QHROAD - Phá đường

Tác giả: RR

Ngôn ngữ: C++

#include <sstream>
#include <iomanip>
#include <iostream>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cmath>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <string>
#include <deque>
#include <complex>

#define FOR(i,a,b) for(int i=(a),_b=(b); i<=_b; i++)
#define FORD(i,a,b) for(int i=(a),_b=(b); i>=_b; i--)
#define REP(i,a) for(int i=0,_a=(a); i<_a; i++)
#define FORN(i,a,b) for(int i=(a),_b=(b);i<_b;i++)
#define DOWN(i,a,b) for(int i=a,_b=(b);i>=_b;i--)
#define SET(a,v) memset(a,v,sizeof(a))
#define sqr(x) ((x)*(x))
#define ll long long
#define F first
#define S second
#define PB push_back
#define MP make_pair

#define DEBUG(x) cout << #x << " = "; cout << x << endl;
#define PR(a,n) cout << #a << " = "; FOR(_,1,n) cout << a[_] << ' '; cout << endl;
#define PR0(a,n) cout << #a << " = "; REP(_,n) cout << a[_] << ' '; cout << endl;
using namespace std;

//Buffer reading
int INP,AM,REACHEOF;
#define BUFSIZE (1<<12)
char BUF[BUFSIZE+1], *inp=BUF;
#define GETCHAR(INP) { \
    if(!*inp) { \
        if (REACHEOF) return 0;\
        memset(BUF,0,sizeof BUF);\
        int inpzzz = fread(BUF,1,BUFSIZE,stdin);\
        if (inpzzz != BUFSIZE) REACHEOF = true;\
        inp=BUF; \
    } \
    INP=*inp++; \
}
#define DIG(a) (((a)>='0')&&((a)<='9'))
#define GN(j) { \
    AM=0;\
    GETCHAR(INP); while(!DIG(INP) && INP!='-') GETCHAR(INP);\
    if (INP=='-') {AM=1;GETCHAR(INP);} \
    j=INP-'0'; GETCHAR(INP); \
    while(DIG(INP)){j=10*j+(INP-'0');GETCHAR(INP);} \
    if (AM) j=-j;\
}
//End of buffer reading

const long double PI = acos((long double) -1.0);
const int MN = 100111;

int lab[MN], nReg, res[MN], eu[MN], ev[MN], query[MN], mark[MN];
int n, m, q;

int getRoot(int u) {
    if (lab[u] < 0) return u;
    return lab[u] = getRoot(lab[u]);
}

void merge(int u, int v) {
    u = getRoot(u); v = getRoot(v);
    if (u == v) return ;

    --nReg;

    int x = lab[u] + lab[v];
    if (lab[u] < lab[v]) {
        lab[u] = x;
        lab[v] = u;
    }
    else {
        lab[v] = x;
        lab[u] = v;
    }
}

void solve() {
    FOR(i,1,m) if (!mark[i]) {
        merge(eu[i], ev[i]);
    }

    FORD(i,q,1) {
        res[i] = nReg;
        int t = query[i];
        merge(eu[t], ev[t]);
    }

    FOR(i,1,q) printf("%d\n", res[i]);
}

int main() {
    while (scanf("%d%d%d", &n, &m, &q) == 3) {
        FOR(i,1,n) lab[i] = -1;
        nReg = n;

        FOR(i,1,m) {
            scanf("%d%d", &eu[i], &ev[i]);
        }

        memset(mark, 0, sizeof mark);

        FOR(i,1,q) {
            scanf("%d", &query[i]);
            mark[query[i]] = i;
        }

        solve();
    }
    return 0;
}

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