이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
#define all(a) a.begin() , a.end()
#define F first
#define S second
using namespace std;
using ll = long long;
const int N = 1e6+5 , inf = 2e9 + 7;
const ll INF = 1e18 , mod = 1e9+7 , P = 6547;
int u[N];
int p[N] , sz[N] , col[N] , q[N];
int get(int v) {
if(v == p[v]) return v;
return get(p[v]);
}
int getc(int v) {
if(v == p[v]) return q[v];
return getc(p[v])^1^q[v];
}
int merge(int a , int b) {
int tb = b , ta = a;
a = get(a);
b = get(b);
if(a == b) return 0;
if(sz[a] < sz[b]) swap(a , b);
if(getc(tb)%2 != getc(ta)%2) {
q[b] ^= 1;
}
sz[a] += sz[b];
p[b] = a;
// cout << ta << ' ' << tb << '\n';
return 1;
}
void solve(int tc) {
int n;
cin >> n;
vector<pair<int,int>> v;
for(int i = 1; i <= n; i ++) {
int a , b;
cin >> a >> b;
v.push_back({a , b});
p[i] = i;
sz[i] = 1;
col[i] = 1;
}
sort(all(v));
set<pair<int,int>> st;
int cnt = n;
for(int i = 0; i < v.size(); i ++) {
pair<int,int> to = v[i];
int last = 2*n;
while(st.size() && st.begin()->F < v[i].F) {
st.erase(*st.begin());
}
auto it = st.begin();
// cout << i << '\n';
while(it != st.end() && it->F < to.S) {
if(v[it->S - 1].F >= last) {
cout << 0;
return;
}
if(merge(it->S , i+1))
cnt --;
else {
// cout << it->S << ' ' << i+1 << '\n';
// cout << getc(it->S) << ' ' << getc(i+1) << '\n';
if((getc(it->S) + getc(i+1)) % 2 == 0) {
cout << 0;
return;
}
}
// if(i == 3) {
// for(int j = 1; j <= n; j ++) {
// cout << getc(j) << ' ';
// }cout << '\n';
// }
last = v[it->S - 1].F;
it ++;
}
st.insert({to.S , i+1});
}
ll ans = 1;
for(int i = 1; i <= cnt; i ++) {
ans *= 2;
ans %= mod;
}
cout << ans;
}
/*
5
1 9
2 4
3 7
5 10
6 8
4
1 4
2 7
3 6
5 8
*/
main() {
ios;
int tt = 1 , tc = 0;
// cin >> tt;
while(tt --) {
solve(++tc);
}
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
port_facility.cpp: In function 'void solve(int)':
port_facility.cpp:59:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
59 | for(int i = 0; i < v.size(); i ++) {
| ~~^~~~~~~~~~
port_facility.cpp: At global scope:
port_facility.cpp:115:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
115 | main() {
| ^~~~
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