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#678313#8760. 不等式QSteve_PaulML 1ms3816kbC++231.7kb2024-10-26 14:37:312024-10-26 14:37:33

Judging History

你现在查看的是最新测评结果

  • [2024-10-26 14:37:33]
  • 评测
  • 测评结果：ML
  • 用时：1ms
  • 内存：3816kb
查看
  • [2024-10-26 14:37:31]
  • 提交

answer

#include <bits/stdc++.h>

using namespace std;
using i64 = long long;

void solve()
{
    int n, m;
    cin >> n >> m;
    vector<vector<int>> v(n + 1);
    vector<vector<pair<int, int>>> g(n + 1);
    for (int i = 1; i <= m; i++)
    {
        int x, y, z;
        cin >> x >> y >> z;
        v[x].emplace_back(y);
        v[x].emplace_back(z);
        g[x].emplace_back(y, z);
    }

    for (int i = 1; i <= n; i++)
        sort(v[i].begin(), v[i].end());

    for (int i = 1; i <= n; i++)
    {
        for (const int &nei : v[i])
        {
            if (binary_search(v[nei].begin(), v[nei].end(), i))
            {
                cout << -1 << "\n";
                return;
            }
        }
    }

    bool isok = true;

    vector<i64> ans(n + 1);

    function<void(int)> dfs = [&](int x) {
        if (ans[x] || !isok)
            return;
        i64 mx = 1;
        for (const auto &[y, z] : g[x])
        {
            dfs(y);
            dfs(z);
            mx = max(mx, ans[y] + ans[z]);
        }
        ans[x] = mx;
        if (ans[x] > 1e9)
            isok = false;
    };

    for (int i = 1; i <= n; i++)
        dfs(i);

    if (!isok)
    {
        cout << -1 << "\n";
        return;
    }
    i64 res = accumulate(ans.begin() + 1, ans.begin() + n + 1, 0LL);
    if (res > 1e9)
    {
        cout << -1 << "\n";
        return;
    }
    cout << res << "\n";
}

int main()
{
#ifdef lijn
    freopen("/home/lijn/acm_practice/.build/input.in", "r", stdin);
    freopen("/home/lijn/acm_practice/.build/output.out", "w", stdout);
#endif
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int t = 1;
    // cin >> t;
    while (t--)
        solve();
}
源文件, 语言: C++23

詳細信息

Test #1:

score: 100
Accepted
time: 0ms
memory: 3528kb

input:

3 1
1 2 2

output:

4

result:

ok 1 number(s): "4"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3628kb

input:

3 1
1 2 3

output:

4

result:

ok 1 number(s): "4"

Test #3:

score: 0
Accepted
time: 0ms
memory: 3816kb

input:

3 1
1 2 2

output:

4

result:

ok 1 number(s): "4"

Test #4:

score: 0
Accepted
time: 0ms
memory: 3628kb

input:

3 1
1 2 2

output:

4

result:

ok 1 number(s): "4"

Test #5:

score: 0
Accepted
time: 0ms
memory: 3816kb

input:

3 1
1 2 2

output:

4

result:

ok 1 number(s): "4"

Test #6:

score: 0
Accepted
time: 0ms
memory: 3728kb

input:

5 1
1 2 2

output:

6

result:

ok 1 number(s): "6"

Test #7:

score: 0
Accepted
time: 0ms
memory: 3520kb

input:

5 1
1 2 2

output:

6

result:

ok 1 number(s): "6"

Test #8:

score: 0
Accepted
time: 0ms
memory: 3736kb

input:

5 1
1 2 2

output:

6

result:

ok 1 number(s): "6"

Test #9:

score: 0
Accepted
time: 0ms
memory: 3624kb

input:

5 1
1 2 3

output:

6

result:

ok 1 number(s): "6"

Test #10:

score: 0
Accepted
time: 0ms
memory: 3608kb

input:

5 2
1 2 3
2 3 4

output:

8

result:

ok 1 number(s): "8"

Test #11:

score: 0
Accepted
time: 0ms
memory: 3536kb

input:

10 1
1 2 3

output:

11

result:

ok 1 number(s): "11"

