oj.uz

Submission #79438

# Submission time Handle Problem Language Result Execution time Memory
79438 2018-10-13T20:09:21 Z duality Mousetrap (CEOI17_mousetrap) C++11
100 / 100
 1230 ms 169640 KB 
#define DEBUG 0

#include <bits/stdc++.h>
using namespace std;

#if DEBUG
// basic debugging macros
int __i__,__j__;
#define printLine(l) for(__i__=0;__i__<l;__i__++){cout<<"-";}cout<<endl
#define printLine2(l,c) for(__i__=0;__i__<l;__i__++){cout<<c;}cout<<endl
#define printVar(n) cout<<#n<<": "<<n<<endl
#define printArr(a,l) cout<<#a<<": ";for(__i__=0;__i__<l;__i__++){cout<<a[__i__]<<" ";}cout<<endl
#define print2dArr(a,r,c) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<a[__i__][__j__]<<" ";}cout<<endl;}
#define print2dArr2(a,r,c,l) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<setw(l)<<setfill(' ')<<a[__i__][__j__]<<" ";}cout<<endl;}

// advanced debugging class
// debug 1,2,'A',"test";
class _Debug {
    public:
        template<typename T>
        _Debug& operator,(T val) {
            cout << val << endl;
            return *this;
        }
};
#define debug _Debug(),
#else
#define printLine(l)
#define printLine2(l,c)
#define printVar(n)
#define printArr(a,l)
#define print2dArr(a,r,c)
#define print2dArr2(a,r,c,l)
#define debug
#endif

// define
#define MAX_VAL 999999999
#define MAX_VAL_2 999999999999999999LL
#define EPS 1e-6
#define mp make_pair
#define pb push_back

// typedef
typedef unsigned int UI;
typedef long long int LLI;
typedef unsigned long long int ULLI;
typedef unsigned short int US;
typedef pair<int,int> pii;
typedef pair<LLI,LLI> plli;
typedef vector<int> vi;
typedef vector<LLI> vlli;
typedef vector<pii> vpii;
typedef vector<plli> vplli;

// ---------- END OF TEMPLATE ----------

int t,m;
vi adjList[1000000];
int parent[1000000],dp[1000000];
int doDFS(int u,int p) {
    int i;
    int m1 = 0,m2 = 0,c = 0;
    parent[u] = p;
    for (i = 0; i < adjList[u].size(); i++) {
        int v = adjList[u][i];
        if (v != p) {
            doDFS(v,u);
            if (dp[v] >= m1) m2 = m1,m1 = dp[v];
            else if (dp[v] >= m2) m2 = dp[v];
            c++;
        }
    }
    dp[u] = m2+c;
    return dp[u];
}
vi w[1000000];
int sum[1000000];
int main() {
    int i;
    int n;
    int a,b;
    scanf("%d %d %d",&n,&t,&m),t--,m--;
    for (i = 1; i < n; i++) {
        scanf("%d %d",&a,&b);
        a--,b--;
        adjList[a].pb(b);
        adjList[b].pb(a);
    }

    int j;
    int u = m,p = -1,c = 0;
    doDFS(t,-1);
    while (u != t) {
        for (i = 0; i < adjList[u].size(); i++) {
            int v = adjList[u][i];
            if ((v != parent[u]) && (v != p)) w[c].pb(dp[v]),sum[c]++;
        }
        sort(w[c].begin(),w[c].end(),greater<int>());
        p = u,u = parent[u],c++;
    }
    for (i = c-1; i >= 0; i--) sum[i] += sum[i+1];
    int l = 0,r = n;
    while (l < r) {
        int m = (l+r) / 2;
        int used = 0,can = 0;
        for (i = 0; i < c; i++) {
            can++,p = used;
            for (j = 0; j < w[i].size(); j++) {
                if (w[i][j]+sum[i]+p > m) {
                    used++,can--;
                    if (can < 0) break;
                }
            }
            if (j < w[i].size()) break;
        }
        if ((i == c) && (used <= m)) r = m;
        else l = m+1;
    }
    printf("%d\n",l);

