oj.uz

Submission #1072030

# Submission time Handle Problem Language Result Execution time Memory
1072030 2024-08-23T13:32:13 Z belgianbot Graph (BOI20_graph) C++17
100 / 100
 113 ms 14280 KB 
#include <bits/stdc++.h>
#define fi first
#define se second

using namespace std;

vector<vector<pair<int,int>>> adj;
vector<bool> processed;

double merge(pair<int,int> a, pair<int,int> b) {
    double nb = a.fi - b.fi;
    double nbX = b.se - a.se;
    if (!nbX) {
        if (!nb) return INT_MAX;
        else return INT_MIN;
    }
    return nb / nbX;
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int N, M; cin >> N >> M;
    adj.resize(N);

    for (int i = 0; i < M; i++) {
        int a, b, c; cin >> a >> b >> c;
        a--, b--;;
        adj[a].push_back({b, c});
        adj[b].push_back({a, c});
    }
 
    vector<double> ans(N, INT_MAX);
    vector<pair<int,int>> value(N, {INT_MAX, INT_MAX});
    processed.resize(N, false);
    
    for (int i = 0; i < N; i++) {
        if (processed[i]) continue;

        vector<int> in = {i};
        double equation = INT_MAX;
        queue<int> q; q.push(i);
        processed[i] = true;
        value[i] = {0, 1};

        while (!q.empty()) {
            int x = q.front(); q.pop();
            for (auto [y, c] : adj[x]) {
                if (processed[y]) {
                    double sol = merge(value[y], {c - value[x].fi, -value[x].se});
                    if (sol == INT_MIN || (sol != INT_MAX && equation != sol && equation != INT_MAX)) {
                        cout << "NO\n";
                        return 0;
                    }
                    else if (sol != INT_MAX) equation = sol;
                }
                else {
                    processed[y] = true;
                    in.push_back(y);
                    value[y] = {c - value[x].fi, -value[x].se};
                    q.push(y);
                }
            }
        }

        if (equation == INT_MAX) {
            double l = -1000000.0, r = 1000000.0;
            double best, sum = INT_MAX;
            while (r - l > 0.000001) {
                double mid1 = l + (r - l) / 3.0, mid2 = r - (r - l) / 3.0;

                double res1 = 0.0, res2 = 0.0;
                for (int x : in) {
                    res1 += abs(value[x].fi + value[x].se * mid1);
                    res2 += abs(value[x].fi + value[x].se * mid2);
                }
                if (res1 < res2) {
                    r = mid2;
                    if (res1 < sum) {best = mid1; sum = res1;}
                }
                else {
                    l = mid1;
                    if (res2 < sum) {best = mid2;sum = res2;}
                }
            }
            equation = best;
        }
        for (int x : in) ans[x] = value[x].fi + equation * value[x].se;
    }
        

    cout << "YES\n";
    for (double x : ans) {
        cout << setprecision(6) << fixed << x << " ";
    }
    return 0;
}

Compilation message

Graph.cpp: In function 'int main()':
Graph.cpp:87:58: warning: 'best' may be used uninitialized in this function [-Wmaybe-uninitialized]
   87 |         for (int x : in) ans[x] = value[x].fi + equation * value[x].se;
      |                                                          ^

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB answer = YES
2 Correct 0 ms 348 KB answer = YES
3 Correct 0 ms 452 KB answer = YES
4 Correct 0 ms 348 KB answer = NO
5 Correct 0 ms 348 KB answer = YES
6 Correct 0 ms 348 KB answer = YES
7 Correct 0 ms 348 KB answer = YES
8 Correct 1 ms 348 KB answer = YES
9 Correct 0 ms 348 KB answer = NO
10 Correct 0 ms 348 KB answer = YES
11 Correct 1 ms 348 KB answer = YES
12 Correct 0 ms 348 KB answer = NO
13 Correct 0 ms 348 KB answer = YES
14 Correct 0 ms 348 KB answer = YES
15 Correct 0 ms 348 KB answer = YES
16 Correct 0 ms 348 KB answer = YES
17 Correct 0 ms 348 KB answer = YES
18 Correct 0 ms 348 KB answer = YES
19 Correct 0 ms 348 KB answer = YES
20 Correct 0 ms 348 KB answer = YES
21 Correct 0 ms 348 KB answer = YES
22 Correct 1 ms 348 KB answer = NO
23 Correct 0 ms 348 KB answer = NO

