oj.uz

답안 #601161

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
601161 2022-07-21T12:14:52 Z TimDee Stranded Far From Home (BOI22_island) C++17
20 / 100
 407 ms 36548 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define paiu return
#define moment 0;
 
#define int long long
#define double long double
#define ll long long

#define forr(i,x) for (int i=0; i<x; i++)
#define forn(i,x) for (int i=0; i<x; i++)

#define vi(a,n) vector<int> a(n,0)
 
//cringe define
#define vii(a,n) vi(a,n); forr(i,n) cin>>a[i];
vector<int> ___makeprefsum(vector<int>&a) {
    int n=a.size();
    vi(pr,n+1);
    forn(i,n) pr[i+1]=pr[i]+a[i];
    return pr;
}
#define prefsum(pr,a) vector<int> pr=___makeprefsum(a);
 
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
 
#define pb(x) push_back(x)
#define pf pop_front();
#define last(c) c[c.size()-1]
 
#define f first
#define s second
 
#define pi pair<int, int>
#define mp(x,y) make_pair(x, y)
 
const ll mod = 1000000007;
const double ppi = acos(0) * 2;
     
const int maxn = 1e5+1;
const int inf = INT_MAX;
const ll linf = LLONG_MAX;
const ll mmod = 998244353;

vector<int> a;
vector<vector<int>> adj(2e5);
auto cmp = [](int i, int j) { return a[i]<=a[j]; };

void subtask1(int n, int m) {

    string ans(n,'1');

    forn(i,n) {
        set<int,decltype(cmp)> s(cmp);
        int cnt=a[i];
        bitset<2000> vis; vis.set(i,1); //cout<<i+1<<"->";
        for (auto v:adj[i]) { s.insert(v); vis.set(v,1); }
        while (!s.empty()) {
            auto it=s.begin();
            int u=*it;
            //cout<<u+1<<"->";
            if (a[u]>cnt) {ans[i]='0'; break;}
            cnt+=a[u]; 
            vis.set(u,1);
            s.erase(it);
            for (auto v:adj[u]) if (!vis[v]) { s.insert(v); vis.set(v,1); }
        }
        //cout<<'\n';
    }
    cout<<ans<<'\n';
}

void dfs(vector<vector<int>>&adj, vector<int>&vis, vector<int>&d, int v) {
    if (vis[v]) return;
    vis[v]=1;
    d[v]+=a[v]; //cout<<v<<' '<<d[v]<<' '<<a[v]<<'\n';
    for (auto u:adj[v]) {
        dfs(adj,vis,d,u);
        if (u>v) d[v]+=d[u];
    }
}

void ver(vector<vector<int>>&adj, vector<int>&vis, vector<int>&d, vector<int>&up, int v) {
    if (vis[v]) return;
    vis[v]=1;
    for (auto u:adj[v]) {
        if (u<v) continue;
        if (d[u]>=a[v]) {
            up[u]=1;
            ver(adj,vis,d,up,u);
        }
    }
}

void subtask2(int n, int m) {
    vector<int> up(n,0);
    vector<int> d(n,0), vis(n,0);
    dfs(adj,vis,d,0);
    //forn(i,n) cout<<d[i]<<' '; cout<<'\n';
    up[0]=1;
    vis.assign(n,0);
    ver(adj,vis,d,up,0);
    forn(i,n) cout<<up[i]; cout<<'\n';
}

int n;  // array size
vector<int> t;

int merge(int i, int j) {
    if (a[i]<=a[j]) return i;
    else return j;
}

void build(int _n) {  // build the tree
    a.push_back(linf);
    n=_n;
  for (int i = n - 1; i > 0; --i) t[i] = merge ( t[i<<1] , t[i<<1|1] );
}

void modify(int p, int value) {  // set value at position p
  for (t[p += n] = value; p > 1; p >>= 1) t[p>>1] = merge( t[p] , t[p^1] );
}

void subtask3(int n, int m) {
    string ans(n,'1');
    set<int> left;
    forn(i,n) left.insert(i);
    t.assign(2*n,n);
    forn(i,n) t[n+i]=i;
    build(n);
    int unvis=n;
    vector<int> d(n,0), vis(n,0);
    forn(i,n) d[i]=a[i];
    while (unvis) {
        int u=t[1]; --unvis;
        left.erase(left.find(u));
        vector<int> path = {u};
        auto it1=left.upper_bound(u), it2=left.upper_bound(u);
        d.push_back(linf);
        int l=n,r=n;
        if (it1!=left.begin()) {--it1; 
            l=*it1; 
        }
        if (it2!=left.end()) {
            r=*it2;
        }

        while (l!=n || r!=n) {
            int v;
            if (d[l]<=d[r]) v=l;
            else v=r;
            if (d[u]>=d[v]) {
                left.erase(left.find(v));
                if (v<u) {
                    auto it1=left.upper_bound(u);
                    if (it1!=left.begin()) {
                        --it1; 
                        l=*it1; 
                    } else l=n;
                } else {
                    auto it2=left.upper_bound(u);
                    if (it2!=left.end()) {
                        r=*it2;
                    } else r=n;
                }
                u=v;
                --unvis;
            } else {
                for (auto x:path) { ans[x]='0'; modify(x,n); }
                d[v]+=d[u];
                break;
            }
            d[v]+=d[u];
            path.pb(v);
        }

