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Submission #702214

# Submission time Handle Problem Language Result Execution time Memory
702214 2023-02-23T10:24:57 Z lovrot Stranded Far From Home (BOI22_island) C++17
100 / 100
 179 ms 24684 KB 
#include <vector>
#include <cstdio>
#include <algorithm>

#define X first
#define Y second
#define pb push_back

using namespace std; 

typedef long long ll; 
typedef pair<int, int> pii; 
typedef pair<ll, ll> pll; 

const int N = 2e5 + 10; 

int n, m, to[N], U[N], sol[N];
ll S[N], SUM[N];

vector<int> g[N]; 
vector<pair<ll, int>> p; 

int Find(int u) {
	if(u == U[u]) return u; 
	return U[u] = Find(U[u]); 
}

void Union(int u, int v) {
	u = Find(u); 
	v = Find(v); 
	if(u == v) return;
	U[v] = u; 
	SUM[u] += SUM[v]; 
	if(!to[v] || S[to[v]] == S[v]) to[v] = u; 
}

int main() {
	for(int i = 0; i < N; i++) U[i] = i;

	scanf("%d%d", &n, &m); 

	for(int i = 1; i <= n; i++) {
		scanf("%lld", S + i); 
		p.pb({S[i], i}); 
	}

	sort(p.begin(), p.end()); 

	for(int i = 0; i < m; i++) {
		int u, v; 
		scanf("%d%d", &u, &v); 
		if(S[u] < S[v] || S[u] == S[v] && u < v) swap(u, v);
		g[u].pb(v); 
	}

	for(pair<ll, int> u : p) {
		SUM[u.Y] = S[u.Y]; 
		for(int v : g[u.Y]) Union(u.Y, v); 
	}

	reverse(p.begin(), p.end()); 
	to[p[0].Y] = 0; 
	SUM[0] = 0; 
	sol[0] = 1;

	for(pair<ll, int> u : p)
		if(sol[to[u.Y]] && SUM[u.Y] >= S[to[u.Y]]) sol[u.Y] = true; 

	for(int i = 1; i <= n; i++) printf("%d", sol[i]); 
	printf("\n");
	return 0;
}

Compilation message

island.cpp: In function 'int main()':
island.cpp:52:34: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   52 |   if(S[u] < S[v] || S[u] == S[v] && u < v) swap(u, v);
      |                     ~~~~~~~~~~~~~^~~~~~~~
island.cpp:40:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |  scanf("%d%d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~
island.cpp:43:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |   scanf("%lld", S + i);
      |   ~~~~~^~~~~~~~~~~~~~~
island.cpp:51:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |   scanf("%d%d", &u, &v);
      |   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5716 KB Output is correct
2 Correct 3 ms 5716 KB Output is correct
3 Correct 3 ms 5788 KB Output is correct
4 Correct 4 ms 5844 KB Output is correct
5 Correct 4 ms 5920 KB Output is correct
6 Correct 4 ms 5844 KB Output is correct
7 Correct 4 ms 5864 KB Output is correct
8 Correct 5 ms 5844 KB Output is correct
9 Correct 4 ms 5844 KB Output is correct
10 Correct 5 ms 5844 KB Output is correct
11 Correct 4 ms 5844 KB Output is correct
12 Correct 4 ms 5908 KB Output is correct
13 Correct 4 ms 5916 KB Output is correct
14 Correct 5 ms 5892 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5780 KB Output is correct
2 Correct 3 ms 5716 KB Output is correct
3 Correct 128 ms 18600 KB Output is correct
4 Correct 129 ms 20992 KB Output is correct
5 Correct 131 ms 17776 KB Output is correct
6 Correct 158 ms 18096 KB Output is correct
7 Correct 130 ms 18160 KB Output is correct
8 Correct 146 ms 20572 KB Output is correct
9 Correct 116 ms 16928 KB Output is correct
10 Correct 93 ms 15272 KB Output is correct
11 Correct 148 ms 20468 KB Output is correct
12 Correct 134 ms 19248 KB Output is correct
13 Correct 140 ms 22280 KB Output is correct
14 Correct 153 ms 22152 KB Output is correct
15 Correct 131 ms 20520 KB Output is correct
16 Correct 97 ms 20412 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5716 KB Output is correct
2 Correct 169 ms 18344 KB Output is correct
3 Correct 167 ms 18468 KB Output is correct
4 Correct 160 ms 20472 KB Output is correct
5 Correct 131 ms 20564 KB Output is correct
6 Correct 159 ms 18396 KB Output is correct
7 Correct 148 ms 20536 KB Output is correct
8 Correct 149 ms 20480 KB Output is correct
9 Correct 101 ms 20356 KB Output is correct
10 Correct 132 ms 18692 KB Output is correct
11 Correct 163 ms 18336 KB Output is correct

Subtask #4
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5716 KB Output is correct
2 Correct 171 ms 18160 KB Output is correct
3 Correct 162 ms 22024 KB Output is correct
4 Correct 179 ms 22112 KB Output is correct
5 Correct 151 ms 22172 KB Output is correct
6 Correct 135 ms 21540 KB Output is correct
7 Correct 112 ms 21984 KB Output is correct
8 Correct 97 ms 24200 KB Output is correct
9 Correct 97 ms 15204 KB Output is correct
10 Correct 126 ms 19860 KB Output is correct
11 Correct 146 ms 20712 KB Output is correct

