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Submission #753308

# Submission time Handle Problem Language Result Execution time Memory
753308 2023-06-05T03:29:09 Z boyliguanhan Tug of War (BOI15_tug) C++17
23 / 100
 745 ms 12456 KB 
#include<bits/stdc++.h>
#define doi(i) if(!adj[i].size()) {cout << "NO\n";return 0;}if(adj[i].size()<2) {q.push(i);sum+=(i>n/2?1:-1)*((*begin(adj[i])).second);}
#define shift(x) ((x)>0?bt<<(x):bt>>(-x))
using namespace std;
multiset<pair<int, int>> adj[200100];
queue<int> q;
bool del[200100];
bitset<1200000> bt;
int tot;
void dfs(int n, int N) {
	if (del[n]) return;
	del[n] = true;
	int nxt, cost;
	tie(nxt, cost) = *adj[n].begin();
    if(nxt>N)
	    tot += cost;
    else
        tot-=cost;
	if (!del[nxt]) {
		adj[nxt].erase({n, cost});
		adj[n].clear();
		dfs(nxt, N);
	}
}
int main() {
    cin.sync_with_stdio(false);
    cin.tie(nullptr);
    int n, k, sum = 0;
    cin >> n >> k;
    n*=2;
    for(int i = 1; i <= n; i++) {
        int x, y, w;
        cin >> x >> y >> w;
        y+=n/2;
        adj[x].insert({y,w});
        adj[y].insert({x,w});
    }
    for(int i = 1; i <= n; i++) {
        doi(i);
    }
    while(q.size()) {
        int x = q.front(), i = (*adj[x].begin()).first, w= (*adj[x].begin()).second;
        del[x] = 1;
        q.pop();
        adj[i].erase({x,w});
        doi(i);
    }
    bt[sum+600000]=1;
    bt[600000-sum]=1;
    for(int i = 1; i <= n; i++) {
        if(!del[i]) {
            tot = 0;
            adj[i].erase(adj[i].begin());
            dfs(i, n/2);
            bt = shift(tot)|shift(-tot);
        }
    }
    for(int i = -k; i <= k; i++) {
        if(bt[600000+i]) {
            cout << "YES\n";
            return 0;
        }
    }
    cout << "NO\n";
}

Compilation message

tug.cpp: In function 'void dfs(int, int)':
tug.cpp:17:5: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
   17 |     else
      |     ^~~~
tug.cpp:19:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'else'
   19 |  if (!del[nxt]) {
      |  ^~

Subtask #1
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 10452 KB Output is correct
2 Correct 6 ms 10452 KB Output is correct
3 Correct 6 ms 10452 KB Output is correct
4 Correct 5 ms 10452 KB Output is correct
5 Correct 6 ms 10452 KB Output is correct
6 Incorrect 6 ms 10452 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 10452 KB Output is correct
2 Correct 6 ms 10452 KB Output is correct
3 Correct 6 ms 10452 KB Output is correct
4 Correct 5 ms 10452 KB Output is correct
5 Correct 6 ms 10452 KB Output is correct
6 Incorrect 6 ms 10452 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #3
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 716 ms 12336 KB Output is correct
2 Correct 13 ms 11988 KB Output is correct
3 Correct 695 ms 12344 KB Output is correct
4 Correct 14 ms 11988 KB Output is correct
5 Correct 745 ms 12328 KB Output is correct
6 Correct 13 ms 12048 KB Output is correct
7 Correct 741 ms 12344 KB Output is correct
8 Correct 13 ms 11988 KB Output is correct
9 Correct 708 ms 12456 KB Output is correct
10 Correct 14 ms 11988 KB Output is correct
11 Correct 675 ms 12220 KB Output is correct
12 Correct 13 ms 11988 KB Output is correct
13 Correct 691 ms 12452 KB Output is correct
14 Correct 675 ms 12364 KB Output is correct
15 Correct 14 ms 11988 KB Output is correct
16 Correct 679 ms 12244 KB Output is correct
17 Correct 14 ms 11988 KB Output is correct
18 Correct 651 ms 12456 KB Output is correct
19 Correct 14 ms 11964 KB Output is correct
20 Correct 721 ms 12332 KB Output is correct
21 Correct 14 ms 11988 KB Output is correct
22 Correct 342 ms 12372 KB Output is correct

Subtask #4
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 10452 KB Output is correct
2 Correct 6 ms 10452 KB Output is correct
3 Correct 6 ms 10452 KB Output is correct
4 Correct 5 ms 10452 KB Output is correct
5 Correct 6 ms 10452 KB Output is correct
6 Incorrect 6 ms 10452 KB Output isn't correct
7 Halted 0 ms 0 KB -