oj.uz

답안 #61524

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
61524 2018-07-26T06:54:28 Z 강태규(#1777) Min-max tree (BOI18_minmaxtree) C++11
100 / 100
 308 ms 20760 KB 
#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <unordered_map>
#include <functional>
#include <cstring>
#include <cmath>
#include <ctime>
#include <cstdlib>

using namespace std;
typedef long long llong;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<llong, llong> pll;

int n;
const int inf = 1e9 + 7;

struct query {
    int x, y, z;
    char scan() {
        static char in[10];
        scanf("%s%d%d%d", in, &x, &y, &z);
        return *in;
    }
};

vector<int> edge[70001];
vector<query> qs[256];
int par[70001][17];
int nxt[70001];
int dep[70001];

void dfs(int x, int p) {
    par[x][0] = p;
    dep[x] = dep[p] + 1;
    for (int i = 1; i < 17; ++i) {
        par[x][i] = par[par[x][i - 1]][i - 1];
    }
    for (int i : edge[x]) {
        if (i == p) continue;
        dfs(i, x);
    }
}

int lca(int x, int y) {
    if (dep[x] < dep[y]) swap(x, y);
    for (int i = 17; i--; ) {
        if ((dep[x] - dep[y]) >> i) x = par[x][i];
    }
    if (x == y) return x;
    for (int i = 17; i--; ) {
        if (par[x][i] != par[y][i]) {
            x = par[x][i];
            y = par[y][i];
        }
    }
    return par[x][0];
}

int mn[70001];
int mx[70001];

int paint(int c[], int s, int e, int x) {
    if (dep[s] <= dep[e]) return s;
    if (c[s]) return nxt[s] = paint(c, nxt[s], e, x);
    c[s] = x;
    return nxt[s] = paint(c, par[s][0], e, x);
}

int find(vector<int> &v, int x) {
    return lower_bound(v.begin(), v.end(), x) - v.begin();
}

struct matching {
    vector<int> edge[70001];
    int rev[70001];
    int visited[70001];
    int lv[70001];
    int n;
    
    void bfs() {
        queue<int> q;
        for (int i = 2; i <= n; ++i) {
            if (visited[i]) lv[i] = inf;
            else lv[i] = 0, q.push(i);
        }
        
        while (!q.empty()) {
            int x = q.front();
            q.pop();
            for (int i : edge[x]) {
                if (rev[i]) {
                    if (lv[rev[i]] < inf) continue;
                    lv[rev[i]] = lv[x] + 1;
                    q.push(rev[i]);
                }
            }
        }
    }
    
    int dfs(int x) {
        for (int i : edge[x]) {
            if (rev[i] == 0 || lv[rev[i]] == lv[x] + 1 && dfs(rev[i])) {
                visited[x] = 1;
                rev[i] = x;
                return 1;
            }
        }
        return 0;
    }
    
    int process(int N) {
        n = N;
        int ret = 0;
        while (1) {
            bfs();
            int res = 0;
            for (int i = 2; i <= n; ++i) {
                if (visited[i]) continue;
                res += dfs(i);
            }
            if (res == 0) break;
            ret += res;
        }
        return ret;
    }
} mt;

int main() {
    scanf("%d", &n);
    for (int i = 1; i < n; ++i) {
        int a, b;
        scanf("%d%d", &a, &b);
        edge[a].push_back(b);
        edge[b].push_back(a);
    }
    dfs(1, 0);
    int k;
    scanf("%d", &k);
    vector<int> cp;
    for (int i = 0; i < k; ++i) {
        query q;
        char c = q.scan();
        qs[c].push_back(q);
        cp.push_back(q.z);
    }
    cp.push_back(0);
    sort(cp.begin(), cp.end());
    cp.erase(unique(cp.begin(), cp.end()), cp.end());
    
    sort(qs['m'].begin(), qs['m'].end(), [&](const query &x, const query &y) {
        return x.z > y.z;
    });
    sort(qs['M'].begin(), qs['M'].end(), [&](const query &x, const query &y) {
        return x.z < y.z;
    });
    
    for (query i : qs['m']) {
        int p = lca(i.x, i.y);
        paint(mn, i.x, p, i.z);
        paint(mn, i.y, p, i.z);
    }
    
    for (query i : qs['M']) {
        int p = lca(i.x, i.y);
        paint(mx, i.x, p, i.z);
        paint(mx, i.y, p, i.z);
    }
    