Subtask #5
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5716 KB Output is correct
2 Correct 3 ms 5716 KB Output is correct
3 Correct 3 ms 5788 KB Output is correct
4 Correct 4 ms 5844 KB Output is correct
5 Correct 4 ms 5920 KB Output is correct
6 Correct 4 ms 5844 KB Output is correct
7 Correct 4 ms 5864 KB Output is correct
8 Correct 5 ms 5844 KB Output is correct
9 Correct 4 ms 5844 KB Output is correct
10 Correct 5 ms 5844 KB Output is correct
11 Correct 4 ms 5844 KB Output is correct
12 Correct 4 ms 5908 KB Output is correct
13 Correct 4 ms 5916 KB Output is correct
14 Correct 5 ms 5892 KB Output is correct
15 Correct 3 ms 5780 KB Output is correct
16 Correct 3 ms 5716 KB Output is correct
17 Correct 128 ms 18600 KB Output is correct
18 Correct 129 ms 20992 KB Output is correct
19 Correct 131 ms 17776 KB Output is correct
20 Correct 158 ms 18096 KB Output is correct
21 Correct 130 ms 18160 KB Output is correct
22 Correct 146 ms 20572 KB Output is correct
23 Correct 116 ms 16928 KB Output is correct
24 Correct 93 ms 15272 KB Output is correct
25 Correct 148 ms 20468 KB Output is correct
26 Correct 134 ms 19248 KB Output is correct
27 Correct 140 ms 22280 KB Output is correct
28 Correct 153 ms 22152 KB Output is correct
29 Correct 131 ms 20520 KB Output is correct
30 Correct 97 ms 20412 KB Output is correct
31 Correct 3 ms 5716 KB Output is correct
32 Correct 169 ms 18344 KB Output is correct
33 Correct 167 ms 18468 KB Output is correct
34 Correct 160 ms 20472 KB Output is correct
35 Correct 131 ms 20564 KB Output is correct
36 Correct 159 ms 18396 KB Output is correct
37 Correct 148 ms 20536 KB Output is correct
38 Correct 149 ms 20480 KB Output is correct
39 Correct 101 ms 20356 KB Output is correct
40 Correct 132 ms 18692 KB Output is correct
41 Correct 163 ms 18336 KB Output is correct
42 Correct 3 ms 5716 KB Output is correct
43 Correct 171 ms 18160 KB Output is correct
44 Correct 162 ms 22024 KB Output is correct
45 Correct 179 ms 22112 KB Output is correct
46 Correct 151 ms 22172 KB Output is correct
47 Correct 135 ms 21540 KB Output is correct
48 Correct 112 ms 21984 KB Output is correct
49 Correct 97 ms 24200 KB Output is correct
50 Correct 97 ms 15204 KB Output is correct
51 Correct 126 ms 19860 KB Output is correct
52 Correct 146 ms 20712 KB Output is correct
53 Correct 3 ms 5788 KB Output is correct
54 Correct 3 ms 5704 KB Output is correct
55 Correct 4 ms 5780 KB Output is correct
56 Correct 4 ms 5844 KB Output is correct
57 Correct 4 ms 5920 KB Output is correct
58 Correct 4 ms 5844 KB Output is correct
59 Correct 4 ms 5844 KB Output is correct
60 Correct 4 ms 5792 KB Output is correct
61 Correct 4 ms 5924 KB Output is correct
62 Correct 5 ms 5924 KB Output is correct
63 Correct 4 ms 5924 KB Output is correct
64 Correct 4 ms 5928 KB Output is correct
65 Correct 4 ms 5920 KB Output is correct
66 Correct 4 ms 5844 KB Output is correct
67 Correct 129 ms 22464 KB Output is correct
68 Correct 135 ms 23516 KB Output is correct
69 Correct 133 ms 21528 KB Output is correct
70 Correct 137 ms 21968 KB Output is correct
71 Correct 130 ms 22020 KB Output is correct
72 Correct 149 ms 24436 KB Output is correct
73 Correct 116 ms 20760 KB Output is correct
74 Correct 96 ms 18288 KB Output is correct
75 Correct 138 ms 23396 KB Output is correct
76 Correct 137 ms 22012 KB Output is correct
77 Correct 129 ms 24684 KB Output is correct
78 Correct 133 ms 24668 KB Output is correct
79 Correct 130 ms 24436 KB Output is correct
80 Correct 95 ms 23528 KB Output is correct
81 Correct 161 ms 22268 KB Output is correct
82 Correct 163 ms 22284 KB Output is correct
83 Correct 155 ms 24496 KB Output is correct
84 Correct 139 ms 23076 KB Output is correct
85 Correct 159 ms 22344 KB Output is correct
86 Correct 156 ms 24500 KB Output is correct
87 Correct 149 ms 24396 KB Output is correct
88 Correct 136 ms 21924 KB Output is correct
89 Correct 140 ms 20724 KB Output is correct
90 Correct 168 ms 22112 KB Output is correct
91 Correct 162 ms 22092 KB Output is correct
92 Correct 166 ms 22120 KB Output is correct
93 Correct 155 ms 22188 KB Output is correct
94 Correct 160 ms 21500 KB Output is correct
95 Correct 122 ms 22016 KB Output is correct
96 Correct 99 ms 24240 KB Output is correct
97 Correct 100 ms 15168 KB Output is correct
98 Correct 123 ms 19840 KB Output is correct
99 Correct 138 ms 20696 KB Output is correct
100 Correct 63 ms 9164 KB Output is correct
101 Correct 173 ms 22204 KB Output is correct
102 Correct 143 ms 19256 KB Output is correct
103 Correct 153 ms 20016 KB Output is correct
104 Correct 179 ms 21956 KB Output is correct