Submission #1219761


Source Code Expand

#include <bits/stdc++.h>

using namespace std;

//#define FILE_IO

int N;
vector <int> edg[100005];
int h[100005], sz[100005];
int cntr[100005];

void DFS(int nod, int fth)
{
    h[nod] = 1 + h[fth];
    sz[nod] = 1;
    for(auto nxt: edg[nod])
        if(nxt != fth && !cntr[nxt])
        {
            DFS(nxt, nod);
            sz[nod] += sz[nxt];
        }
}

int getCentroid(int nod, int szmax)
{
    for(auto nxt: edg[nod])
        if(sz[nod] > sz[nxt] && sz[nxt] > szmax)
            return getCentroid(nxt, szmax);
    return nod;
}

int solve(int nod)
{
    DFS(nod, 0);
    if(sz[nod] == 1)    return 0;
    int root = getCentroid(nod, sz[nod] / 2);
    cntr[root] = 1;

    int ans = 0;
    for(auto nxt: edg[root])
        if(!cntr[nxt])
        {
            int hh = solve(nxt);
            ans = max(ans, hh);
        }
    ans++;
    return ans;
}

int main()
{
    #ifdef FILE_IO
    freopen("1.in", "r", stdin);
    freopen("1.out", "w", stdout);
    #endif

    scanf("%d", &N);
    for(int i = 1; i < N; i++)
    {
        int x, y;
        scanf("%d%d", &x, &y);
        edg[x].push_back(y);
        edg[y].push_back(x);
    }

    int ans = solve(1);
    printf("%d\n", ans);

    return 0;
}

Submission Info

Submission Time
Task D - Uninity
User bogdan10bos
Language C++14 (GCC 5.4.1)
Score 0
Code Size 1285 Byte
Status WA
Exec Time 129 ms
Memory 11392 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:57:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &N);
                    ^
./Main.cpp:61:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &x, &y);
                              ^

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 0 / 1400
Status
AC × 2
AC × 42
WA × 32
Set Name Test Cases
Sample s1.txt, s2.txt
All 01.txt, 02.txt, 03.txt, 04.txt, 05.txt, 06.txt, 07.txt, 08.txt, 09.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 20.txt, 21.txt, 22.txt, 23.txt, 24.txt, 25.txt, 26.txt, 27.txt, 28.txt, 29.txt, 30.txt, 31.txt, 32.txt, 33.txt, 34.txt, 35.txt, 36.txt, 37.txt, 38.txt, 39.txt, 40.txt, 41.txt, 42.txt, 43.txt, 44.txt, 45.txt, 46.txt, 47.txt, 48.txt, 49.txt, 50.txt, 51.txt, 52.txt, 53.txt, 54.txt, 55.txt, 56.txt, 57.txt, 58.txt, 59.txt, 60.txt, 61.txt, 62.txt, 63.txt, 64.txt, 65.txt, 66.txt, 67.txt, 68.txt, 69.txt, 70.txt, 71.txt, 72.txt, s1.txt, s2.txt
Case Name Status Exec Time Memory
01.txt WA 68 ms 7040 KB
02.txt AC 69 ms 7040 KB
03.txt WA 70 ms 7040 KB
04.txt WA 69 ms 7040 KB
05.txt WA 71 ms 7040 KB
06.txt WA 69 ms 7040 KB
07.txt AC 68 ms 7040 KB
08.txt AC 68 ms 7040 KB
09.txt AC 74 ms 7808 KB
10.txt AC 76 ms 9088 KB
11.txt AC 32 ms 5760 KB
12.txt AC 32 ms 5888 KB
13.txt AC 129 ms 11392 KB
14.txt AC 114 ms 10880 KB
15.txt AC 123 ms 10368 KB
16.txt AC 117 ms 8448 KB
17.txt AC 32 ms 6904 KB
18.txt AC 32 ms 6900 KB
19.txt AC 36 ms 7168 KB
20.txt AC 37 ms 7040 KB
21.txt AC 38 ms 7040 KB
22.txt AC 41 ms 7040 KB
23.txt AC 31 ms 6904 KB
24.txt AC 31 ms 6904 KB
25.txt AC 38 ms 7164 KB
26.txt AC 43 ms 7168 KB
27.txt AC 44 ms 7168 KB
28.txt AC 47 ms 7168 KB
29.txt AC 49 ms 7168 KB
30.txt AC 56 ms 7168 KB
31.txt WA 57 ms 7168 KB
32.txt WA 58 ms 7040 KB
33.txt AC 58 ms 7040 KB
34.txt WA 63 ms 7040 KB
35.txt AC 63 ms 7040 KB
36.txt WA 68 ms 7040 KB
37.txt WA 68 ms 7040 KB
38.txt WA 73 ms 6912 KB
39.txt WA 76 ms 6912 KB
40.txt WA 73 ms 7040 KB
41.txt WA 73 ms 7040 KB
42.txt WA 77 ms 8576 KB
43.txt WA 82 ms 6912 KB
44.txt WA 60 ms 7424 KB
45.txt WA 61 ms 7424 KB
46.txt WA 66 ms 7424 KB
47.txt WA 66 ms 7424 KB
48.txt WA 73 ms 7296 KB
49.txt WA 74 ms 7296 KB
50.txt WA 86 ms 7168 KB
51.txt WA 87 ms 7168 KB
52.txt WA 97 ms 7040 KB
53.txt WA 95 ms 7040 KB
54.txt WA 97 ms 7040 KB
55.txt WA 96 ms 7040 KB
56.txt AC 31 ms 6904 KB
57.txt WA 82 ms 10236 KB
58.txt WA 82 ms 10236 KB
59.txt AC 84 ms 7040 KB
60.txt AC 84 ms 7040 KB
61.txt WA 48 ms 8184 KB
62.txt WA 48 ms 8184 KB
63.txt AC 2 ms 2560 KB
64.txt AC 2 ms 2560 KB
65.txt AC 2 ms 2560 KB
66.txt AC 2 ms 2560 KB
67.txt AC 2 ms 2560 KB
68.txt AC 2 ms 2560 KB
69.txt AC 2 ms 2560 KB
70.txt AC 2 ms 2560 KB
71.txt AC 2 ms 2560 KB
72.txt AC 2 ms 2560 KB
s1.txt AC 2 ms 2560 KB
s2.txt AC 2 ms 2560 KB