Submission #43447

#	Time	Username	Problem	Language	Result	Execution time	Memory
43447		grumpy_gordon	Sightseeing (NOI14_sightseeing)	C++14	15 / 25	3580 ms	125948 KiB

sightseeing

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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;

typedef unsigned int uint;

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);

mt19937_64 rndll(12365);

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 double eps = 1e-9;

const int maxn = 5e5 + 100, maxw = 1e6 + 100, inf = 2e9 + 100, sq = 300, mod = 1e9 + 7, LG = 17;

int n, M, zap;

int quer[maxn];

int ans[maxn];

int p[maxn];

int rnk[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 (rnk[x] < rnk[y])
        swap(x, y);
    p[y] = x;
    if (rnk[x] == rnk[y])
        rnk[x]++;
}

vector<pair<int, int> > e[maxn];

pair<int, int> b[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("gymnasts.in");
    //ofstream cout("gymnasts.out");
    //freopen("post.in", "r", stdin);
    //freopen("post.out", "w", stdout);
    #endif // ONPC
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> M >> zap;
    for (int i = 0; i < M; i++){
        int v, u, w;
        cin >> v >> u >> w;
        e[w].push_back(make_pair(v - 1, u - 1));
    }
    int V = 1e5;
    for (int i = 0; i < zap; i++)
        cin >> quer[i], quer[i]--;
    for (int i = 0; i < n; i++)
        b[i] = make_pair(0, V);
    for (int its = 0; its < LG; its++){
        for (int i = 0; i < n; i++)
            p[i] = i, rnk[i] = 0;
        vector<vector<int> > q((int)V + 1);
        for (int i = 1; i < n; i++){
            int l = b[i].first, r = b[i].second;
            if (r - l > 1){
                int m = (l + r) / 2;
                q[m].push_back(i);
            }
        }
        for (int i = V; i > 0; i--){
            for (auto ed : e[i])
                uni(ed.first, ed.second);
            for (auto j : q[i])
            if (get(j) == get(0))
                b[j].first = (b[j].first + b[j].second) / 2;
            else
                b[j].second = (b[j].first + b[j].second) / 2;
        }
    }
    for (int i = 0; i < zap; i++)
        cout << b[quer[i]].first << '\n';
}

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 6 / 6
• Subtask 4: 0 / 10