oj.uz

Submission #1021900

# Submission time Handle Problem Language Result Execution time Memory
1021900 2024-07-13T07:14:25 Z guagua0407 Tug of War (BOI15_tug) C++17
41 / 100
 2502 ms 7108 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;
    }
    while(clock()-st<2.5*CLOCKS_PER_SEC){
        fill(all(vis),false);
        ord.clear();
        random_shuffle(all(ord1));
        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 2501 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 2501 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 2501 ms 440 KB Output is correct
6 Correct 2500 ms 436 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 2500 ms 436 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 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 2500 ms 440 KB Output is correct
17 Correct 0 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 0 ms 348 KB Output is correct
23 Correct 2500 ms 348 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 2500 ms 348 KB Output is correct

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2501 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 2501 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 2501 ms 440 KB Output is correct
6 Correct 2500 ms 436 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 2500 ms 436 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 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 2500 ms 440 KB Output is correct
17 Correct 0 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 0 ms 348 KB Output is correct
23 Correct 2500 ms 348 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 2500 ms 348 KB Output is correct
26 Correct 171 ms 1628 KB Output is correct
27 Correct 2501 ms 1760 KB Output is correct
28 Correct 11 ms 1628 KB Output is correct
29 Correct 2501 ms 1756 KB Output is correct
30 Correct 2502 ms 1628 KB Output is correct
31 Correct 2501 ms 1624 KB Output is correct
32 Correct 99 ms 1756 KB Output is correct
33 Correct 2501 ms 1756 KB Output is correct
34 Incorrect 2501 ms 1728 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 13 ms 7000 KB Output is correct
2 Correct 7 ms 3932 KB Output is correct
3 Correct 13 ms 7008 KB Output is correct
4 Correct 6 ms 3932 KB Output is correct
5 Correct 14 ms 7004 KB Output is correct
6 Correct 7 ms 3932 KB Output is correct
7 Correct 16 ms 7000 KB Output is correct
8 Correct 7 ms 3932 KB Output is correct
9 Correct 16 ms 7012 KB Output is correct
10 Correct 6 ms 3928 KB Output is correct
11 Correct 15 ms 7004 KB Output is correct
12 Correct 6 ms 3932 KB Output is correct
13 Correct 15 ms 7004 KB Output is correct
14 Correct 17 ms 7004 KB Output is correct
15 Correct 7 ms 3932 KB Output is correct
16 Correct 13 ms 7004 KB Output is correct
17 Correct 7 ms 3932 KB Output is correct
18 Correct 13 ms 7108 KB Output is correct
19 Correct 6 ms 3932 KB Output is correct
20 Correct 16 ms 7004 KB Output is correct
21 Correct 7 ms 3824 KB Output is correct
22 Correct 18 ms 6492 KB Output is correct

Subtask #4
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 2501 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 2501 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 2501 ms 440 KB Output is correct
6 Correct 2500 ms 436 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 2500 ms 436 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 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 2500 ms 440 KB Output is correct
17 Correct 0 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 0 ms 348 KB Output is correct
23 Correct 2500 ms 348 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 2500 ms 348 KB Output is correct
26 Correct 171 ms 1628 KB Output is correct
27 Correct 2501 ms 1760 KB Output is correct
28 Correct 11 ms 1628 KB Output is correct
29 Correct 2501 ms 1756 KB Output is correct
30 Correct 2502 ms 1628 KB Output is correct
31 Correct 2501 ms 1624 KB Output is correct
32 Correct 99 ms 1756 KB Output is correct
33 Correct 2501 ms 1756 KB Output is correct
34 Incorrect 2501 ms 1728 KB Output isn't correct
35 Halted 0 ms 0 KB -