Submission #714695

#	Time	Username	Problem	Language	Result	Execution time	Memory
714695		Toxtaq	Stranded Far From Home (BOI22_island)	C++17	10 / 100	1087 ms	36784 KiB

island

#include <bits/stdc++.h>
using namespace std;
/*
7 6
4 2 20 6 8 2 22
1 2
2 3
3 6
1 4
4 5
5 7
*/
vector<vector<int>>g;
vector<int>num;
vector<bool>vis, chosen;
bool cmp(int a, int b){
    return num[a] < num[b];
}
long long cnt = 0;
vector<int>tmp;
void dfs(int u){
    vis[u] = 1;
//    cout << u << " ";
    vector<int>tempo;
    for(int v : g[u]){
        if(!chosen[v] && cnt >= num[v]){
            cnt += num[v];
            chosen[v] = 1;
            tempo.push_back(v);
        }
        else if(cnt < num[v]){
            tmp.push_back(v);
        }
    }
    for(int v : tempo){
        if(!vis[v]){
            dfs(v);
        }
    }
}
int main()
{
    int n, m;
    cin >> n >> m;
    g.resize(n + 1);
    num.resize(n + 1);
    vis.resize(n + 1);
    chosen.resize(n + 1);
    for(int i = 1;i <= n;++i)cin >> num[i];
    for(int i = 0;i < m;++i){
        int u, v;
        cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    for(int i = 1;i <= n;++i){
        sort(g[i].begin(), g[i].end(), cmp);
    }
//    for(int i = 1;i <= n;++i){
//        cout << i << ": ";
//        for(int j : g[i]){
//            cout << j << " ";
//        }
//        cout << '\n';
//    }
    string s = "";
    for(int i = 1;i <= n;++i){
//        cout << i << ": ";
        cnt = num[i];
        chosen[i] = 1;
        dfs(i);
        sort(tmp.begin(), tmp.end(), cmp);
        int ind = 0;
        while(tmp.size() && ind < tmp.size()){
            int j = tmp[ind], sz = tmp.size();
            if(!chosen[j] && cnt >= num[j]){
                chosen[j] = 1;
                cnt += num[j];
                dfs(j);
            }
            else{
                ind++;
                continue;
            }
            sort(tmp.begin(), tmp.end(), cmp);
            ind = 0;
        }
//        cout << "CNT: " << cnt << '\n';
        bool ok = 1;
        for(int j = 1;j <= n && ok;++j){
            if(!vis[j]){
                ok = 0;
            }
        }
        for(int j = 1;j <= n;++j){
            vis[j] = 0;
            chosen[j] = 0;
        }
        if(ok)s += '1';
        else s += '0';
        tmp.clear();
    }
    cout << s;
}

Compilation message (stderr)

island.cpp: In function 'int main()':
island.cpp:74:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |         while(tmp.size() && ind < tmp.size()){
      |                             ~~~~^~~~~~~~~~~~
island.cpp:75:31: warning: unused variable 'sz' [-Wunused-variable]
   75 |             int j = tmp[ind], sz = tmp.size();
      |                               ^~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 35