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB answer = YES
2 Correct 0 ms 348 KB answer = YES
3 Correct 0 ms 452 KB answer = YES
4 Correct 0 ms 348 KB answer = NO
5 Correct 0 ms 348 KB answer = YES
6 Correct 0 ms 348 KB answer = YES
7 Correct 0 ms 348 KB answer = YES
8 Correct 1 ms 348 KB answer = YES
9 Correct 0 ms 348 KB answer = NO
10 Correct 0 ms 348 KB answer = YES
11 Correct 1 ms 348 KB answer = YES
12 Correct 0 ms 348 KB answer = NO
13 Correct 0 ms 348 KB answer = YES
14 Correct 0 ms 348 KB answer = YES
15 Correct 0 ms 348 KB answer = YES
16 Correct 0 ms 348 KB answer = YES
17 Correct 0 ms 348 KB answer = YES
18 Correct 0 ms 348 KB answer = YES
19 Correct 0 ms 348 KB answer = YES
20 Correct 0 ms 348 KB answer = YES
21 Correct 0 ms 348 KB answer = YES
22 Correct 1 ms 348 KB answer = NO
23 Correct 0 ms 348 KB answer = NO
24 Correct 0 ms 344 KB answer = YES
25 Correct 1 ms 348 KB answer = YES
26 Correct 0 ms 348 KB answer = YES
27 Correct 0 ms 348 KB answer = YES
28 Correct 0 ms 348 KB answer = YES
29 Correct 0 ms 348 KB answer = YES
30 Correct 0 ms 348 KB answer = NO
31 Correct 0 ms 348 KB answer = YES
32 Correct 0 ms 348 KB answer = YES
33 Correct 1 ms 348 KB answer = YES
34 Correct 1 ms 384 KB answer = YES
35 Correct 1 ms 348 KB answer = YES
36 Correct 0 ms 348 KB answer = YES

Subtask #3
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB answer = YES
2 Correct 0 ms 348 KB answer = YES
3 Correct 0 ms 452 KB answer = YES
4 Correct 0 ms 348 KB answer = NO
5 Correct 0 ms 348 KB answer = YES
6 Correct 0 ms 348 KB answer = YES
7 Correct 0 ms 348 KB answer = YES
8 Correct 1 ms 348 KB answer = YES
9 Correct 0 ms 348 KB answer = NO
10 Correct 0 ms 348 KB answer = YES
11 Correct 1 ms 348 KB answer = YES
12 Correct 0 ms 348 KB answer = NO
13 Correct 0 ms 348 KB answer = YES
14 Correct 0 ms 348 KB answer = YES
15 Correct 0 ms 348 KB answer = YES
16 Correct 0 ms 348 KB answer = YES
17 Correct 0 ms 348 KB answer = YES
18 Correct 0 ms 348 KB answer = YES
19 Correct 0 ms 348 KB answer = YES
20 Correct 0 ms 348 KB answer = YES
21 Correct 0 ms 348 KB answer = YES
22 Correct 1 ms 348 KB answer = NO
23 Correct 0 ms 348 KB answer = NO
24 Correct 0 ms 344 KB answer = YES
25 Correct 1 ms 348 KB answer = YES
26 Correct 0 ms 348 KB answer = YES
27 Correct 0 ms 348 KB answer = YES
28 Correct 0 ms 348 KB answer = YES
29 Correct 0 ms 348 KB answer = YES
30 Correct 0 ms 348 KB answer = NO
31 Correct 0 ms 348 KB answer = YES
32 Correct 0 ms 348 KB answer = YES
33 Correct 1 ms 348 KB answer = YES
34 Correct 1 ms 384 KB answer = YES
35 Correct 1 ms 348 KB answer = YES
36 Correct 0 ms 348 KB answer = YES
37 Correct 1 ms 348 KB answer = YES
38 Correct 0 ms 348 KB answer = YES
39 Correct 1 ms 344 KB answer = YES
40 Correct 1 ms 348 KB answer = YES
41 Correct 0 ms 348 KB answer = NO
42 Correct 1 ms 348 KB answer = YES
43 Correct 1 ms 348 KB answer = YES
44 Correct 1 ms 348 KB answer = YES
45 Correct 1 ms 348 KB answer = YES
46 Correct 1 ms 348 KB answer = YES
47 Correct 1 ms 348 KB answer = YES
48 Correct 1 ms 348 KB answer = YES

