Submission #122242

#	Time	Username	Problem	Language	Result	Execution time	Memory
122242		duality	Mergers (JOI19_mergers)	C++11	0 / 100	110 ms	33320 KiB

mergers

#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 ----------

vi adjList[500000];
vi states[500000];
int parent[500000],depth[500000];
int doDFS(int u,int p,int d) {
    int i;
    parent[u] = p,depth[u] = d;
    for (i = 0; i < adjList[u].size(); i++) {
        int v = adjList[u][i];
        if (v != p) doDFS(v,u,d+1);
    }
    return 0;
}
int ds[500000];
int find(int n) {
    if (ds[n] != n) ds[n] = find(ds[n]);
    return ds[n];
}
int main() {
    int i;
    int N,K;
    int A,B,S;
    scanf("%d %d",&N,&K);
    for (i = 0; i < N-1; i++) {
        scanf("%d %d",&A,&B);
        A--,B--;
        adjList[A].pb(B);
        adjList[B].pb(A);
    }
    for (i = 0; i < N; i++) scanf("%d",&S),states[S-1].pb(i);

    int j;
    doDFS(0,-1,0);
    for (i = 0; i < N; i++) ds[i] = i;
    for (i = 0; i < K; i++) {
        for (j = 1; j < states[i].size(); j++) {
            int u = find(states[i][j-1]),v = find(states[i][j]);
            while (u != v) {
                if (depth[u] < depth[v]) swap(u,v);
                ds[u] = find(parent[u]),u = find(u);
            }
        }
    }
    int ans = 0;
    for (i = 0; i < N; i++) {
        if (ds[i] == i) {
            int deg = 0;
            for (j = 0; j < adjList[i].size(); j++) {
                int v = adjList[i][j];
                if (i != find(v)) deg++;
            }
            if (deg == 1) ans++;
        }
    }
    printf("%d\n",(ans+1)/2);

    return 0;
}

Compilation message (stderr)

mergers.cpp: In function 'int doDFS(int, int, int)':
mergers.cpp:64:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (i = 0; i < adjList[u].size(); i++) {
                 ~~^~~~~~~~~~~~~~~~~~~
mergers.cpp: In function 'int main()':
mergers.cpp:92:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (j = 1; j < states[i].size(); j++) {
                     ~~^~~~~~~~~~~~~~~~~~
mergers.cpp:104:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (j = 0; j < adjList[i].size(); j++) {
                         ~~^~~~~~~~~~~~~~~~~~~
mergers.cpp:79:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&N,&K);
     ~~~~~^~~~~~~~~~~~~~~
mergers.cpp:81:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d",&A,&B);
         ~~~~~^~~~~~~~~~~~~~~
mergers.cpp:86:43: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for (i = 0; i < N; i++) scanf("%d",&S),states[S-1].pb(i);
                             ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 24
• Subtask 3: 0 / 14
• Subtask 4: 0 / 22
• Subtask 5: 0 / 30