Submission #40826

#	Time	Username	Problem	Language	Result	Execution time	Memory
40826		grumpy_gordon	Port Facility (JOI17_port_facility)	C++14	0 / 100	2 ms	504 KiB

port_facility

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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[maxn];

int r[maxn];

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[maxn];

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);
    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 (stderr)

port_facility.cpp: In function 'int main()':
port_facility.cpp:213:18: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'int' [-Wformat=]
     scanf("%d", n);
                  ^
port_facility.cpp:213:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", n);
                   ^
port_facility.cpp:215:130: 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;
                                                                                                                                  ^

• Subtask 1: 0 / 10
• Subtask 2: 0 / 12
• Subtask 3: 0 / 56
• Subtask 4: 0 / 22