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#include <bits/stdc++.h>
//#pragma GCC optimize("O3")
//#pragma GCC optimize("Ofast,no-stack-protector")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx")
//#pragma GCC target("avx,tune=native")
//float __attribute__((aligned(32)))
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
int mysqrt(ll x){
int l = 0, r = 1e9 + 1;
while (r - l > 1){
int m = (l + r) / 2;
if (m * (ll)m <= x)
l = m;
else
r = m;
}
return l;
}
mt19937 rnd(1337);
ll AR = 19, BR = 13, CR = 23, XR = 228, YR = 322, MODR = 1e9 + 993;
ll myrand(){
ll ZR = (XR * AR + YR * BR + CR) % MODR;
XR = YR;
YR = ZR;
return ZR;
}
const int Mod = 1e9 + 7;
int bpow(int x, int y){
if (y == 0)
return 1;
if (y == 1)
return x;
int ret = bpow(x, y >> 1);
ret = (ret * (ll)ret) % Mod;
if (y & 1)
ret = (ret * (ll)x) % Mod;
return ret;
}
int bdiv(int x, int y){
return (x * (ll)bpow(y, Mod - 2)) % Mod;
}
void setmin(int &x, int y){
x = min(x, y);
}
void setmax(int &x, int y){
x = max(x, y);
}
void setmin(ll &x, ll y){
x = min(x, y);
}
void setmax(ll &x, ll y){
x = max(x, y);
}
int gcd(int a, int b){
return a ? gcd(b % a, a) : b;
}
const ll llinf = 2e18 + 100;
const int maxn = 2e5 + 100, maxw = 1e6 + 100, inf = 2e9 + 100, sq = 300, mod = 1e9 + 7, LG = 17;
pair<int, int> a[maxw];
int arr[2 * maxw];
int n;
vector<pair<int, int> > g;
int p[maxw];
int r[maxw];
int get(int x){
return x == p[x] ? x : p[x] = get(p[x]);
}
void uni(int x, int y){
x = get(x);
y = get(y);
if (x == y)
return;
if (r[x] < r[y])
swap(x, y);
p[y] = x;
if (r[x] == r[y])
r[x]++;
}
bool used[maxw];
int main()
{
#ifdef ONPC
//ifstream cin("a.in");
//ofstream cout("a.out");
freopen("a.in", "r", stdin);
freopen("a.out", "w", stdout);
#else
//ifstream cin("sprinklers.in");
//ofstream cout("sprinklers.out");
//freopen("road.in", "r", stdin);
//freopen("road.out", "w", stdout);
#endif // ONPC
//ios::sync_with_stdio(0);
//cin.tie(0);
//cout.tie(0);
printf("0");
return 0;
scanf("%d", &n);
for (int i = 0; i < n; i++)
scanf("%d%d", &a[i].first, &a[i].second), a[i].first--, a[i].second--, arr[a[i].first] = i + 1, arr[a[i].second] = -i - 1;
for (int i = 0; i < n; i++)
p[i] = i;
stack<int> q;
for (int i = 0; i < 2 * n; i++){
int id = abs(arr[i]) - 1;
if (arr[i] < 0){
if (!q.empty() && q.top() == id)
q.pop();
continue;
}
int last = -1;
while (!q.empty() && a[q.top()].second < a[id].second){
if (last != -1)
uni(last, q.top());
else
last = q.top();
q.pop();
}
if (last != -1)
g.push_back(make_pair(last, id));
q.push(id);
if (last != -1)
q.push(last);
}
for (auto it : g)
if (get(it.first) == get(it.second)){
printf("0");
return 0;
}
for (auto it : g)
uni(it.first, it.second);
int ans = 1;
for (int i = 0; i < n; i++)
if (!used[get(i)])
ans = (ans * 2) % mod, used[get(i)] = 1;
printf("%d", ans);
}
Compilation message
port_facility.cpp: In function 'int main()':
port_facility.cpp:215:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &n);
^
port_facility.cpp:217:130: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d", &a[i].first, &a[i].second), a[i].first--, a[i].second--, arr[a[i].first] = i + 1, arr[a[i].second] = -i - 1;
^
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
2 ms |
248 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
2 ms |
248 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
2 ms |
248 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
2 ms |
248 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