Subtask #4
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB answer = YES
2 Correct 0 ms 348 KB answer = YES
3 Correct 0 ms 452 KB answer = YES
4 Correct 0 ms 348 KB answer = NO
5 Correct 0 ms 348 KB answer = YES
6 Correct 0 ms 348 KB answer = YES
7 Correct 0 ms 348 KB answer = YES
8 Correct 1 ms 348 KB answer = YES
9 Correct 0 ms 348 KB answer = NO
10 Correct 0 ms 348 KB answer = YES
11 Correct 1 ms 348 KB answer = YES
12 Correct 0 ms 348 KB answer = NO
13 Correct 0 ms 348 KB answer = YES
14 Correct 0 ms 348 KB answer = YES
15 Correct 0 ms 348 KB answer = YES
16 Correct 0 ms 348 KB answer = YES
17 Correct 0 ms 348 KB answer = YES
18 Correct 0 ms 348 KB answer = YES
19 Correct 0 ms 348 KB answer = YES
20 Correct 0 ms 348 KB answer = YES
21 Correct 0 ms 348 KB answer = YES
22 Correct 1 ms 348 KB answer = NO
23 Correct 0 ms 348 KB answer = NO
24 Correct 0 ms 344 KB answer = YES
25 Correct 1 ms 348 KB answer = YES
26 Correct 0 ms 348 KB answer = YES
27 Correct 0 ms 348 KB answer = YES
28 Correct 0 ms 348 KB answer = YES
29 Correct 0 ms 348 KB answer = YES
30 Correct 0 ms 348 KB answer = NO
31 Correct 0 ms 348 KB answer = YES
32 Correct 0 ms 348 KB answer = YES
33 Correct 1 ms 348 KB answer = YES
34 Correct 1 ms 384 KB answer = YES
35 Correct 1 ms 348 KB answer = YES
36 Correct 0 ms 348 KB answer = YES
37 Correct 1 ms 348 KB answer = YES
38 Correct 0 ms 348 KB answer = YES
39 Correct 1 ms 344 KB answer = YES
40 Correct 1 ms 348 KB answer = YES
41 Correct 0 ms 348 KB answer = NO
42 Correct 1 ms 348 KB answer = YES
43 Correct 1 ms 348 KB answer = YES
44 Correct 1 ms 348 KB answer = YES
45 Correct 1 ms 348 KB answer = YES
46 Correct 1 ms 348 KB answer = YES
47 Correct 1 ms 348 KB answer = YES
48 Correct 1 ms 348 KB answer = YES
49 Correct 7 ms 1372 KB answer = YES
50 Correct 10 ms 1372 KB answer = YES
51 Correct 6 ms 1400 KB answer = YES
52 Correct 3 ms 1116 KB answer = NO
53 Correct 2 ms 348 KB answer = YES
54 Correct 2 ms 604 KB answer = YES
55 Correct 3 ms 860 KB answer = YES
56 Correct 8 ms 1440 KB answer = YES
57 Correct 7 ms 1444 KB answer = YES
58 Correct 11 ms 1372 KB answer = YES
59 Correct 9 ms 1368 KB answer = YES
60 Correct 7 ms 1372 KB answer = YES
61 Correct 5 ms 860 KB answer = YES
62 Correct 35 ms 7252 KB answer = NO
63 Correct 44 ms 7788 KB answer = YES
64 Correct 37 ms 7740 KB answer = NO
65 Correct 40 ms 7760 KB answer = YES
66 Correct 2 ms 604 KB answer = YES

