oj.uz

답안 #155747

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
155747 2019-09-30T08:34:36 Z youngyojun Alternating Current (BOI18_alternating) C++11
55 / 100
 179 ms 27896 KB 
#include <bits/stdc++.h>
#define eb emplace_back
#define sz(V) ((int)(V).size())
#define allv(V) ((V).begin()),((V).end())
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
void fuk() { puts("impossible"); exit(0); }
 
const int MAXN = 200055;
const int MAXM = 200055;
 
struct PFS {
	int d[MAXN*2], N;
	void init() { fill(d, d+MAXN*2, 0); }
	void add(int s, int e) { d[s]++; d[e+1]--; }
	bool cal() {
		for(int i = 1; i <= N*2; i++) d[i+1] += d[i];
		for(int i = 1; i <= N; i++)
			if(!(d[i] + d[i+N])) return false;
		return true;
	}
} preA, preB;
 
vector<int> T[MAXN*2];
vector<int> G[MAXM], CH;
bitset<MAXM> isChild;
int prt[MAXM];
 
bitset<MAXM> CA, CB;
 
int A[MAXM], B[MAXM];
 
int Ans[MAXM];
int N, M;
 
bool isValid() {
	preA.init(); preB.init();
	for(int i = 1; i <= M; i++)
		(Ans[i] ? preA : preB).add(A[i], B[i]);
	return preA.cal() && preB.cal();
}
 
void dfs(int i, int c) {
	prt[i] = c;
	for(int v : G[i]) if(!prt[v])
		dfs(v, c);
}
 
int main() {
	ios::sync_with_stdio(false);
 
	cin >> N >> M;
	preA.N = preB.N = N;
	for(int i = 1; i <= M; i++) {
		cin >> A[i] >> B[i];
		if(A[i] > B[i]) B[i] += N;
		if(B[i]-A[i] == N-1) { A[i] = 1; B[i] = N; }
		T[A[i]].eb(i);
		T[A[i]+N].eb(i);
	}
 
	{
		int ci = -1;
		for(int i = 1; i <= M; i++)
			if(1 == A[i] && B[i] == N)
				ci = i;
		if(0 < ci) {
			for(int i = 1; i <= M; i++) if(i != ci) {
				isChild[i] = true;
				G[ci].eb(i);
			}
		} else {
			for(int i = 1; i <= N*2; i++)
				sort(allv(T[i]), [&](int a, int b) {
					if(B[a] != B[b]) return B[a] > B[b];
					return a < b;
				});
			for(int i = 1, et = 0, ei = -1; i <= N*2; i++) {
				for(int v : T[i]) {
					int e = i + (B[v]-A[v]);
					if(e <= et) {
						isChild[v] = true;
						G[ei].eb(v);
					}
					else {
						et = e; ei = v;
					}
				}
			}
		}
	}
	for(int i = 1; i <= M; i++) if(!isChild[i]) CH.eb(i);
	for(int i : CH) dfs(i, i);
	for(int i = 1; i <= M; i++) G[i].clear();
	for(int i = 1; i <= M; i++) if(isChild[i]) G[prt[i]].eb(i);
	sort(allv(CH), [&](int a, int b) { return A[a] < A[b]; });
 
	for(int v : CH) preA.add(A[v], B[v]);
	if(!preA.cal()) fuk();
	preA.init();
 
	if(sz(CH) & 1) {
		if(sz(CH) < 10) {
			for(int i = 0, n = sz(CH); i < n; i++) {
				for(int j = 0; j < i; j++) Ans[CH[j]] = (i-j-1) & 1;
				for(int j = i; j < n; j++) Ans[CH[j]] = (j-i) & 1;
				for(int j = 1; j <= M; j++) if(isChild[j])
					Ans[j] = !Ans[prt[j]];
				if(isValid()) break;
			}
		} else { 
			int PS[MAXN*2] = {0, };
			int n = sz(CH);
			for(int i = 0; i < n; i++) {
				int s = B[CH[(n+i-1)%n]] + 1;
				int e = A[CH[(i+1)%n]] - 1;
				if(!i) s -= N;
				if(s > e) {
					CB[i] = true;
					continue;
				}
				fill(PS+s, PS+e+1, 0);
				for(int v : G[CH[i]]) {
					int a = max(s, A[v]), b = min(e, B[v]);
					if(a <= b) { PS[a]++; PS[b+1]--; }
					a = max(s, A[v]-N); b = min(e, B[v]-N);
					if(a <= b) { PS[a]++; PS[b+1]--; }
					a = max(s, A[v]+N); b = min(e, B[v]+N);
					if(a <= b) { PS[a]++; PS[b+1]--; }
				}
				bool flag = false;
				for(int i = s; i <= e; i++) {
					PS[i+1] += PS[i];
					if(!PS[i]) flag = true;
				}
				CB[i] = !flag;
			}
 