    return 0;
}

Compilation message

mousetrap.cpp: In function 'int doDFS(int, int)':
mousetrap.cpp:65:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (i = 0; i < adjList[u].size(); i++) {
                 ~~^~~~~~~~~~~~~~~~~~~
mousetrap.cpp: In function 'int main()':
mousetrap.cpp:95:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (i = 0; i < adjList[u].size(); i++) {
                     ~~^~~~~~~~~~~~~~~~~~~
mousetrap.cpp:109:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (j = 0; j < w[i].size(); j++) {
                         ~~^~~~~~~~~~~~~
mousetrap.cpp:115:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if (j < w[i].size()) break;
                 ~~^~~~~~~~~~~~~
mousetrap.cpp:83:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d",&n,&t,&m),t--,m--;
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
mousetrap.cpp:85:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d",&a,&b);
         ~~~~~^~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 45 ms 47352 KB Output is correct
2 Correct 44 ms 47448 KB Output is correct
3 Correct 47 ms 47448 KB Output is correct
4 Correct 42 ms 47448 KB Output is correct
5 Correct 51 ms 47476 KB Output is correct
6 Correct 45 ms 47476 KB Output is correct
7 Correct 45 ms 47540 KB Output is correct
8 Correct 45 ms 47568 KB Output is correct
9 Correct 54 ms 47568 KB Output is correct
10 Correct 42 ms 47696 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 545 ms 86908 KB Output is correct
2 Correct 418 ms 86908 KB Output is correct
3 Correct 994 ms 88328 KB Output is correct
4 Correct 477 ms 88328 KB Output is correct
5 Correct 990 ms 88328 KB Output is correct
6 Correct 1010 ms 88328 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 45 ms 47352 KB Output is correct
2 Correct 44 ms 47448 KB Output is correct
3 Correct 47 ms 47448 KB Output is correct
4 Correct 42 ms 47448 KB Output is correct
5 Correct 51 ms 47476 KB Output is correct
6 Correct 45 ms 47476 KB Output is correct
7 Correct 45 ms 47540 KB Output is correct
8 Correct 45 ms 47568 KB Output is correct
9 Correct 54 ms 47568 KB Output is correct
10 Correct 42 ms 47696 KB Output is correct
11 Correct 45 ms 88328 KB Output is correct
12 Correct 48 ms 88328 KB Output is correct
13 Correct 43 ms 88328 KB Output is correct
14 Correct 45 ms 88328 KB Output is correct
15 Correct 49 ms 88328 KB Output is correct
16 Correct 43 ms 88328 KB Output is correct
17 Correct 46 ms 88328 KB Output is correct
18 Correct 51 ms 88328 KB Output is correct
19 Correct 52 ms 88328 KB Output is correct
20 Correct 49 ms 88328 KB Output is correct
21 Correct 45 ms 88328 KB Output is correct
22 Correct 47 ms 88328 KB Output is correct

Subtask #4
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 45 ms 47352 KB Output is correct
2 Correct 44 ms 47448 KB Output is correct
3 Correct 47 ms 47448 KB Output is correct
4 Correct 42 ms 47448 KB Output is correct
5 Correct 51 ms 47476 KB Output is correct
6 Correct 45 ms 47476 KB Output is correct
7 Correct 45 ms 47540 KB Output is correct
8 Correct 45 ms 47568 KB Output is correct
9 Correct 54 ms 47568 KB Output is correct
10 Correct 42 ms 47696 KB Output is correct
11 Correct 545 ms 86908 KB Output is correct
12 Correct 418 ms 86908 KB Output is correct
13 Correct 994 ms 88328 KB Output is correct
14 Correct 477 ms 88328 KB Output is correct
15 Correct 990 ms 88328 KB Output is correct
16 Correct 1010 ms 88328 KB Output is correct
17 Correct 45 ms 88328 KB Output is correct
18 Correct 48 ms 88328 KB Output is correct
19 Correct 43 ms 88328 KB Output is correct
20 Correct 45 ms 88328 KB Output is correct
21 Correct 49 ms 88328 KB Output is correct
22 Correct 43 ms 88328 KB Output is correct
23 Correct 46 ms 88328 KB Output is correct
24 Correct 51 ms 88328 KB Output is correct
25 Correct 52 ms 88328 KB Output is correct
26 Correct 49 ms 88328 KB Output is correct
27 Correct 45 ms 88328 KB Output is correct
28 Correct 47 ms 88328 KB Output is correct
29 Correct 44 ms 88328 KB Output is correct
30 Correct 485 ms 88328 KB Output is correct
31 Correct 504 ms 88328 KB Output is correct
32 Correct 579 ms 169640 KB Output is correct
33 Correct 546 ms 169640 KB Output is correct
34 Correct 1069 ms 169640 KB Output is correct
35 Correct 1230 ms 169640 KB Output is correct
36 Correct 1068 ms 169640 KB Output is correct
37 Correct 1031 ms 169640 KB Output is correct
38 Correct 881 ms 169640 KB Output is correct
39 Correct 884 ms 169640 KB Output is correct
40 Correct 856 ms 169640 KB Output is correct