostream>
|
|
#include <cstring>
|
|
#include <cstdio>
|
|
#include <cstring>
|
|
#include <cstdlib>
|
|
using namespace std;
|
|
#define MAXN 110
|
|
int t , n , m;
|
|
int flag;
|
|
int x[MAXN] , r[MAXN];
|
|
int tmp_x[MAXN] , tmp_r[MAXN];
|
|
int search(){
|
|
for(int i = 1 ; i < n ; i++){
|
|
if(tmp_x[i] > tmp_x[i-1]) return i;
|
|
}
|
|
return 0;
|
|
}
|
|
void solve(){
|
|
int k;
|
|
memset(tmp_ , 0 , sizeof(tmp_x));
|
|
memcpy(tmp_ , r , sizeof(r));
|
|
sort(tmp_ , tmp_r+n);
|
|
for(int i = 0 ; i < n ; i++){
|
|
for(int j = 0 ; j < n ; j++){
|
|
if(tmp_r[i] == r[j]){
|
|
tmp_x[i] = x[j] ; break;
|
|
}
|
|
}
|
|
}
|
|
while(k = search()){
|
|
for(int i = 0 ; i < k ; i++) tmp_x[i] += 400;
|
|
}
|
|
if(tmp_x[0] <= m) flag = 1;
|
|
}
|
|
int main() {
|
|
scanf("%d" , &t);
|
|
while(t--){
|
|
memset(x , 0 , sizeof(x));
|
|
memset(r , 0 , sizeof(r));
|
|
scanf("%d%d" ,&n , &m);
|
|
for(int i = 0 ; i < n ; i++)
|
|
scanf("%d%d" , &x[i] , &r[i]);
|
|
flag = 0 ; solve();
|
|
if(flag) printf("YES\n");
|
|
else printf("NO\n");
|
|
}
|
|
return 0;
|
|
}
|