Submission #719964

#	Time	Username	Problem	Language	Result	Execution time	Memory
719964		walterw	Chameleon's Love (JOI20_chameleon)	C++17	40 / 100	18 ms	804 KiB

chameleon

#include "chameleon.h"
#include <bits/stdc++.h>

namespace {

int variable_example = 1;

}

using namespace std;

int n;
vector<int> adj[10005];
int oneway[10005];
vector<int> leftovers[10005];

bool answered[10005];

void Solve(int N) {
    n = N;

    for (int i = 1; i <= 2 * n; i++) {
        for (int j = 1; j <= 2 * n; j++) {
            if (i == j) continue;
            vector<int> temp = {i, j};
            int res = Query(temp);

            if (res == 1) {
                // an edge
                adj[i].push_back(j);
            }
        }

        if (adj[i].size() == 1) {
            // mutual love case
            if (answered[i] || answered[adj[i][0]]) continue;
            Answer(i, adj[i][0]);
            answered[i] = answered[adj[i][0]] = true;
        } else {
            assert(adj[i].size() == 3);

            int q1 = Query({i, adj[i][0], adj[i][1]});
            int q2 = Query({i, adj[i][0], adj[i][2]});
            int q3 = Query({i, adj[i][1], adj[i][2]});

            if (q1 == 1) {
                oneway[i] = adj[i][2];
                leftovers[i] = {adj[i][0], adj[i][1]};
            } else if (q2 == 1) {
                oneway[i] = adj[i][1];
                leftovers[i] = {adj[i][0], adj[i][2]};
            } else {
                oneway[i] = adj[i][0];
                leftovers[i] = {adj[i][1], adj[i][2]};
            }
        }
    }

    for (int i = 1; i <= 2 * n; i++) {
        if (answered[i]) continue;
        if (adj[i].size() == 1) continue;
        if (oneway[leftovers[i][0]] == i) {
            Answer(i, leftovers[i][1]);
            answered[i] = answered[leftovers[i][1]] =true;
        } else {
            Answer(i, leftovers[i][0]);
            answered[i] = answered[leftovers[i][0]] =true;
        }
    }
}

Compilation message (stderr)

chameleon.cpp: In function 'void Solve(int)':
chameleon.cpp:44:17: warning: unused variable 'q3' [-Wunused-variable]
   44 |             int q3 = Query({i, adj[i][1], adj[i][2]});
      |                 ^~
chameleon.cpp: At global scope:
chameleon.cpp:6:5: warning: '{anonymous}::variable_example' defined but not used [-Wunused-variable]
    6 | int variable_example = 1;
      |     ^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 4
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36