Submission #1085875

#	Time	Username	Problem	Language	Result	Execution time	Memory
1085875		sergio_sak	Drivers (BOI24_drivers)	C++14	100 / 100	304 ms	15412 KiB

Main

#include <iostream>
#include <algorithm>
#include <utility>
#include <vector>
#include <bit>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <stack>
#include <queue>
#include <deque>
#include <string>
#include <time.h>
#include <random>
#include <inttypes.h>

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp> 

using namespace __gnu_pbds;

#pragma GCC target("avx,avx2,fma")
#pragma GCC optimize("O3,Ofast")

#define EPS 1e-9
#define PI acos(-1)
#define MAXN 200005
#define MOD 1'000'000'007
#define INF 1'000'000'000'000

#define ll int64_t
#define int int32_t
#define short int16_t

#define si(n) if(scanf("%d", &n))
#define sl(n) scanf("%ld", &n);
#define sc(n) scanf("%c", &n);
#define sf(n) scanf("%f", &n);
#define slf(n) scanf("%lf", &n);

#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()
#define dbg(x) std::cerr << #x << ": " << x << std::endl;

typedef std::set<int> si;
typedef std::set<ll> sll;
typedef std::pair<int, int> pi;
typedef std::pair<ll, ll> pll;
typedef std::vector<int> vi;
typedef std::vector<ll> vll;
typedef std::vector<std::vector<int>> dvi;
typedef std::vector<std::vector<ll>> dvll;
typedef std::unordered_map<int , int> mi;
typedef std::unordered_map<ll , ll> mll;

ll gcd(ll a, ll b) {return (b == 0) ? a : gcd(b, a%b);}
ll lcm(ll a, ll b) {return a/gcd(a, b) * b;}

struct edge {
    int start, end;
    int length;
    
    bool operator <(const edge &that) const {
        return this->length < that.length;
    }
};
edge edges[MAXN];
 
struct query {
    int id;
    int start, end;
    int length;
    
    const bool operator<(const query &that) const {
        return this->length < that.length;
    }
};
query queries[MAXN];

int N, M, Q;
bool res[MAXN];
int par[MAXN], size[MAXN];

//Union Psajimo
void DSU() {
    for(int i = 0; i <= N; ++i) {
        par[i] = i;
        size[i] = 1;
    }
}

int find(int a) {
    if(a == par[a]) return a;
    return par[a] = find(par[a]);
}

void unite(int a, int b) {
    a = find(a);
    b = find(b);

    if(size[a] < size[b]) std::swap(a, b);
    par[b] = a;
    size[a] += size[b];
}

bool same(int a, int b) {
    return find(a) == find(b);
}

signed main()
{
    // freopen("file.out", "w", stdout);
    std::ios::sync_with_stdio(0);
    std::cin.tie(0);
    
    std::cin>>N>>M>>Q;
    DSU();

    for(int i = 0; i < M; ++i) {
        std::cin>>edges[i].start>>edges[i].end>>edges[i].length;
    }

    for(int i = 0; i < Q; ++i) {
        std::cin>>queries[i].start>>queries[i].end>>queries[i].length;
        queries[i].id = i;
    }

    std::sort(edges, edges + M);
    std::sort(queries, queries + Q);


    int indx = 0;
    for(int i = 0; i < Q; ++i) {
        while(edges[indx].length <= queries[i].length && indx < M) {
            unite(edges[indx].start, edges[indx].end);
            indx++;
        }

        res[queries[i].id] = same(queries[i].start, queries[i].end);
    }

    for(int i = 0; i < Q; ++i) {
        if(res[i]) std::cout<<"TAIP"<<std::endl;
        else std::cout<<"NE"<<std::endl;
    }
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 11 / 11
• Subtask 3: 11 / 11
• Subtask 4: 23 / 23
• Subtask 5: 45 / 45