oj.uz

Submission #106154

# Submission time Handle Problem Language Result Execution time Memory
106154 2019-04-16T21:29:42 Z Noam527 Alternating Current (BOI18_alternating) C++17
100 / 100
 148 ms 15448 KB 
#include <bits/stdc++.h>
#define CHECK cout << "ok" << endl
#define finish(x) return cout << x << endl, 0
typedef long long ll;
typedef long double ldb;
const int md = 1e9 + 7;
const ll inf = 1e18;
const int OO = 0;
const int OOO = 1;
using namespace std;

struct edge {
	int to, i;
	edge(int tt = 0, int ii = 0) : to(tt), i(ii) {}
};

int n, m;
int C[100005] = {};
int dp[200005], to[200005];
int range[200005] = {};

vector<edge> g[200005];
vector<int> vis; int nxtcol = 5;
vector<int> path;

string ans;

void add(int l, int r) {
	C[l]++;
	C[r + 1]--;
}
void pre() {
	for (int i = 1; i <= n; i++) C[i] += C[i - 1];
	for (int i = 1; i <= n; i++) {
		if (C[i] == 1) {
			cout << "impossible\n";
			exit(0);
		}
		C[i] = max(0, min(1, C[i] - 2));
		if (C[i]) {
			if (OO) {
				cout << "from C adding " << i << " " << i - 1 << '\n';
			}
			g[i].push_back(edge(i - 1, -1));
			g[i + n].push_back(edge(i - 1 + n, -1));
		}
	}
}

bool dfs(int v, int tar) {
	if (OO) {
		cout << "dfsing " << v << " tar " << tar << '\n';
	}
	if (v == tar) return true;
	if (vis[v % n] == nxtcol) return false;
	vis[v % n] = nxtcol;
	for (const auto &i : g[v]) {
		path.push_back(i.i);
		if (dfs(i.to, tar)) return true;
		path.pop_back();
	}
	return false;
}

bool check(int v) {
	if (OO) {
		cout << "starting check on " << v << '\n';
	}
	nxtcol++;
	for (const auto &i : g[v]) {
		if (i.to != v - 1) {
			path.push_back(i.i);
			if (dfs(i.to, v + n)) return true;
			path.pop_back();
		}
	}
	return false;
}

int main() {
	ios::sync_with_stdio(0), cin.tie(0);
	cin >> n >> m;
	for (int i = 0, l, r; i < m; i++) {
		cin >> l >> r;
		if (l > r) {
			add(l, n);
			add(1, r);
			l--;
			r += n;
			if (OO) cout << "from input adding " << l << " " << r << '\n';
			g[l].push_back(edge(r, i));
			g[l + n].push_back(edge(2 * n, i));
		}
		else {
			add(l, r);
			l--;
			if (OO) cout << "from input adding " << l << " " << r << '\n';
			g[l].push_back(edge(r, i));
			g[l + n].push_back(edge(r + n, i));
		}
	}
	pre();

	ans.resize(m, '1');
	vis.resize(n, 0);

