Submission #1182857

#	Time	Username	Problem	Language	Result	Execution time	Memory
1182857		waigoon	Drivers (BOI24_drivers)	C++20	0 / 100	1 ms	2116 KiB

Main

#include <bits/stdc++.h>
#define int long long
#define float long double
#define pii pair<int, int>
#define f first
#define s second
#define tiii tuple<int, int, int>
#define ve vector
#define emb emplace_back
#define em emplace

using namespace std;

int dx[] = {1, 0, -1, 0};
int dy[] = {0, 1, 0, -1};

const int inf = 1e14;
const int mod = 1e9 + 7;

void io(string name);

int par[200000];

int fp(int x) {
    if (par[x] == -1) return x;
    return par[x] = fp(par[x]);
}

int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    int n, m, u;
    cin >> n >> m >> u;
    ve<tiii> edges;
    while (m--) {
        int a, b, c;
        cin >> a >> b >> c;
        a--, b--;
        edges.emb(c, a, b);
    }
    ve<tuple<int, int, int, int>> q;
    for (int i = 0; i < u; i++) {
        int a, b, c;
        cin >> a >> b >> c;
        a--, b--;
        q.emb(c, a, b, i);
    }
    ve<pii> ans;
    sort(q.begin(), q.end());
    sort(edges.begin(), edges.end());
    memset(par, -1, sizeof(par));
    int pt = 0;
    for (auto &[x, y, z, idx] : q) {
        while (x > get<0>(edges[pt]) && pt < edges.size()) {
            auto [w, xx, yy] = edges[pt];
            int px = fp(xx), py = fp(yy);
            if (px != py) par[px] = py;
            pt++;
        }
        if (fp(y) == fp(z)) ans.emb(idx, 1);
        else ans.emb(idx, 0);
    }
    sort(ans.begin(), ans.end());
    for (auto &[x, y] : ans) cout << (y ? "TAIP" : "NE") << '\n';
    return 0;
}

void io(string name) {
	freopen((name + ".in").c_str(), "r", stdin);
	freopen((name + ".out").c_str(), "w", stdout);
}

Compilation message (stderr)

Main.cpp: In function 'void io(std::string)':
Main.cpp:68:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |         freopen((name + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:69:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |         freopen((name + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 11
• Subtask 3: 0 / 11
• Subtask 4: 0 / 23
• Subtask 5: 0 / 45