Submission #1231639

#	Time	Username	Problem	Language	Result	Execution time	Memory
1231639		nguyenkhangninh99	Dreaming (IOI13_dreaming)	C++20	Compilation error	0 ms	0 KiB

dreaming

#include "dreaming.h"
#include <bits/stdc++.h>
using namespace std;
#define FOR(i, a, b) for(int i = a; i <= b; i++)
inline bool maximize(int &u, int v){
    return v > u ? u = v, true : false;
}
inline bool minimize(int &u, int v){
    return v < u ? u = v, true : false;
}

const int maxN = 1e5 + 5;

int n, m, l;
vector<pair<int, int>> adj[maxN];
int cnt;
bool visited[maxN];
int mx1[maxN], out[maxN], mx2[maxN];
int root[maxN], sz[maxN];
int maxBranch[maxN];
int find_root(int v){
    return root[v] = root[v] == v ? v : find_root(root[v]);
}
bool union_set(int u, int v){
    u = find_root(u);
    v = find_root(v);
    if(u == v) return false;
    if(sz[u] < sz[v])swap(u, v);
    sz[u] += sz[v];
    root[v] = u;
    return true;
}
void dfs(int u){
    visited[u] = true;
//    cout << u << "\n";
    for(auto[v, w] : adj[u]){
        if(visited[v])continue;
        dfs(v);
        if(mx1[v] + w > mx1[u]){
            mx2[u] = mx1[u];
            mx1[u] = mx1[v] + w;
        }else maximize(mx2[u], mx1[v] + w);
    }
}
void dfs2(int u){
    visited[u] = true;
    for(auto[v, w] : adj[u]){
        if(visited[v])continue;
        out[v] = out[u] + w;
        if(mx1[v] + w == mx1[u])maximize(out[v], mx2[u] + w);
        else maximize(out[v], mx1[u] + w);
        dfs2(v);
    }
}

int travelTime(int N, int M, int L, int A[], int B[], int T[]){
    n = N;
    m = M;
    l = L;
    FOR(i, 0, n - 1)root[i] = i, sz[i] = 1;
    FOR(i, 0, m - 1){
        int u = A[i];
        int v = B[i];
        int w = T[i];
        adj[u].emplace_back(v, w);
        adj[v].emplace_back(u, w);
        union_set(u, v);
    }
    FOR(i, 0, n - 1){
        if(!visited[i]){
            dfs(i);
        }
    }
    FOR(i, 0, n - 1)visited[i] = false;
    FOR(i, 0, n - 1){
        if(!visited[i]){
            dfs2(i);
        }
    }
    int ans = 0;
    FOR(i, 0, n - 1){
        maximize(ans, max(mx1[i] + mx2[i], mx1[i] + out[i]));
    }
    vector<int> res;
    FOR(i, 0, n - 1)maxBranch[i] = inf;
    FOR(i, 0, n - 1)minimize(maxBranch[find_root(i)], max(mx1[i], out[i]));
    FOR(i, 0, n - 1)if(i == find_root(i))res.emplace_back(maxBranch[i]);
    sort(res.begin(), res.end());
    reverse(res.begin(), res.end());
    if(res.size() == 1){
        return ans;
    }else if(res.size() == 2){
        return max(ans, res[0] + res[1] + l);
    }else{
        ans = max(ans, res[0] + res[1] + l);
        ans = max(ans, res[1] + res[2] + 2 *  l);
        return ans;
    }
}

Compilation message (stderr)

dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:86:36: error: 'inf' was not declared in this scope; did you mean 'ynf'?
   86 |     FOR(i, 0, n - 1)maxBranch[i] = inf;
      |                                    ^~~
      |                                    ynf