Submission #1107959

#	Time	Username	Problem	Language	Result	Execution time	Memory
1107959		sleepntsheep	Message (IOI24_message)	C++17	Compilation error	0 ms	0 KiB

message

#include "message.h"

void send_message(std::vector<bool> M, std::vector<bool> C) {
    int d[16] = { 0 }, g[16] = { 0 }, z = 0, buf[2000], y = 0;
    for (int j = 0, i = 0; i < 31; ++i) if (!C[i]) g[j++] = i;
    for (int i = 0; i < 15; ++i) d[i] = g[i + 1] - g[i];
    d[15] = 32 - g[15] + g[0];

    for (int i = 0; i < 10; ++i) buf[y++] = ((int)M.size() >> i) & 1;
    for (int x : M) buf[y++] = x;

    for (int i = 0; i < 67; ++i) {
	std::vector<bool> p(31);
	for (int k = 0, ii; k < 16; ++k) {
	    ii = g[k];
	    if (i + 1 == d[k])
		p[ii] = 1;
	    else if (i + 1 < d[k])
		p[ii] = 0;
	    else
		p[ii] = buf[z++];
	}
	send_packet(p);
    }
}

std::vector<int> g[31];
int head, tail, par[31], vis[31];

int cycle(int u, int p) {
    vis[u] = 1;
    par[u] = p;
    for (int v : g[u]) {
	if (!vis[v]) {
	    if (cycle(v, u)) return 1;
	} else {
	    head = u; tail = v;
	    return 1;
	}
    }
    return 0;
}

std::vector<bool> receive_message(std::vector<std::vector<bool>> R) {
    int d[31] = { 0 }, g[16], e[31] = { 0 }, S = 0, z = 0, buf[2000];
    for (int i = 0; i < 31; ++i) vis[i] = 1;
    for (int i = 0; i < 67; ++i) {
	for (int j = 0; j < 31; ++j) {
	    if (!d[j] && R[i][j] == 1) {
		d[j] = (j + i + 1) % 31;
		g[j].push_back(d[j]);
		g[d[j]].push_back(j);
	    }
	}
    }
    
    for (int i = 0, p = 0; i < 31; ++i) if (!vis[i] && cycle(i, i)) {
	for (int c = head; c != tail; c = par[c]) g[p++] = c;
	g[p++] = tail;
    }

    for (int i = 0; i < 16; ++i) e[g[i]] = -1;

    for (int i = 0; i < 67; ++i) {
	for (int j = 0; j < 31; ++j) {
	    if (e[j] && d[j] <= i) {
		buf[z++] = R[i][j];
	    }
	}
    }

    for (int i = 0; i < 10; ++i) S |= buf[z++] << i;

    std::vector<bool> M(S);
    for (int &x : M) x = buf[z++];
    return M;
}

Compilation message (stderr)

message.cpp: In function 'std::vector<bool> receive_message(std::vector<std::vector<bool> >)':
message.cpp:51:8: error: request for member 'push_back' in 'g[j]', which is of non-class type 'int'
   51 |   g[j].push_back(d[j]);
      |        ^~~~~~~~~
message.cpp:52:11: error: request for member 'push_back' in 'g[d[j]]', which is of non-class type 'int'
   52 |   g[d[j]].push_back(j);
      |           ^~~~~~~~~
message.cpp:75:19: error: cannot bind non-const lvalue reference of type 'int&' to an rvalue of type 'int'
   75 |     for (int &x : M) x = buf[z++];
      |                   ^
In file included from /usr/include/c++/10/vector:68,
                 from message.h:1,
                 from message.cpp:1:
/usr/include/c++/10/bits/stl_bvector.h:86:5: note:   after user-defined conversion: 'std::_Bit_reference::operator bool() const'
   86 |     operator bool() const _GLIBCXX_NOEXCEPT
      |     ^~~~~~~~