			for(int i = 0; i < n; i++) {
				int s = B[CH[(n+i-2)%n]] + 1;
				int e = A[CH[(i+1)%n]] - 1;
				if(i-2 < 0) s -= N; if(n <= i+1) e += N;
				if(s > e) {
					CA[i] = true;
					continue;
				}
				fill(PS+s, PS+e+1, 0);
				vector<int> V = G[CH[(n+i-1)%n]];
				for(int v : G[CH[i]]) V.eb(v);
				for(int v : V) {
					int a = max(s, A[v]), b = min(e, B[v]);
					if(a <= b) { PS[a]++; PS[b+1]--; }
					a = max(s, A[v]-N); b = min(e, B[v]-N);
					if(a <= b) { PS[a]++; PS[b+1]--; }
					a = max(s, A[v]+N); b = min(e, B[v]+N);
					if(a <= b) { PS[a]++; PS[b+1]--; }
				}
				bool flag = false;
				for(int i = s; i <= e; i++) {
					PS[i+1] += PS[i];
					if(!PS[i]) flag = true;
				}
				CA[i] = !flag;
			}
 
			int cnt = 0;
			for(int i = 0; i < n; i++) if(CB[i]) cnt++;
 
			for(int i = 0; i < n; i++) {
				if(!CA[i]) continue;
				int ncnt = cnt;
				if(CB[i]) ncnt--;
				if(CB[(n+i-1)%n]) ncnt--;
 
				if(ncnt < n-2) continue;
 
				for(int j = 0; j < i; j++) Ans[CH[j]] = (i-j-1) & 1;
				for(int j = i; j < n; j++) Ans[CH[j]] = (j-i) & 1;
				for(int j = 1; j <= M; j++) if(isChild[j])
					Ans[j] = !Ans[prt[j]];
				break;
			}
		}
	} else {
		for(int i = 0, n = sz(CH); i < n; i++)
			Ans[CH[i]] = i & 1;
		for(int i = 1; i <= M; i++) if(isChild[i])
			Ans[i] = !Ans[prt[i]];
	}
 
	if(!isValid()) fuk();
	for(int i = 1; i <= M; i++) printf("%d", !!Ans[i]);
	puts("");
	return 0;
}

Compilation message

alternating.cpp: In function 'int main()':
alternating.cpp:145:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if(i-2 < 0) s -= N; if(n <= i+1) e += N;
     ^~
alternating.cpp:145:25: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
     if(i-2 < 0) s -= N; if(n <= i+1) e += N;
                         ^~