	for (int i = 0; i < n; i++) {
		if (check(i)) {
			for (const auto &j : path)
				if (j != -1) ans[j] = '0';
			finish(ans);
		}
	}
	finish("impossible");
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 6 ms 4992 KB Output is correct
3 Correct 6 ms 4992 KB Output is correct
4 Correct 7 ms 4992 KB Output is correct
5 Correct 6 ms 5120 KB Output is correct
6 Correct 6 ms 4992 KB Output is correct
7 Correct 7 ms 5120 KB Output is correct
8 Correct 6 ms 5120 KB Output is correct
9 Correct 6 ms 5120 KB Output is correct
10 Correct 6 ms 5248 KB Output is correct
11 Correct 6 ms 4992 KB Output is correct
12 Correct 7 ms 5248 KB Output is correct
13 Correct 7 ms 5120 KB Output is correct
14 Correct 8 ms 5120 KB Output is correct
15 Correct 6 ms 5120 KB Output is correct
16 Correct 6 ms 4992 KB Output is correct
17 Correct 6 ms 4992 KB Output is correct
18 Correct 6 ms 4992 KB Output is correct
19 Correct 6 ms 5120 KB Output is correct
20 Correct 6 ms 4992 KB Output is correct
21 Correct 7 ms 4992 KB Output is correct
22 Correct 6 ms 4992 KB Output is correct
23 Correct 6 ms 5120 KB Output is correct
24 Correct 6 ms 4992 KB Output is correct
25 Correct 6 ms 5120 KB Output is correct
26 Correct 6 ms 5120 KB Output is correct
27 Correct 6 ms 5120 KB Output is correct
28 Correct 6 ms 4992 KB Output is correct
29 Correct 6 ms 4992 KB Output is correct
30 Correct 6 ms 5120 KB Output is correct
31 Correct 6 ms 5052 KB Output is correct
32 Correct 6 ms 5120 KB Output is correct
33 Correct 6 ms 5120 KB Output is correct
34 Correct 6 ms 5120 KB Output is correct
35 Correct 6 ms 5120 KB Output is correct
36 Correct 5 ms 4992 KB Output is correct
37 Correct 5 ms 5120 KB Output is correct
38 Correct 6 ms 4992 KB Output is correct
39 Correct 6 ms 4992 KB Output is correct
40 Correct 6 ms 5120 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 6 ms 4992 KB Output is correct
3 Correct 6 ms 4992 KB Output is correct
4 Correct 7 ms 4992 KB Output is correct
5 Correct 6 ms 5120 KB Output is correct
6 Correct 6 ms 4992 KB Output is correct
7 Correct 7 ms 5120 KB Output is correct
8 Correct 6 ms 5120 KB Output is correct
9 Correct 6 ms 5120 KB Output is correct
10 Correct 6 ms 5248 KB Output is correct
11 Correct 6 ms 4992 KB Output is correct
12 Correct 7 ms 5248 KB Output is correct
13 Correct 7 ms 5120 KB Output is correct
14 Correct 8 ms 5120 KB Output is correct
15 Correct 6 ms 5120 KB Output is correct
16 Correct 6 ms 4992 KB Output is correct
17 Correct 6 ms 4992 KB Output is correct
18 Correct 6 ms 4992 KB Output is correct
19 Correct 6 ms 5120 KB Output is correct
20 Correct 6 ms 4992 KB Output is correct
21 Correct 7 ms 4992 KB Output is correct
22 Correct 6 ms 4992 KB Output is correct
23 Correct 6 ms 5120 KB Output is correct
24 Correct 6 ms 4992 KB Output is correct
25 Correct 6 ms 5120 KB Output is correct
26 Correct 6 ms 5120 KB Output is correct
27 Correct 6 ms 5120 KB Output is correct
28 Correct 6 ms 4992 KB Output is correct
29 Correct 6 ms 4992 KB Output is correct
30 Correct 6 ms 5120 KB Output is correct
31 Correct 6 ms 5052 KB Output is correct
32 Correct 6 ms 5120 KB Output is correct
33 Correct 6 ms 5120 KB Output is correct
34 Correct 6 ms 5120 KB Output is correct
35 Correct 6 ms 5120 KB Output is correct
36 Correct 5 ms 4992 KB Output is correct
37 Correct 5 ms 5120 KB Output is correct
38 Correct 6 ms 4992 KB Output is correct
39 Correct 6 ms 4992 KB Output is correct
40 Correct 6 ms 5120 KB Output is correct
41 Correct 6 ms 4992 KB Output is correct
42 Correct 6 ms 5120 KB Output is correct
43 Correct 6 ms 5120 KB Output is correct
44 Correct 7 ms 5120 KB Output is correct
45 Correct 6 ms 5120 KB Output is correct
46 Correct 6 ms 5120 KB Output is correct
47 Correct 6 ms 4992 KB Output is correct
48 Correct 6 ms 5120 KB Output is correct
49 Correct 6 ms 4992 KB Output is correct
50 Correct 5 ms 4992 KB Output is correct
51 Correct 6 ms 5120 KB Output is correct
52 Correct 6 ms 4992 KB Output is correct
53 Correct 6 ms 4992 KB Output is correct
54 Correct 5 ms 5120 KB Output is correct
55 Correct 6 ms 4992 KB Output is correct
56 Correct 7 ms 5120 KB Output is correct
57 Correct 6 ms 5120 KB Output is correct
58 Correct 6 ms 4992 KB Output is correct
59 Correct 5 ms 5120 KB Output is correct
60 Correct 5 ms 4992 KB Output is correct
61 Correct 6 ms 4992 KB Output is correct
62 Correct 6 ms 5120 KB Output is correct
63 Correct 7 ms 5120 KB Output is correct
64 Correct 6 ms 4992 KB Output is correct
65 Correct 6 ms 5120 KB Output is correct
66 Correct 7 ms 5120 KB Output is correct
67 Correct 5 ms 5120 KB Output is correct
68 Correct 6 ms 5120 KB Output is correct
69 Correct 8 ms 4992 KB Output is correct

