Submission #1299773

#TimeUsernameProblemLanguageResultExecution timeMemory
1299773theiuliusObstacles for a Llama (IOI25_obstacles)C++20
Compilation error
0 ms0 KiB
#include "obstacles.h"
#include <cassert>
#include <cstdio>
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ff first
#define ss second
#define pb push_back
#define endl "\n"
int n = 0, m = 0;
const int N = 2005;
pair<int, int> parent[4][N];
int sz[4][N];
int xs[4] = {1, 1, -1, -1}, ys[4] = {1, -1, 1, -1};

pair<int, int> find_set(pair<int, int> v) {
    if (v == parent[v.ff][v.ss])
        return v;
    return parent[v.ff][v.ss] = find_set(parent[v.ff][v.ss]);
}

void make_set(pair<int, int> v) {
    parent[v.ff][v.ss] = v;
    sz[v.ff][v.ss] = 1;
}

void union_sets(pair<int, int> a, pair<int, int> b) {
    a = find_set(a);
    b = find_set(b);
    if (a != b) {
        if (sz[a.ff][a.ss] < sz[b.ff][b.ss])
            swap(a, b);
        parent[b.ff][b.ss] = a;
        sz[a.ff][a.ss] += sz[b.ff][b.ss];
    }
}


void initialize(std::vector<int> t, std::vector<int> h){
    n = t.size(); m = h.size();

    for (int i = 0; i < n; i++){
        for (int j = 0; j < m; j++){
            make_set({i, j});
        }
    }
    // t = 2, 1, 3
    int j = 0, b = 1, last_i = -1, last_j = -1;
    for (int i = 0; i < n; i++){
        while (j < m && j >= 0){
            if (t[i] > h[j]){
                for (int k = 0; k < 4; k++){
                    int i1 = i + xs[k], j1 = j + ys[k];
                    if (i1 < 0 || i1 > n || j1 < 0 || j1 > m || t[i1] > h[j1]){
                        continue;
                    }
                    union_sets({i1, j1}, {i, j});
                }
                
            }

            j += b;
        }
        j -= b;
        b = -b;
    }
}

bool can_reach(int l, int r, int s, int d){
    if (find_set({0, s}) == find_set({0, d})){
        return 1;
    }
    return 0;
}


int main() {
    int N, M;
    assert(2 == scanf("%d %d", &N, &M));
    std::vector<int> T(N), H(M);
    for (int i = 0; i < N; i++)
        assert(1 == scanf("%d", &T[i]));
    for (int i = 0; i < M; i++)
        assert(1 == scanf("%d", &H[i]));

    int Q;
    assert(1 == scanf("%d", &Q));
    std::vector<int> L(Q), R(Q), S(Q), D(Q);
    for (int i = 0; i < Q; i++)
        assert(4 == scanf("%d %d %d %d", &L[i], &R[i], &S[i], &D[i]));

    fclose(stdin);

    std::vector<bool> A(Q);

    initialize(T, H);

    for (int i = 0; i < Q; i++)
        A[i] = can_reach(L[i], R[i], S[i], D[i]);

    for (int i = 0; i < Q; i++)
        if (A[i])
        printf("1\n");
        else
        printf("0\n");
    fclose(stdout);

    return 0;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccWAbPyZ.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc38HWrv.o:obstacles.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status