Subtask #1
13.0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 17528 KB Output is correct
2 Correct 18 ms 17528 KB Output is correct
3 Correct 18 ms 17528 KB Output is correct
4 Correct 22 ms 17528 KB Output is correct
5 Correct 22 ms 17528 KB Output is correct
6 Correct 21 ms 17656 KB Output is correct
7 Correct 18 ms 17528 KB Output is correct
8 Correct 18 ms 17528 KB Output is correct
9 Correct 42 ms 17656 KB Output is correct
10 Correct 21 ms 17528 KB Output is correct
11 Correct 17 ms 17656 KB Output is correct
12 Correct 22 ms 17656 KB Output is correct
13 Correct 18 ms 17528 KB Output is correct
14 Correct 18 ms 17656 KB Output is correct
15 Correct 19 ms 17528 KB Output is correct
16 Correct 18 ms 17656 KB Output is correct
17 Correct 17 ms 17656 KB Output is correct
18 Correct 18 ms 17656 KB Output is correct
19 Correct 18 ms 17656 KB Output is correct
20 Correct 17 ms 17656 KB Output is correct
21 Correct 18 ms 17656 KB Output is correct
22 Correct 18 ms 17656 KB Output is correct
23 Correct 18 ms 17528 KB Output is correct
24 Correct 18 ms 17532 KB Output is correct
25 Correct 18 ms 17528 KB Output is correct
26 Correct 17 ms 17528 KB Output is correct
27 Correct 18 ms 14456 KB Output is correct
28 Correct 18 ms 17528 KB Output is correct
29 Correct 18 ms 17660 KB Output is correct
30 Correct 19 ms 17660 KB Output is correct
31 Correct 18 ms 17656 KB Output is correct
32 Correct 18 ms 17656 KB Output is correct
33 Correct 18 ms 17528 KB Output is correct
34 Correct 17 ms 14456 KB Output is correct
35 Correct 18 ms 17656 KB Output is correct
36 Correct 18 ms 17656 KB Output is correct
37 Correct 21 ms 17656 KB Output is correct
38 Correct 20 ms 17528 KB Output is correct
39 Correct 18 ms 17656 KB Output is correct
40 Correct 18 ms 17656 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 17528 KB Output is correct
2 Correct 18 ms 17528 KB Output is correct
3 Correct 18 ms 17528 KB Output is correct
4 Correct 22 ms 17528 KB Output is correct
5 Correct 22 ms 17528 KB Output is correct
6 Correct 21 ms 17656 KB Output is correct
7 Correct 18 ms 17528 KB Output is correct
8 Correct 18 ms 17528 KB Output is correct
9 Correct 42 ms 17656 KB Output is correct
10 Correct 21 ms 17528 KB Output is correct
11 Correct 17 ms 17656 KB Output is correct
12 Correct 22 ms 17656 KB Output is correct
13 Correct 18 ms 17528 KB Output is correct
14 Correct 18 ms 17656 KB Output is correct
15 Correct 19 ms 17528 KB Output is correct
16 Correct 18 ms 17656 KB Output is correct
17 Correct 17 ms 17656 KB Output is correct
18 Correct 18 ms 17656 KB Output is correct
19 Correct 18 ms 17656 KB Output is correct
20 Correct 17 ms 17656 KB Output is correct
21 Correct 18 ms 17656 KB Output is correct
22 Correct 18 ms 17656 KB Output is correct
23 Correct 18 ms 17528 KB Output is correct
24 Correct 18 ms 17532 KB Output is correct
25 Correct 18 ms 17528 KB Output is correct
26 Correct 17 ms 17528 KB Output is correct
27 Correct 18 ms 14456 KB Output is correct
28 Correct 18 ms 17528 KB Output is correct
