Submission #962637

#	Time	Username	Problem	Language	Result	Execution time	Memory
962637		Whisper	Stranded Far From Home (BOI22_island)	C++17	100 / 100	93 ms	21420 KiB

island

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#define int long long
#define FOR(i, a, b) for (int i = a; i <= b; i++)
#define FORD(i, a, b) for (int i = b; i >= a; i --)
#define REP(i, n) for (int i = 0; i < n; ++i)
#define REPD(i, n) for (int i = n - 1; i >= 0; --i)

#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)

constexpr ll LINF = (1ll << 60);
constexpr int INF = (1ll << 30);
constexpr int Mod = 1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

void setupIO(){
    #define name "Whisper"
    //Phu Trong from Nguyen Tat Thanh High School for gifted student
    srand(time(NULL));
    cin.tie(nullptr)->sync_with_stdio(false); cout.tie(nullptr);
    //freopen(name".inp", "r", stdin);
    //freopen(name".out", "w", stdout);
    cout << fixed << setprecision(10);
}

template <class X, class Y>
    bool minimize(X &x, const Y &y){
        X eps = 1e-9;
        if (x > y + eps) {x = y; return 1;}
        return 0;
    }

template <class X, class Y>
    bool maximize(X &x, const Y &y){
        X eps = 1e-9;
        if (x + eps < y) {x = y; return 1;}
        return 0;
    }
const int MAX = 2e5 + 5;
int numNode, numEdge;
struct Edge{
    int u, v, w;
    Edge(){}
    Edge(int _u, int _v, int _w): u(_u), v(_v), w(_w){}
    int other(int x){ return (u ^ v ^ x); }
    bool operator < (const Edge& oth) const{
        return w < oth.w;
    }
} edge[MAX];
int label[MAX];

int par[MAX], sz[MAX], sum[MAX];

bool bad[MAX];

int find(int u){
    if(u == par[u]) return u;
    int v = find(par[u]);
    bad[u] |= bad[par[u]];
    return par[u] = v;
}

bool unite(int u, int v){
    u = find(u), v = find(v);
    if(u == v) return false;
    if(label[u] < label[v]) swap(u, v);
    if (label[u] > sum[v]) bad[v] = 1;
    sum[u] += sum[v];
    par[v] = u;
    return true;
}
void Whisper(){
    cin >> numNode >> numEdge;
    for (int i = 1; i <= numNode; ++i) cin >> label[i];
    FOR(i, 1, numNode){
        par[i] = i, sz[i] = 1, sum[i] = label[i];
    }

    vector<Edge> ed;
    for (int i = 1; i <= numEdge; ++i){
        cin >> edge[i].u >> edge[i].v;
        int w = max(label[edge[i].u], label[edge[i].v]);
        ed.push_back(Edge(edge[i].u, edge[i].v, w));
    }

    sort(ed.begin(), ed.end());
    for (int i = 0; i < numEdge; ++i){
        int u = ed[i].u, v = ed[i].v;
        unite(u, v);
    }
    for (int i = 1; i <= numNode; ++i){
        find(i);
        cout << !bad[i];
    }
}


signed main(){
    setupIO();
    int Test = 1;
//    cin >> Test;
    for ( int i = 1 ; i <= Test ; i++ ){
        Whisper();
        if (i < Test) cout << '\n';
    }
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 30 / 30
• Subtask 5: 35 / 35