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Submission #1054493

# Submission time Handle Problem Language Result Execution time Memory
1054493 2024-08-12T10:17:35 Z allin27x Joker (BOI20_joker) C++17
25 / 100
 118 ms 13944 KB 
#include <bits/stdc++.h>
using namespace std;
const int mod = 1e9+7;
#define forn(i,n) for(int i=0; i<n; i++)
#define readv(a,n) vector<int>a(n);forn(i,n)cin>>a[i];
#define readvv(a,n,m) vector<vector<int>> a(n,vector<int>(m));forn(i,n)forn(j,m)cin>>a[i][j];
#define all(a) a.begin(), a.end()
#define _max(x,y) x = max(x,y)
#define _min(x,y) x = min(x,y)
// #define f first
// #define s second

const int N = 2e5+4;
const int SQRT = 460;
int ans[N];

struct qr{
	int l, r, i;
	bool operator<(qr b){
		return make_pair(l/SQRT, r) < make_pair(b.l/SQRT,b.r);
	}
};

vector<qr> queries[SQRT];
int edges[N][2];

int e1[2*N];
void build1(int N) {for (int i=0; i<N; i++) e1[i] = -1;}
int get1(int x) { return e1[x] < 0 ? x : e1[x] = get1(e1[x]); }
bool conn1(int a, int b) { return get1(a) == get1(b); }
int size1(int x) { return -e1[get1(x)]; }
void unite1(int x, int y) {
	x = get1(x), y = get1(y);
	if (x == y) return;
	if (e1[x] > e1[y]) swap(x, y);
	e1[x] += e1[y];
	e1[y] = x;
}


int e2[2*N];
void build2(int N) {for (int i=0; i<N; i++) e2[i] = -1;}
int get2(int x) { return e2[x] < 0 ? x : e2[x] = get2(e2[x]); }
bool conn2(int a, int b) { return get2(a) == get2(b); }
int size2(int x) { return -e2[get2(x)]; }
void unite2(int x, int y) {
	x = get2(x), y = get2(y);
	if (x == y) return;
	if (e2[x] > e2[y]) swap(x, y);
	e2[x] += e2[y];
	e2[y] = x;
}

int st[2*N];
int nd = 0;
int ch[4*SQRT+6];

void solve(){
	int n,m,q; cin>>n>>m>>q;
	for (int i=0; i<m; i++){
		int a,b; cin>>a>>b; a--;b--; edges[i][0]=a; edges[i][1] = b;
	}
	for (int i=0; i<q; i++){
		int l,r; cin>>l>>r; l--; r--;
		qr p; p.l=l;p.r=r;p.i=i;
		queries[l/SQRT].push_back(p);
	}
	for (int i=0; i<SQRT; i++) sort(queries[i].begin(), queries[i].end());
	build1(2*n); build2(2*n);
	int fM =0; 
	for (int t=0; t<SQRT; t++){
		for (int i=0; i<2*n; i++) e2[i] = e1[i],st[i] = e2[i];
		if (t*SQRT >= m) break;
		int fm = 0;
		int i = m-1; int j = queries[t].size()-1;
		while (i>=0){
			if (j<0) break;
			qr p = queries[t][j];
			while (p.r == i){
				int f = 0;
				nd = 0;
				for (int ll=t*SQRT; ll<p.l; ll++){
					int a = get2(edges[ll][0]); int b = get2(edges[ll][1]);
					int c = get2(edges[ll][0]+n); int d = get2(edges[ll][1]+n);
					if (conn2(edges[ll][0],edges[ll][1])) f++;
					unite2(edges[ll][0]+n, edges[ll][1]);
					unite2(edges[ll][0], edges[ll][1]+n);
					ch[nd++] = a;ch[nd++]=b;
					ch[nd++] = d;ch[nd++]=c;
				}
				for (int rr =0; rr<nd; rr++){
					e2[ch[rr]] = st[ch[rr]];
				}
				if (f || fm || fM) ans[p.i] = 1;
				j--;
				if (j<0) break;
				p = queries[t][j];
			}
			if (j<0) break;
			fm += conn2(edges[i][0], edges[i][1]);
			int a = get2(edges[i][0]); int b = get2(edges[i][1]);
			int c = get2(edges[i][0]+n); int d = get2(edges[i][1]+n);
			unite2(edges[i][0] + n, edges[i][1]);
			unite2(edges[i][0], edges[i][1] + n);
			st[a] = e2[a];
			st[b] = e2[b];
			st[c] = e2[c];
			st[d] = e2[d];
			i--;
		}
		for (int ll=SQRT*t; ll<min(m, SQRT*t + SQRT); ll++){
			fM += conn1(edges[ll][0], edges[ll][1]);
			unite1(edges[ll][0] + n, edges[ll][1]);
			unite1(edges[ll][0], edges[ll][1] + n);
		}
	}
	for (int i=0;i<q; i++) cout<<(ans[i]?"YES\n":"NO\n");
}


signed main(){ 
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	int t=1;
	while(t--){
		solve();
	}	
	return 0;
}

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Incorrect 1 ms 6492 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Incorrect 1 ms 6492 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 98 ms 13944 KB Output is correct
4 Correct 118 ms 11708 KB Output is correct
5 Correct 104 ms 12804 KB Output is correct
6 Correct 89 ms 13452 KB Output is correct
7 Correct 78 ms 12732 KB Output is correct
8 Correct 73 ms 12476 KB Output is correct
9 Correct 94 ms 12792 KB Output is correct
10 Correct 117 ms 12600 KB Output is correct
11 Correct 91 ms 13108 KB Output is correct
12 Correct 115 ms 12732 KB Output is correct
13 Correct 58 ms 13256 KB Output is correct
14 Correct 93 ms 12736 KB Output is correct
15 Correct 114 ms 12992 KB Output is correct
16 Correct 112 ms 13768 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Incorrect 1 ms 6492 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Incorrect 1 ms 6492 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Incorrect 1 ms 6492 KB Output isn't correct
5 Halted 0 ms 0 KB -