29 Correct 18 ms 17660 KB Output is correct
30 Correct 19 ms 17660 KB Output is correct
31 Correct 18 ms 17656 KB Output is correct
32 Correct 18 ms 17656 KB Output is correct
33 Correct 18 ms 17528 KB Output is correct
34 Correct 17 ms 14456 KB Output is correct
35 Correct 18 ms 17656 KB Output is correct
36 Correct 18 ms 17656 KB Output is correct
37 Correct 21 ms 17656 KB Output is correct
38 Correct 20 ms 17528 KB Output is correct
39 Correct 18 ms 17656 KB Output is correct
40 Correct 18 ms 17656 KB Output is correct
41 Correct 19 ms 17684 KB Output is correct
42 Correct 20 ms 19192 KB Output is correct
43 Correct 19 ms 19192 KB Output is correct
44 Correct 18 ms 17532 KB Output is correct
45 Correct 20 ms 19192 KB Output is correct
46 Correct 18 ms 17656 KB Output is correct
47 Correct 20 ms 17656 KB Output is correct
48 Correct 18 ms 17656 KB Output is correct
49 Correct 18 ms 17528 KB Output is correct
50 Correct 20 ms 17656 KB Output is correct
51 Correct 22 ms 19192 KB Output is correct
52 Correct 18 ms 17656 KB Output is correct
53 Correct 23 ms 19196 KB Output is correct
54 Correct 18 ms 17528 KB Output is correct
55 Correct 18 ms 17528 KB Output is correct
56 Correct 18 ms 17656 KB Output is correct
57 Correct 18 ms 17604 KB Output is correct
58 Correct 21 ms 17656 KB Output is correct
59 Correct 34 ms 17656 KB Output is correct
60 Correct 18 ms 17596 KB Output is correct
61 Correct 21 ms 17528 KB Output is correct
62 Correct 15 ms 14504 KB Output is correct
63 Correct 15 ms 14456 KB Output is correct
64 Correct 18 ms 17528 KB Output is correct
65 Correct 18 ms 17528 KB Output is correct
66 Correct 18 ms 17564 KB Output is correct
67 Correct 19 ms 19192 KB Output is correct
68 Correct 19 ms 19192 KB Output is correct
69 Correct 19 ms 17656 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 17528 KB Output is correct
2 Correct 18 ms 17528 KB Output is correct
3 Correct 18 ms 17528 KB Output is correct
4 Correct 22 ms 17528 KB Output is correct
5 Correct 22 ms 17528 KB Output is correct
6 Correct 21 ms 17656 KB Output is correct
7 Correct 18 ms 17528 KB Output is correct
8 Correct 18 ms 17528 KB Output is correct
9 Correct 42 ms 17656 KB Output is correct
10 Correct 21 ms 17528 KB Output is correct
11 Correct 17 ms 17656 KB Output is correct
12 Correct 22 ms 17656 KB Output is correct
13 Correct 18 ms 17528 KB Output is correct
14 Correct 18 ms 17656 KB Output is correct
15 Correct 19 ms 17528 KB Output is correct
16 Correct 18 ms 17656 KB Output is correct
17 Correct 17 ms 17656 KB Output is correct
18 Correct 18 ms 17656 KB Output is correct
19 Correct 18 ms 17656 KB Output is correct
20 Correct 17 ms 17656 KB Output is correct
21 Correct 18 ms 17656 KB Output is correct
22 Correct 18 ms 17656 KB Output is correct
23 Correct 18 ms 17528 KB Output is correct
24 Correct 18 ms 17532 KB Output is correct
25 Correct 18 ms 17528 KB Output is correct
26 Correct 17 ms 17528 KB Output is correct
27 Correct 18 ms 14456 KB Output is correct
28 Correct 18 ms 17528 KB Output is correct
29 Correct 18 ms 17660 KB Output is correct
