oj.uz

Submission #1021904

# Submission time Handle Problem Language Result Execution time Memory
1021904 2024-07-13T07:16:11 Z guagua0407 Tug of War (BOI15_tug) C++17
41 / 100
 2902 ms 6888 KB 
#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

vector<vector<int>> adj,adjr;
vector<bool> vis;
vector<int> ord;
vector<int> scc;

void dfs(int v){
    vis[v]=true;
    for(auto u:adj[v]){
        if(vis[u]) continue;
        dfs(u);
    }
    ord.push_back(v);
}

void dfs2(int v,int id){
    scc[v]=id;
    vis[v]=true;
    for(auto u:adjr[v]){
        if(vis[u]) continue;
        dfs2(u,id);
    }
}

void addedge(int a,int b){
    adj[a].push_back(b);
    adjr[b].push_back(a);
}

int main() {_
    auto st=clock();
    int n,k;
    cin>>n>>k;
    vector<int> l(2*n),r(2*n),S(2*n);
    int all=0;
    vector<vector<int>> ls(n),rs(n);
    for(int i=0;i<2*n;i++){
        cin>>l[i]>>r[i]>>S[i];
        l[i]--;
        r[i]--;
        ls[l[i]].push_back(i);
        rs[r[i]].push_back(i);
        all+=S[i];
    }
    adj.resize(4*n),adjr.resize(4*n);
    vis.resize(4*n);
    scc.resize(4*n);
    for(int i=0;i<n;i++){
        if(ls[i].empty() or rs[i].empty()){
            cout<<"NO"<<'\n';
            return 0;
        }
        for(auto a:ls[i]){
            for(auto b:ls[i]){
                if(a!=b){
                    addedge(2*a,2*b+1);
                }
            }
        }
        for(auto a:rs[i]){
            for(auto b:rs[i]){
                if(a!=b){
                    addedge(2*a+1,2*b);
                }
            }
        }
    }
    vector<int> ord1(4*n);
    for(int i=0;i<4*n;i++){
        ord1[i]=i;
    }
    mt19937 rng(time(NULL));
    while(clock()-st<2.9*CLOCKS_PER_SEC){
        fill(all(vis),false);
        ord.clear();
        shuffle(all(ord1),rng);
        for(int i=0;i<4*n;i++){
            if(!vis[ord1[i]]){
                dfs(ord1[i]);
            }
        }
        reverse(all(ord));
        fill(all(vis),false);
        int cnt=0;
        for(int i=0;i<4*n;i++){
            if(!vis[ord[i]]){
                dfs2(ord[i],cnt++);
            }
        }
        int sum=0;
        for(int i=0;i<2*n;i++){
            if(scc[i*2]==scc[i*2+1]){
                cout<<"NO"<<'\n';
                return 0;
            }
            else{
                if(scc[i*2]<scc[i*2+1]){
                    sum+=S[i];
                }
            }
        }
        if(abs(sum-(all-sum))<=k){
            cout<<"YES"<<'\n';
            return 0;
        }
    }
    cout<<"NO"<<'\n';
    return 0;
}
//maybe its multiset not set
//yeeorz
//laborz

Compilation message

tug.cpp: In function 'void setIO(std::string)':
tug.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tug.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2900 ms 440 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 2900 ms 440 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 2900 ms 436 KB Output is correct
6 Correct 2900 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 2900 ms 436 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 600 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 2900 ms 436 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 2900 ms 440 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 2900 ms 436 KB Output is correct

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2900 ms 440 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 2900 ms 440 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 2900 ms 436 KB Output is correct
6 Correct 2900 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 2900 ms 436 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 600 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 2900 ms 436 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 2900 ms 440 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 2900 ms 436 KB Output is correct
26 Correct 26 ms 1624 KB Output is correct
27 Correct 2902 ms 1716 KB Output is correct
28 Correct 308 ms 1624 KB Output is correct
29 Correct 2901 ms 1712 KB Output is correct
30 Correct 2901 ms 1628 KB Output is correct
31 Correct 2901 ms 1628 KB Output is correct
32 Correct 112 ms 1628 KB Output is correct
33 Correct 2901 ms 1720 KB Output is correct
34 Incorrect 2901 ms 1696 KB Output isn't correct
35 Halted 0 ms 0 KB -

Subtask #3
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 6744 KB Output is correct
2 Correct 7 ms 3820 KB Output is correct
3 Correct 17 ms 6748 KB Output is correct
4 Correct 9 ms 3676 KB Output is correct
5 Correct 15 ms 6748 KB Output is correct
6 Correct 7 ms 3676 KB Output is correct
7 Correct 16 ms 6748 KB Output is correct
8 Correct 6 ms 3696 KB Output is correct
9 Correct 20 ms 6784 KB Output is correct
10 Correct 9 ms 3796 KB Output is correct
11 Correct 11 ms 6800 KB Output is correct
12 Correct 6 ms 3676 KB Output is correct
13 Correct 14 ms 6888 KB Output is correct
14 Correct 16 ms 6744 KB Output is correct
15 Correct 10 ms 3676 KB Output is correct
16 Correct 13 ms 6772 KB Output is correct
17 Correct 6 ms 3676 KB Output is correct
18 Correct 12 ms 6748 KB Output is correct
19 Correct 8 ms 3676 KB Output is correct
20 Correct 14 ms 6740 KB Output is correct
21 Correct 6 ms 3676 KB Output is correct
22 Correct 14 ms 6336 KB Output is correct

Subtask #4
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 2900 ms 440 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 2900 ms 440 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 2900 ms 436 KB Output is correct
6 Correct 2900 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 2900 ms 436 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 600 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 2900 ms 436 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 2900 ms 440 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 2900 ms 436 KB Output is correct
26 Correct 26 ms 1624 KB Output is correct
27 Correct 2902 ms 1716 KB Output is correct
28 Correct 308 ms 1624 KB Output is correct
29 Correct 2901 ms 1712 KB Output is correct
30 Correct 2901 ms 1628 KB Output is correct
31 Correct 2901 ms 1628 KB Output is correct
32 Correct 112 ms 1628 KB Output is correct
33 Correct 2901 ms 1720 KB Output is correct
34 Incorrect 2901 ms 1696 KB Output isn't correct
35 Halted 0 ms 0 KB -