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 6 ms 4992 KB Output is correct
3 Correct 6 ms 4992 KB Output is correct
4 Correct 7 ms 4992 KB Output is correct
5 Correct 6 ms 5120 KB Output is correct
6 Correct 6 ms 4992 KB Output is correct
7 Correct 7 ms 5120 KB Output is correct
8 Correct 6 ms 5120 KB Output is correct
9 Correct 6 ms 5120 KB Output is correct
10 Correct 6 ms 5248 KB Output is correct
11 Correct 6 ms 4992 KB Output is correct
12 Correct 7 ms 5248 KB Output is correct
13 Correct 7 ms 5120 KB Output is correct
14 Correct 8 ms 5120 KB Output is correct
15 Correct 6 ms 5120 KB Output is correct
16 Correct 6 ms 4992 KB Output is correct
17 Correct 6 ms 4992 KB Output is correct
18 Correct 6 ms 4992 KB Output is correct
19 Correct 6 ms 5120 KB Output is correct
20 Correct 6 ms 4992 KB Output is correct
21 Correct 7 ms 4992 KB Output is correct
22 Correct 6 ms 4992 KB Output is correct
23 Correct 6 ms 5120 KB Output is correct
24 Correct 6 ms 4992 KB Output is correct
25 Correct 6 ms 5120 KB Output is correct
26 Correct 6 ms 5120 KB Output is correct
27 Correct 6 ms 5120 KB Output is correct
28 Correct 6 ms 4992 KB Output is correct
29 Correct 6 ms 4992 KB Output is correct
30 Correct 6 ms 5120 KB Output is correct
31 Correct 6 ms 5052 KB Output is correct
32 Correct 6 ms 5120 KB Output is correct
33 Correct 6 ms 5120 KB Output is correct
34 Correct 6 ms 5120 KB Output is correct
35 Correct 6 ms 5120 KB Output is correct
36 Correct 5 ms 4992 KB Output is correct
37 Correct 5 ms 5120 KB Output is correct
38 Correct 6 ms 4992 KB Output is correct
39 Correct 6 ms 4992 KB Output is correct
40 Correct 6 ms 5120 KB Output is correct
41 Correct 6 ms 4992 KB Output is correct
42 Correct 6 ms 5120 KB Output is correct
43 Correct 6 ms 5120 KB Output is correct
44 Correct 7 ms 5120 KB Output is correct
45 Correct 6 ms 5120 KB Output is correct
46 Correct 6 ms 5120 KB Output is correct
47 Correct 6 ms 4992 KB Output is correct
48 Correct 6 ms 5120 KB Output is correct
49 Correct 6 ms 4992 KB Output is correct
50 Correct 5 ms 4992 KB Output is correct
51 Correct 6 ms 5120 KB Output is correct
52 Correct 6 ms 4992 KB Output is correct
53 Correct 6 ms 4992 KB Output is correct
54 Correct 5 ms 5120 KB Output is correct
55 Correct 6 ms 4992 KB Output is correct
56 Correct 7 ms 5120 KB Output is correct
57 Correct 6 ms 5120 KB Output is correct
58 Correct 6 ms 4992 KB Output is correct
59 Correct 5 ms 5120 KB Output is correct
60 Correct 5 ms 4992 KB Output is correct
61 Correct 6 ms 4992 KB Output is correct
62 Correct 6 ms 5120 KB Output is correct
63 Correct 7 ms 5120 KB Output is correct
64 Correct 6 ms 4992 KB Output is correct
65 Correct 6 ms 5120 KB Output is correct
66 Correct 7 ms 5120 KB Output is correct
67 Correct 5 ms 5120 KB Output is correct
68 Correct 6 ms 5120 KB Output is correct
69 Correct 8 ms 4992 KB Output is correct
70 Correct 7 ms 5120 KB Output is correct
71 Correct 6 ms 5120 KB Output is correct
72 Correct 6 ms 4992 KB Output is correct
73 Correct 6 ms 5120 KB Output is correct
74 Correct 6 ms 5120 KB Output is correct
75 Correct 6 ms 4992 KB Output is correct
76 Correct 6 ms 5120 KB Output is correct
77 Correct 7 ms 5120 KB Output is correct
78 Correct 5 ms 5120 KB Output is correct
79 Correct 5 ms 4992 KB Output is correct
80 Correct 6 ms 5120 KB Output is correct
81 Correct 6 ms 5120 KB Output is correct
82 Correct 6 ms 5120 KB Output is correct
83 Correct 7 ms 5120 KB Output is correct
84 Correct 7 ms 5120 KB Output is correct
85 Correct 6 ms 4992 KB Output is correct
86 Correct 6 ms 5120 KB Output is correct
87 Correct 6 ms 5120 KB Output is correct
88 Correct 6 ms 5120 KB Output is correct
89 Correct 5 ms 5120 KB Output is correct
90 Correct 6 ms 5120 KB Output is correct
91 Correct 6 ms 5120 KB Output is correct
92 Correct 6 ms 5120 KB Output is correct
93 Correct 5 ms 5120 KB Output is correct
94 Correct 6 ms 4992 KB Output is correct
95 Correct 8 ms 5120 KB Output is correct
96 Correct 6 ms 5120 KB Output is correct
97 Correct 6 ms 5248 KB Output is correct
98 Correct 7 ms 5120 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 36 ms 13796 KB Output is correct
2 Correct 7 ms 5888 KB Output is correct
3 Correct 36 ms 8568 KB Output is correct
4 Correct 32 ms 12160 KB Output is correct
5 Correct 90 ms 12408 KB Output is correct
6 Correct 83 ms 10620 KB Output is correct
7 Correct 73 ms 12864 KB Output is correct
8 Correct 14 ms 8576 KB Output is correct
9 Correct 15 ms 8576 KB Output is correct
10 Correct 100 ms 12660 KB Output is correct
11 Correct 73 ms 11384 KB Output is correct
12 Correct 72 ms 11640 KB Output is correct
13 Correct 8 ms 5760 KB Output is correct
14 Correct 7 ms 5888 KB Output is correct
15 Correct 116 ms 14924 KB Output is correct
16 Correct 33 ms 11696 KB Output is correct
17 Correct 110 ms 15448 KB Output is correct
18 Correct 40 ms 7928 KB Output is correct
19 Correct 11 ms 5760 KB Output is correct
20 Correct 51 ms 10740 KB Output is correct