30 Correct 19 ms 17660 KB Output is correct
31 Correct 18 ms 17656 KB Output is correct
32 Correct 18 ms 17656 KB Output is correct
33 Correct 18 ms 17528 KB Output is correct
34 Correct 17 ms 14456 KB Output is correct
35 Correct 18 ms 17656 KB Output is correct
36 Correct 18 ms 17656 KB Output is correct
37 Correct 21 ms 17656 KB Output is correct
38 Correct 20 ms 17528 KB Output is correct
39 Correct 18 ms 17656 KB Output is correct
40 Correct 18 ms 17656 KB Output is correct
41 Correct 19 ms 17684 KB Output is correct
42 Correct 20 ms 19192 KB Output is correct
43 Correct 19 ms 19192 KB Output is correct
44 Correct 18 ms 17532 KB Output is correct
45 Correct 20 ms 19192 KB Output is correct
46 Correct 18 ms 17656 KB Output is correct
47 Correct 20 ms 17656 KB Output is correct
48 Correct 18 ms 17656 KB Output is correct
49 Correct 18 ms 17528 KB Output is correct
50 Correct 20 ms 17656 KB Output is correct
51 Correct 22 ms 19192 KB Output is correct
52 Correct 18 ms 17656 KB Output is correct
53 Correct 23 ms 19196 KB Output is correct
54 Correct 18 ms 17528 KB Output is correct
55 Correct 18 ms 17528 KB Output is correct
56 Correct 18 ms 17656 KB Output is correct
57 Correct 18 ms 17604 KB Output is correct
58 Correct 21 ms 17656 KB Output is correct
59 Correct 34 ms 17656 KB Output is correct
60 Correct 18 ms 17596 KB Output is correct
61 Correct 21 ms 17528 KB Output is correct
62 Correct 15 ms 14504 KB Output is correct
63 Correct 15 ms 14456 KB Output is correct
64 Correct 18 ms 17528 KB Output is correct
65 Correct 18 ms 17528 KB Output is correct
66 Correct 18 ms 17564 KB Output is correct
67 Correct 19 ms 19192 KB Output is correct
68 Correct 19 ms 19192 KB Output is correct
69 Correct 19 ms 17656 KB Output is correct
70 Correct 23 ms 17784 KB Output is correct
71 Correct 20 ms 19424 KB Output is correct
72 Correct 20 ms 19192 KB Output is correct
73 Correct 18 ms 17528 KB Output is correct
74 Correct 19 ms 19192 KB Output is correct
75 Correct 18 ms 17532 KB Output is correct
76 Correct 18 ms 17656 KB Output is correct
77 Correct 18 ms 17656 KB Output is correct
78 Correct 19 ms 19192 KB Output is correct
79 Correct 20 ms 17528 KB Output is correct
80 Correct 22 ms 17656 KB Output is correct
81 Correct 24 ms 19192 KB Output is correct
82 Correct 21 ms 17528 KB Output is correct
83 Correct 18 ms 17656 KB Output is correct
84 Correct 20 ms 19192 KB Output is correct
85 Correct 18 ms 17656 KB Output is correct
86 Correct 18 ms 17528 KB Output is correct
87 Correct 19 ms 17656 KB Output is correct
88 Correct 19 ms 17528 KB Output is correct
89 Correct 19 ms 19192 KB Output is correct
90 Correct 19 ms 17656 KB Output is correct
91 Correct 20 ms 19180 KB Output is correct
92 Correct 18 ms 17656 KB Output is correct
93 Correct 17 ms 17528 KB Output is correct
94 Correct 15 ms 14456 KB Output is correct
95 Correct 18 ms 17528 KB Output is correct
96 Correct 18 ms 17656 KB Output is correct
97 Correct 20 ms 19240 KB Output is correct
98 Correct 18 ms 17656 KB Output is correct

