Submission #1207640

#	Time	Username	Problem	Language	Result	Execution time	Memory
1207640		raphaelp	Mechanical Doll (IOI18_doll)	C++20	Compilation error	0 ms	0 KiB

doll

#include "doll.h"
#include <bits/stdc++.h>
using namespace std;
int rev(int x)
{
    int ans = 0;
    while (x)
    {
        ans *= 2;
        ans += x % 2;
        x /= 2;
    }
    return ans;
}
void create_circuit(int M, vector<int> A)
{
    int N = A.size();
    vector<vector<int>> exits(M + 1);
    exits[0].push_back(A[0]);
    for (int i = 0; i < N - 1; i++)
        exits[A[i]].push_back(A[i + 1]);
    exits[A.back()].push_back(0);
    vector<int> X, Y, C(M + 1);
    for (int i = 0; i <= M; i++)
    {
        int last = X.size();
        int x = exits[i].size();
        if (x == 0)
        {
            C[i] = 0;
            continue;
        }
        C[i] = exits[i][0];
        if (x == 1)
            continue;
        C[i] = -last - 1;
        for (int j = 0; j < x - 1; j++)
        {
            X.push_back(M + 1);
            Y.push_back(M + 1);
            if (j * 2 + 1 < x - 1)
                X[j] = -(last + j * 2 + 1) - 1;
            else
                X[j] = exits[i][rev(j)];
            if (j * 2 + 2 < x - 1)
                Y[j] = -(last + j * 2 + 2) - 1;
            else
                Y[j] = exits[i][rev(2 * j + 1)];
        }
    }
    return (C, X, Y);
}

Compilation message (stderr)

doll.cpp: In function 'void create_circuit(int, std::vector<int>)':
doll.cpp:51:17: error: return-statement with a value, in function returning 'void' [-fpermissive]
   51 |     return (C, X, Y);
      |            ~~~~~^~~~