Subtask #5
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 6 ms 4992 KB Output is correct
3 Correct 6 ms 4992 KB Output is correct
4 Correct 7 ms 4992 KB Output is correct
5 Correct 6 ms 5120 KB Output is correct
6 Correct 6 ms 4992 KB Output is correct
7 Correct 7 ms 5120 KB Output is correct
8 Correct 6 ms 5120 KB Output is correct
9 Correct 6 ms 5120 KB Output is correct
10 Correct 6 ms 5248 KB Output is correct
11 Correct 6 ms 4992 KB Output is correct
12 Correct 7 ms 5248 KB Output is correct
13 Correct 7 ms 5120 KB Output is correct
14 Correct 8 ms 5120 KB Output is correct
15 Correct 6 ms 5120 KB Output is correct
16 Correct 6 ms 4992 KB Output is correct
17 Correct 6 ms 4992 KB Output is correct
18 Correct 6 ms 4992 KB Output is correct
19 Correct 6 ms 5120 KB Output is correct
20 Correct 6 ms 4992 KB Output is correct
21 Correct 7 ms 4992 KB Output is correct
22 Correct 6 ms 4992 KB Output is correct
23 Correct 6 ms 5120 KB Output is correct
24 Correct 6 ms 4992 KB Output is correct
25 Correct 6 ms 5120 KB Output is correct
26 Correct 6 ms 5120 KB Output is correct
27 Correct 6 ms 5120 KB Output is correct
28 Correct 6 ms 4992 KB Output is correct
29 Correct 6 ms 4992 KB Output is correct
30 Correct 6 ms 5120 KB Output is correct
31 Correct 6 ms 5052 KB Output is correct
32 Correct 6 ms 5120 KB Output is correct
33 Correct 6 ms 5120 KB Output is correct
34 Correct 6 ms 5120 KB Output is correct
35 Correct 6 ms 5120 KB Output is correct
36 Correct 5 ms 4992 KB Output is correct
37 Correct 5 ms 5120 KB Output is correct
38 Correct 6 ms 4992 KB Output is correct
39 Correct 6 ms 4992 KB Output is correct
40 Correct 6 ms 5120 KB Output is correct
41 Correct 6 ms 4992 KB Output is correct
42 Correct 6 ms 5120 KB Output is correct
43 Correct 6 ms 5120 KB Output is correct
44 Correct 7 ms 5120 KB Output is correct
45 Correct 6 ms 5120 KB Output is correct
46 Correct 6 ms 5120 KB Output is correct
47 Correct 6 ms 4992 KB Output is correct
48 Correct 6 ms 5120 KB Output is correct
49 Correct 6 ms 4992 KB Output is correct
50 Correct 5 ms 4992 KB Output is correct
51 Correct 6 ms 5120 KB Output is correct
52 Correct 6 ms 4992 KB Output is correct
53 Correct 6 ms 4992 KB Output is correct
54 Correct 5 ms 5120 KB Output is correct
55 Correct 6 ms 4992 KB Output is correct
56 Correct 7 ms 5120 KB Output is correct
57 Correct 6 ms 5120 KB Output is correct
58 Correct 6 ms 4992 KB Output is correct
59 Correct 5 ms 5120 KB Output is correct
60 Correct 5 ms 4992 KB Output is correct
61 Correct 6 ms 4992 KB Output is correct
62 Correct 6 ms 5120 KB Output is correct
63 Correct 7 ms 5120 KB Output is correct
64 Correct 6 ms 4992 KB Output is correct
65 Correct 6 ms 5120 KB Output is correct
66 Correct 7 ms 5120 KB Output is correct
67 Correct 5 ms 5120 KB Output is correct
68 Correct 6 ms 5120 KB Output is correct
69 Correct 8 ms 4992 KB Output is correct
70 Correct 7 ms 5120 KB Output is correct
