結果
| 問題 |
No.274 The Wall
|
| コンテスト | |
| ユーザー |
kei
|
| 提出日時 | 2018-10-02 23:51:48 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 3,112 bytes |
| コンパイル時間 | 1,763 ms |
| コンパイル使用メモリ | 172,592 KB |
| 実行使用メモリ | 6,820 KB |
| 最終ジャッジ日時 | 2024-10-12 10:07:20 |
| 合計ジャッジ時間 | 2,814 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 14 WA * 8 |
ソースコード
#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int INF = 1e9;
const ll LINF = 1e18;
template<class S,class T> ostream& operator << (ostream& out,const pair<S,T>& o){ out << "(" << o.first << "," << o.second << ")"; return out; }
template<class T> ostream& operator << (ostream& out,const vector<T> V){ for(int i = 0; i < V.size(); i++){ out << V[i]; if(i!=V.size()-1) out << " ";} return out; }
template<class T> ostream& operator << (ostream& out,const vector<vector<T> > Mat){ for(int i = 0; i < Mat.size(); i++) { if(i != 0) out << endl; out << Mat[i];} return out; }
template<class S,class T> ostream& operator << (ostream& out,const map<S,T> mp){ out << "{ "; for(auto it = mp.begin(); it != mp.end(); it++){ out << it->first << ":" << it->second; if(mp.size()-1 != distance(mp.begin(),it)) out << ", "; } out << " }"; return out; }
/*
<url:https://yukicoder.me/problems/no/274>
問題文============================================================
=================================================================
解説=============================================================
================================================================
*/
struct BIT {
int N;
vector<ll> bit1;
vector<ll> bit2;
BIT(ll N):N(N) {
/* BITは[1..N]で扱う */
bit1.resize(N + 1, 0);
bit2.resize(N + 1, 0);
}
void add1(int x, ll val){
while (x <= N) {
bit1[x] += val;
x += x & -x;
}
}
void add2(int x, ll val){
while (x <= N) {
bit2[x] += val;
x += x & -x;
}
}
// [l,r]
void RangeAdd(int l,int r,ll val){
// Update BIT1
add1(l,val);
add1(r+1,-val);
// Update BIT2
add2(l,val*(l-1));
add2(r+1,-val*r);
}
ll sum1(int x){
ll ret = 0;
while (x) {
ret += bit1[x];
x &= (x - 1);
}
return (ret);
}
ll sum2(int x){
ll ret = 0;
while (x) {
ret += bit2[x];
x &= (x - 1);
}
return (ret);
}
ll sum(int x){
return sum1(x)*x - sum2(x);
}
// [l,r]
ll RangeSum(int l,int r){
return sum(r) - sum(l-1);
}
};
string solve(){
int N,M; cin >> N >> M;
BIT bit(M+1);
for(int i = 0; i < N;i++){
int L,R; cin >> L >> R;
L++; R++;
int L2 = M+1-R,R2 = M+1-L;
int LL,LR,RL,RR;
if(L <= L2){
LL = L; LR = R;
RL = L2; RR = R2;
}else{
LL = L2; LR = R2;
RL = L; RR = R;
}
if(bit.RangeSum(LL, LR)==0){
bit.RangeAdd(LL,LR,1);
}else{
if(bit.RangeSum(RL,RR)==0){
bit.RangeAdd(RL,RR,1);
}else{
return "NO";
}
}
}
return "YES";
}
int main(void) {
cin.tie(0); ios_base::sync_with_stdio(false);
cout << solve() << endl;
return 0;
}
kei