Subtask #5
42.0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB answer = YES
2 Correct 0 ms 348 KB answer = YES
3 Correct 0 ms 452 KB answer = YES
4 Correct 0 ms 348 KB answer = NO
5 Correct 0 ms 348 KB answer = YES
6 Correct 0 ms 348 KB answer = YES
7 Correct 0 ms 348 KB answer = YES
8 Correct 1 ms 348 KB answer = YES
9 Correct 0 ms 348 KB answer = NO
10 Correct 0 ms 348 KB answer = YES
11 Correct 1 ms 348 KB answer = YES
12 Correct 0 ms 348 KB answer = NO
13 Correct 0 ms 348 KB answer = YES
14 Correct 0 ms 348 KB answer = YES
15 Correct 0 ms 348 KB answer = YES
16 Correct 0 ms 348 KB answer = YES
17 Correct 0 ms 348 KB answer = YES
18 Correct 0 ms 348 KB answer = YES
19 Correct 0 ms 348 KB answer = YES
20 Correct 0 ms 348 KB answer = YES
21 Correct 0 ms 348 KB answer = YES
22 Correct 1 ms 348 KB answer = NO
23 Correct 0 ms 348 KB answer = NO
24 Correct 0 ms 344 KB answer = YES
25 Correct 1 ms 348 KB answer = YES
26 Correct 0 ms 348 KB answer = YES
27 Correct 0 ms 348 KB answer = YES
28 Correct 0 ms 348 KB answer = YES
29 Correct 0 ms 348 KB answer = YES
30 Correct 0 ms 348 KB answer = NO
31 Correct 0 ms 348 KB answer = YES
32 Correct 0 ms 348 KB answer = YES
33 Correct 1 ms 348 KB answer = YES
34 Correct 1 ms 384 KB answer = YES
35 Correct 1 ms 348 KB answer = YES
36 Correct 0 ms 348 KB answer = YES
37 Correct 1 ms 348 KB answer = YES
38 Correct 0 ms 348 KB answer = YES
39 Correct 1 ms 344 KB answer = YES
40 Correct 1 ms 348 KB answer = YES
41 Correct 0 ms 348 KB answer = NO
42 Correct 1 ms 348 KB answer = YES
43 Correct 1 ms 348 KB answer = YES
44 Correct 1 ms 348 KB answer = YES
45 Correct 1 ms 348 KB answer = YES
46 Correct 1 ms 348 KB answer = YES
47 Correct 1 ms 348 KB answer = YES
48 Correct 1 ms 348 KB answer = YES
49 Correct 7 ms 1372 KB answer = YES
50 Correct 10 ms 1372 KB answer = YES
51 Correct 6 ms 1400 KB answer = YES
52 Correct 3 ms 1116 KB answer = NO
53 Correct 2 ms 348 KB answer = YES
54 Correct 2 ms 604 KB answer = YES
55 Correct 3 ms 860 KB answer = YES
56 Correct 8 ms 1440 KB answer = YES
57 Correct 7 ms 1444 KB answer = YES
58 Correct 11 ms 1372 KB answer = YES
59 Correct 9 ms 1368 KB answer = YES
60 Correct 7 ms 1372 KB answer = YES
61 Correct 5 ms 860 KB answer = YES
62 Correct 35 ms 7252 KB answer = NO
63 Correct 44 ms 7788 KB answer = YES
64 Correct 37 ms 7740 KB answer = NO
65 Correct 40 ms 7760 KB answer = YES
66 Correct 2 ms 604 KB answer = YES
67 Correct 64 ms 9944 KB answer = YES
68 Correct 65 ms 9756 KB answer = YES
69 Correct 48 ms 9860 KB answer = YES
70 Correct 65 ms 14280 KB answer = YES
71 Correct 50 ms 9688 KB answer = YES
72 Correct 76 ms 10304 KB answer = YES
73 Correct 61 ms 10484 KB answer = YES
74 Correct 41 ms 6516 KB answer = YES
75 Correct 22 ms 6224 KB answer = NO
76 Correct 12 ms 1684 KB answer = YES
77 Correct 16 ms 2968 KB answer = YES
78 Correct 48 ms 4740 KB answer = YES
79 Correct 87 ms 9068 KB answer = YES
80 Correct 84 ms 6604 KB answer = YES
81 Correct 25 ms 8856 KB answer = NO
82 Correct 59 ms 9800 KB answer = YES
83 Correct 63 ms 10052 KB answer = YES
84 Correct 113 ms 9796 KB answer = YES
85 Correct 66 ms 9800 KB answer = YES
86 Correct 56 ms 9804 KB answer = YES
87 Correct 29 ms 9048 KB answer = NO
88 Correct 65 ms 10008 KB answer = YES
89 Correct 55 ms 9548 KB answer = YES
90 Correct 95 ms 9624 KB answer = YES
91 Correct 56 ms 9560 KB answer = YES
92 Correct 33 ms 5508 KB answer = YES
93 Correct 27 ms 5548 KB answer = YES
94 Correct 29 ms 9428 KB answer = NO
95 Correct 27 ms 8796 KB answer = NO
96 Correct 105 ms 14244 KB answer = YES
97 Correct 29 ms 9344 KB answer = NO