71 Correct 6 ms 5120 KB Output is correct
72 Correct 6 ms 4992 KB Output is correct
73 Correct 6 ms 5120 KB Output is correct
74 Correct 6 ms 5120 KB Output is correct
75 Correct 6 ms 4992 KB Output is correct
76 Correct 6 ms 5120 KB Output is correct
77 Correct 7 ms 5120 KB Output is correct
78 Correct 5 ms 5120 KB Output is correct
79 Correct 5 ms 4992 KB Output is correct
80 Correct 6 ms 5120 KB Output is correct
81 Correct 6 ms 5120 KB Output is correct
82 Correct 6 ms 5120 KB Output is correct
83 Correct 7 ms 5120 KB Output is correct
84 Correct 7 ms 5120 KB Output is correct
85 Correct 6 ms 4992 KB Output is correct
86 Correct 6 ms 5120 KB Output is correct
87 Correct 6 ms 5120 KB Output is correct
88 Correct 6 ms 5120 KB Output is correct
89 Correct 5 ms 5120 KB Output is correct
90 Correct 6 ms 5120 KB Output is correct
91 Correct 6 ms 5120 KB Output is correct
92 Correct 6 ms 5120 KB Output is correct
93 Correct 5 ms 5120 KB Output is correct
94 Correct 6 ms 4992 KB Output is correct
95 Correct 8 ms 5120 KB Output is correct
96 Correct 6 ms 5120 KB Output is correct
97 Correct 6 ms 5248 KB Output is correct
98 Correct 7 ms 5120 KB Output is correct
99 Correct 36 ms 13796 KB Output is correct
100 Correct 7 ms 5888 KB Output is correct
101 Correct 36 ms 8568 KB Output is correct
102 Correct 32 ms 12160 KB Output is correct
103 Correct 90 ms 12408 KB Output is correct
104 Correct 83 ms 10620 KB Output is correct
105 Correct 73 ms 12864 KB Output is correct
106 Correct 14 ms 8576 KB Output is correct
107 Correct 15 ms 8576 KB Output is correct
108 Correct 100 ms 12660 KB Output is correct
109 Correct 73 ms 11384 KB Output is correct
110 Correct 72 ms 11640 KB Output is correct
111 Correct 8 ms 5760 KB Output is correct
112 Correct 7 ms 5888 KB Output is correct
113 Correct 116 ms 14924 KB Output is correct
114 Correct 33 ms 11696 KB Output is correct
115 Correct 110 ms 15448 KB Output is correct
116 Correct 40 ms 7928 KB Output is correct
117 Correct 11 ms 5760 KB Output is correct
118 Correct 51 ms 10740 KB Output is correct
119 Correct 7 ms 6016 KB Output is correct
120 Correct 63 ms 12916 KB Output is correct
121 Correct 36 ms 9976 KB Output is correct
122 Correct 6 ms 4992 KB Output is correct
123 Correct 9 ms 5760 KB Output is correct
124 Correct 36 ms 7928 KB Output is correct
125 Correct 36 ms 9592 KB Output is correct
126 Correct 13 ms 7296 KB Output is correct
127 Correct 27 ms 9728 KB Output is correct
128 Correct 69 ms 11380 KB Output is correct
129 Correct 40 ms 9720 KB Output is correct
130 Correct 49 ms 10232 KB Output is correct
131 Correct 7 ms 5888 KB Output is correct
132 Correct 8 ms 5888 KB Output is correct
133 Correct 148 ms 15184 KB Output is correct
134 Correct 85 ms 15088 KB Output is correct
135 Correct 30 ms 14844 KB Output is correct
136 Correct 57 ms 9368 KB Output is correct
137 Correct 93 ms 12620 KB Output is correct
138 Correct 37 ms 12920 KB Output is correct