Subtask #4
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 58 ms 21588 KB Output is correct
2 Correct 20 ms 17528 KB Output is correct
3 Correct 41 ms 22388 KB Output is correct
4 Correct 46 ms 22516 KB Output is correct
5 Correct 179 ms 26360 KB Output is correct
6 Correct 128 ms 27368 KB Output is correct
7 Incorrect 128 ms 27896 KB 'impossible' claimed, but there is a solution
8 Halted 0 ms 0 KB -

Subtask #5
0 / 26.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 17528 KB Output is correct
2 Correct 18 ms 17528 KB Output is correct
3 Correct 18 ms 17528 KB Output is correct
4 Correct 22 ms 17528 KB Output is correct
5 Correct 22 ms 17528 KB Output is correct
6 Correct 21 ms 17656 KB Output is correct
7 Correct 18 ms 17528 KB Output is correct
8 Correct 18 ms 17528 KB Output is correct
9 Correct 42 ms 17656 KB Output is correct
10 Correct 21 ms 17528 KB Output is correct
11 Correct 17 ms 17656 KB Output is correct
12 Correct 22 ms 17656 KB Output is correct
13 Correct 18 ms 17528 KB Output is correct
14 Correct 18 ms 17656 KB Output is correct
15 Correct 19 ms 17528 KB Output is correct
16 Correct 18 ms 17656 KB Output is correct
17 Correct 17 ms 17656 KB Output is correct
18 Correct 18 ms 17656 KB Output is correct
19 Correct 18 ms 17656 KB Output is correct
20 Correct 17 ms 17656 KB Output is correct
21 Correct 18 ms 17656 KB Output is correct
22 Correct 18 ms 17656 KB Output is correct
23 Correct 18 ms 17528 KB Output is correct
24 Correct 18 ms 17532 KB Output is correct
25 Correct 18 ms 17528 KB Output is correct
26 Correct 17 ms 17528 KB Output is correct
27 Correct 18 ms 14456 KB Output is correct
28 Correct 18 ms 17528 KB Output is correct
29 Correct 18 ms 17660 KB Output is correct
30 Correct 19 ms 17660 KB Output is correct
31 Correct 18 ms 17656 KB Output is correct
32 Correct 18 ms 17656 KB Output is correct
33 Correct 18 ms 17528 KB Output is correct
34 Correct 17 ms 14456 KB Output is correct
35 Correct 18 ms 17656 KB Output is correct
36 Correct 18 ms 17656 KB Output is correct
37 Correct 21 ms 17656 KB Output is correct
38 Correct 20 ms 17528 KB Output is correct
39 Correct 18 ms 17656 KB Output is correct
40 Correct 18 ms 17656 KB Output is correct
41 Correct 19 ms 17684 KB Output is correct
42 Correct 20 ms 19192 KB Output is correct
43 Correct 19 ms 19192 KB Output is correct
44 Correct 18 ms 17532 KB Output is correct
45 Correct 20 ms 19192 KB Output is correct
46 Correct 18 ms 17656 KB Output is correct
47 Correct 20 ms 17656 KB Output is correct
48 Correct 18 ms 17656 KB Output is correct
49 Correct 18 ms 17528 KB Output is correct
50 Correct 20 ms 17656 KB Output is correct
51 Correct 22 ms 19192 KB Output is correct
52 Correct 18 ms 17656 KB Output is correct
53 Correct 23 ms 19196 KB Output is correct
54 Correct 18 ms 17528 KB Output is correct
55 Correct 18 ms 17528 KB Output is correct
56 Correct 18 ms 17656 KB Output is correct
57 Correct 18 ms 17604 KB Output is correct
58 Correct 21 ms 17656 KB Output is correct
59 Correct 34 ms 17656 KB Output is correct
60 Correct 18 ms 17596 KB Output is correct
61 Correct 21 ms 17528 KB Output is correct
62 Correct 15 ms 14504 KB Output is correct
63 Correct 15 ms 14456 KB Output is correct
64 Correct 18 ms 17528 KB Output is correct
65 Correct 18 ms 17528 KB Output is correct
66 Correct 18 ms 17564 KB Output is correct
67 Correct 19 ms 19192 KB Output is correct
68 Correct 19 ms 19192 KB Output is correct
69 Correct 19 ms 17656 KB Output is correct
70 Correct 23 ms 17784 KB Output is correct
71 Correct 20 ms 19424 KB Output is correct
72 Correct 20 ms 19192 KB Output is correct
73 Correct 18 ms 17528 KB Output is correct
74 Correct 19 ms 19192 KB Output is correct
75 Correct 18 ms 17532 KB Output is correct
76 Correct 18 ms 17656 KB Output is correct
77 Correct 18 ms 17656 KB Output is correct
78 Correct 19 ms 19192 KB Output is correct
79 Correct 20 ms 17528 KB Output is correct
80 Correct 22 ms 17656 KB Output is correct
81 Correct 24 ms 19192 KB Output is correct
82 Correct 21 ms 17528 KB Output is correct
83 Correct 18 ms 17656 KB Output is correct
84 Correct 20 ms 19192 KB Output is correct
85 Correct 18 ms 17656 KB Output is correct
86 Correct 18 ms 17528 KB Output is correct
87 Correct 19 ms 17656 KB Output is correct
88 Correct 19 ms 17528 KB Output is correct
89 Correct 19 ms 19192 KB Output is correct
90 Correct 19 ms 17656 KB Output is correct
91 Correct 20 ms 19180 KB Output is correct
92 Correct 18 ms 17656 KB Output is correct
93 Correct 17 ms 17528 KB Output is correct
94 Correct 15 ms 14456 KB Output is correct
95 Correct 18 ms 17528 KB Output is correct
96 Correct 18 ms 17656 KB Output is correct
97 Correct 20 ms 19240 KB Output is correct
98 Correct 18 ms 17656 KB Output is correct
99 Correct 58 ms 21588 KB Output is correct
100 Correct 20 ms 17528 KB Output is correct
101 Correct 41 ms 22388 KB Output is correct
102 Correct 46 ms 22516 KB Output is correct
103 Correct 179 ms 26360 KB Output is correct
104 Correct 128 ms 27368 KB Output is correct
105 Incorrect 128 ms 27896 KB 'impossible' claimed, but there is a solution
106 Halted 0 ms 0 KB -