Submission #1078155

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
1078155	2024-08-27T13:25:06 Z	hung_nm	Pipes (BOI13_pipes)	C++17	Compilation error	0 ms	0 KB

pipes

#include <bits/stdc++.h>
#define pb push_back
#define fi first
#define se second
#define pii pair<int, int>
#define pipii pair<int, pair<int, int>>
#define vi vector<int>
#define vpi vector<pair<int, int>>
#define inp(name) if(fopen(name, "r")) freopen(name, "r", stdin);
#define out(name) if(fopen(name, "w")) freopen(name, "w", stdout);
#define int long long
const int N = 1e6 + 5;
const int mod = 1e9 + 7;
using namespace std;

long long n, m, c[N], ans[N];
vpi ad[N];

void dfs(int u, int p, int id = 0)
{
    long long res = 0;
    for (auto [v, pos] : ad[u])
    {
        if (v == p) continue;
        dfs(v, u, pos);
        res += ans[pos];
    }
    ans[id] = c[u] - res;
}

void sub1()
{
    dfs(1, 0);
    for (int i = 1; i <= m; ++i)
    {
        cout << 2 * ans[i] << "\n";
    }
}

long long del[N], deg[N], ok[N], tmp, x, root, root2, index;
queue<int> q;

void dfs2(int u, int p, int dau)
{
    ok[u] = 1;
    tmp = tmp + dau * c[u];
    for (auto [v, i] : ad[u])
    {
        if (v == p || del[v])
        {
            continue;
        }
        if(ok[v] == 0)
        {
            dfs2(v, u, dau * (-1));
            if (x != 0)
            {
                return;
            }
        }
        else
        {
            ans[index] = tmp;
            return ;
        }
    }
}

void dfs3(int u, int p, int pre)
{
    ok[u] = 1;
    for (auto [v, i] : ad[u])
    {
        if (v == p || del[v] || ok[v]) continue;
        ans[i] = 2 * c[u] - ans[pre];
        dfs3(v, u, i);
    }
}

void sub2()
{
    for (int i = 1; i <= n; ++i)
    {
        if (deg[i] == 1)
        {
            q.push(i);
            del[i] = 1;
        }
    }

    while (!q.empty())
    {
        int u = q.front(); q.pop();
        del[u] = 1;
        for (auto [v, i] : ad[u])
        {
            if (del[v]) continue;
            ans[i] = 2 * c[u];
            c[v] -= c[u];
            deg[v]--;
            if (deg[v] == 1)
            {
                q.push(v);
            }
        }
    }
    long long cnt = 0;
    for(int i = 1; i <= n; ++i)
    {
        if(!del[i])
        {
            root = i;
            cnt++;
        }
    }

    if(cnt % 2 == 0)
    {
        cout << 0;
        return ;
    }


    for(auto [x, i] : ad[root])
    {
        if(del[x]) continue ;
        root2 = x;
        index = i;
        break ;
    }

    ok[root] = 1;
    dfs2(root, root2, 1);
    memset(ok, 0, sizeof(ok));
    dfs3(root, root2, index);
    for (int i = 1; i <= m; ++i)
    {
        cout << ans[i] << "\n";
    }
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(0);
    cin >> n >> m;
    for (int i = 1; i <= n; ++i)
    {
        cin >> c[i];
    }

    for (int i = 1; i <= m; ++i)
    {
        int u, v;
        cin >> u >> v;
        ad[u].pb({v, i});
        ad[v].pb({u, i});
        deg[u]++;
        deg[v]++;
    }

    if (m > n)
    {
        cout << 0;
        return 0;
    }

    if (m == (n - 1))
    {
        sub1();
        return 0;
    }

    sub2();
    return 0;
}

Compilation message

pipes.cpp:40:55: error: 'long long int index' redeclared as different kind of entity
   40 | long long del[N], deg[N], ok[N], tmp, x, root, root2, index;
      |                                                       ^~~~~
In file included from /usr/include/string.h:432,
                 from /usr/include/c++/10/cstring:42,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:48,
                 from pipes.cpp:1:
/usr/include/strings.h:61:1: note: previous declaration 'const char* index(const char*, int)'
   61 | index (const char *__s, int __c) __THROW
      | ^~~~~
pipes.cpp: In function 'void dfs2(long long int, long long int, long long int)':
pipes.cpp:63:16: error: invalid types 'long long int [1000005][<unresolved overloaded function type>]' for array subscript
   63 |             ans[index] = tmp;
      |                ^
pipes.cpp: In function 'void sub2()':
pipes.cpp:128:17: error: overloaded function with no contextual type information
  128 |         index = i;
      |                 ^
pipes.cpp:135:28: error: cannot resolve overloaded function 'index' based on conversion to type 'long long int'
  135 |     dfs3(root, root2, index);
      |                            ^