Test #12:

score: 0
Accepted
time: 0ms
memory: 3632kb

input:

10 1
1 2 2

output:

11

result:

ok 1 number(s): "11"

Test #13:

score: 0
Accepted
time: 0ms
memory: 3476kb

input:

10 2
1 2 3
2 3 4

output:

13

result:

ok 1 number(s): "13"

Test #14:

score: 0
Accepted
time: 0ms
memory: 3816kb

input:

10 2
1 2 2
2 3 4

output:

14

result:

ok 1 number(s): "14"

Test #15:

score: 0
Accepted
time: 0ms
memory: 3532kb

input:

10 3
1 2 3
1 8 8
2 3 3

output:

13

result:

ok 1 number(s): "13"

Test #16:

score: 0
Accepted
time: 0ms
memory: 3812kb

input:

20 1
1 2 2

output:

21

result:

ok 1 number(s): "21"

Test #17:

score: 0
Accepted
time: 0ms
memory: 3596kb

input:

20 2
1 2 3
2 3 3

output:

23

result:

ok 1 number(s): "23"

Test #18:

score: 0
Accepted
time: 0ms
memory: 3528kb

input:

20 3
7 14 6
1 2 3
4 7 20

output:

24

result:

ok 1 number(s): "24"

Test #19:

score: 0
Accepted
time: 0ms
memory: 3520kb

input:

20 4
1 2 2
6 10 6
2 3 3
3 4 5

output:

-1

result:

ok 1 number(s): "-1"

Test #20:

score: 0
Accepted
time: 0ms
memory: 3540kb

input:

20 5
1 17 3
1 2 3
2 3 4
3 4 5
8 13 16

output:

28

result:

ok 1 number(s): "28"

Test #21:

score: 0
Accepted
time: 1ms
memory: 3548kb

input:

200 9
1 2 2
2 3 3
3 4 5
91 112 195
126 145 82
4 5 5
53 2 15
5 6 6
6 7 7

output:

318

result:

ok 1 number(s): "318"

Test #22:

score: 0
Accepted
time: 0ms
memory: 3612kb

input:

200 17
1 2 2
100 69 47
159 84 111
2 3 3
3 4 5
4 5 5
8 9 76
5 6 7
158 81 154
189 62 45
192 159 181
6 7 7
15 181 91
7 193 152
140 65 66
7 8 9
32 157 67

output:

428

result:

ok 1 number(s): "428"

Test #23:

score: 0
Accepted
time: 0ms
memory: 3540kb

input:

200 25
118 152 40
172 193 173
126 32 89
1 2 3
147 148 112
2 3 4
3 4 4
35 116 95
179 193 64
70 22 55
4 5 5
5 6 6
24 74 182
184 168 129
6 7 8
7 8 9
109 63 173
8 9 10
38 125 106
68 147 40
33 65 46
144 12 168
9 10 11
10 11 11
190 73 48

output:

835

result:

ok 1 number(s): "835"

Test #24:

score: 0
Accepted
time: 0ms
memory: 3604kb

input:

200 33
1 2 3
165 80 199
2 3 4
10 80 12
3 4 5
4 5 6
5 6 7
128 1 190
6 7 7
166 124 95
7 8 9
60 51 80
25 158 81
108 107 99
8 9 9
9 10 10
10 11 12
54 41 100
11 12 13
176 185 149
12 13 13
13 14 14
14 15 16
15 16 17
16 17 17
128 73 196
17 18 19
93 169 141
18 19 19
19 20 20
20 21 21
21 22 22
12 55 32

output:

543121

result:

ok 1 number(s): "543121"

Test #25:

score: -100
Memory Limit Exceeded

input:

200 41
1 2 3
2 3 3
3 4 4
4 5 5
175 3 161
5 6 7
6 7 8
7 8 9
8 9 10
9 10 10
10 11 11
24 15 157
82 57 72
161 48 197
149 96 16
30 3 131
165 114 21
143 110 56
11 12 12
12 13 13
13 14 14
62 183 153
14 15 15
15 16 16
192 139 91
178 54 86
16 17 18
158 59 18
17 18 19
35 91 197
18 19 20
99 129 43
168 76 146
7...

output:

result:
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