    }
    cout<<ans;
}

void solve() {
    
    int n,m; cin>>n>>m;
    vii(b,n); a=b;
    int _p3=1, _p2=1;
    vector<int> lesscnt(n,0);

    forn(i,m) {
        int u,v; cin>>u>>v;
        --u, --v;
        if (u>v) swap(u,v);
        adj[u].pb(v);
        adj[v].pb(u);
        _p3&=(abs(u-v)==1);
        lesscnt[max(u,v)]++;
    }

    forn(i,n) _p2&=(i==0 || (lesscnt[i]==1));

    if (n<=2000 && m<=2000) {
        subtask1(n,m);
        return;
    } 
    forn(i,n-1) _p2&=(a[i]>=a[i+1]);
    if (_p2) {
        subtask2(n,m);
        return;
    }
    if (_p3) {
        subtask3(n,m);
        return;
    }
}

int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    
    int t=1;
    //cin>>t;
    while(t--) solve();
    
    paiu moment
}

Compilation message

island.cpp: In function 'void subtask2(long long int, long long int)':
island.cpp:12:19: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   12 | #define forn(i,x) for (int i=0; i<x; i++)
      |                   ^~~
island.cpp:105:5: note: in expansion of macro 'forn'
  105 |     forn(i,n) cout<<up[i]; cout<<'\n';
      |     ^~~~
island.cpp:105:28: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  105 |     forn(i,n) cout<<up[i]; cout<<'\n';
      |                            ^~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 214 ms 5136 KB Output is correct
5 Correct 218 ms 5076 KB Output is correct
6 Correct 293 ms 5132 KB Output is correct
7 Correct 212 ms 5136 KB Output is correct
8 Correct 151 ms 5120 KB Output is correct
9 Correct 407 ms 5076 KB Output is correct
10 Correct 95 ms 5124 KB Output is correct
11 Correct 96 ms 5076 KB Output is correct
12 Correct 115 ms 5156 KB Output is correct
13 Correct 167 ms 5128 KB Output is correct
14 Correct 109 ms 5132 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 210 ms 28080 KB Output is correct
4 Correct 159 ms 28192 KB Output is correct
5 Correct 189 ms 21300 KB Output is correct
6 Correct 213 ms 21944 KB Output is correct
7 Correct 210 ms 21992 KB Output is correct
8 Correct 193 ms 21912 KB Output is correct
9 Correct 150 ms 23092 KB Output is correct
10 Correct 130 ms 22332 KB Output is correct
11 Correct 118 ms 22332 KB Output is correct
12 Correct 195 ms 21924 KB Output is correct
13 Correct 145 ms 36548 KB Output is correct
14 Correct 150 ms 36468 KB Output is correct
15 Correct 188 ms 36412 KB Output is correct
16 Correct 95 ms 36116 KB Output is correct

Subtask #3
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Incorrect 289 ms 34128 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Incorrect 142 ms 16856 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 214 ms 5136 KB Output is correct
5 Correct 218 ms 5076 KB Output is correct
6 Correct 293 ms 5132 KB Output is correct
7 Correct 212 ms 5136 KB Output is correct
8 Correct 151 ms 5120 KB Output is correct
9 Correct 407 ms 5076 KB Output is correct
10 Correct 95 ms 5124 KB Output is correct
11 Correct 96 ms 5076 KB Output is correct
12 Correct 115 ms 5156 KB Output is correct
13 Correct 167 ms 5128 KB Output is correct
14 Correct 109 ms 5132 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 2 ms 4948 KB Output is correct
17 Correct 210 ms 28080 KB Output is correct
18 Correct 159 ms 28192 KB Output is correct
19 Correct 189 ms 21300 KB Output is correct
20 Correct 213 ms 21944 KB Output is correct
21 Correct 210 ms 21992 KB Output is correct
22 Correct 193 ms 21912 KB Output is correct
23 Correct 150 ms 23092 KB Output is correct
24 Correct 130 ms 22332 KB Output is correct
25 Correct 118 ms 22332 KB Output is correct
26 Correct 195 ms 21924 KB Output is correct
27 Correct 145 ms 36548 KB Output is correct
28 Correct 150 ms 36468 KB Output is correct
29 Correct 188 ms 36412 KB Output is correct
30 Correct 95 ms 36116 KB Output is correct
31 Correct 3 ms 4948 KB Output is correct
32 Incorrect 289 ms 34128 KB Output isn't correct
33 Halted 0 ms 0 KB -