    for (int i = 2; i <= n; ++i) {
        if (mn[i]) mt.edge[i].push_back(find(cp, mn[i]));
        if (mn[i] == mx[i]) continue;
        if (mx[i]) mt.edge[i].push_back(find(cp, mx[i]));
    }
    
    mt.process(n);
    
    for (int i = 1; i < cp.size(); ++i) {
        mn[mt.rev[i]] = cp[i];
    }
    
    for (int i = 2; i <= n; ++i) {
        printf("%d %d %d\n", i, par[i][0], mn[i]);
    }
    
	return 0;
}

Compilation message

minmaxtree.cpp: In member function 'int matching::dfs(int)':
minmaxtree.cpp:109:56: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
             if (rev[i] == 0 || lv[rev[i]] == lv[x] + 1 && dfs(rev[i])) {
                                ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
minmaxtree.cpp: In function 'int main()':
minmaxtree.cpp:150:13: warning: array subscript has type 'char' [-Wchar-subscripts]
         qs[c].push_back(q);
             ^
minmaxtree.cpp:184:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 1; i < cp.size(); ++i) {
                     ~~^~~~~~~~~~~
minmaxtree.cpp:136:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
minmaxtree.cpp:139:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &a, &b);
         ~~~~~^~~~~~~~~~~~~~~~
minmaxtree.cpp:145:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &k);
     ~~~~~^~~~~~~~~~
minmaxtree.cpp: In member function 'char query::scan()':
minmaxtree.cpp:28:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%s%d%d%d", in, &x, &y, &z);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 3576 KB Output is correct
2 Correct 6 ms 3812 KB Output is correct
3 Correct 6 ms 3812 KB Output is correct
4 Correct 6 ms 3812 KB Output is correct

Subtask #2
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 210 ms 19464 KB Output is correct
2 Correct 232 ms 19464 KB Output is correct
3 Correct 203 ms 19464 KB Output is correct
4 Correct 219 ms 20060 KB Output is correct
5 Correct 203 ms 20060 KB Output is correct
6 Correct 187 ms 20060 KB Output is correct
7 Correct 240 ms 20060 KB Output is correct

Subtask #3
29.0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 144 ms 20060 KB Output is correct
2 Correct 164 ms 20060 KB Output is correct
3 Correct 178 ms 20060 KB Output is correct
4 Correct 204 ms 20060 KB Output is correct
5 Correct 198 ms 20060 KB Output is correct
6 Correct 218 ms 20060 KB Output is correct
7 Correct 209 ms 20060 KB Output is correct
8 Correct 175 ms 20060 KB Output is correct

Subtask #4
42.0 / 42.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 3576 KB Output is correct
2 Correct 6 ms 3812 KB Output is correct
3 Correct 6 ms 3812 KB Output is correct
4 Correct 6 ms 3812 KB Output is correct
5 Correct 210 ms 19464 KB Output is correct
6 Correct 232 ms 19464 KB Output is correct
7 Correct 203 ms 19464 KB Output is correct
8 Correct 219 ms 20060 KB Output is correct
9 Correct 203 ms 20060 KB Output is correct
10 Correct 187 ms 20060 KB Output is correct
11 Correct 240 ms 20060 KB Output is correct
12 Correct 144 ms 20060 KB Output is correct
13 Correct 164 ms 20060 KB Output is correct
14 Correct 178 ms 20060 KB Output is correct
15 Correct 204 ms 20060 KB Output is correct
16 Correct 198 ms 20060 KB Output is correct
17 Correct 218 ms 20060 KB Output is correct
18 Correct 209 ms 20060 KB Output is correct
19 Correct 175 ms 20060 KB Output is correct
20 Correct 231 ms 20060 KB Output is correct
21 Correct 278 ms 20060 KB Output is correct
22 Correct 268 ms 20060 KB Output is correct
23 Correct 238 ms 20060 KB Output is correct
24 Correct 248 ms 20060 KB Output is correct
25 Correct 287 ms 20760 KB Output is correct
26 Correct 308 ms 20760 KB Output is correct
27 Correct 274 ms 20760 KB Output is correct
28 Correct 279 ms 20760 KB Output is correct
29 Correct 260 ms 20760 KB Output is correct
30 Correct 304 ms 20760 KB Output is correct
31 Correct 278 ms 20760 KB Output is correct
32 Correct 296 ms 20760 KB Output is correct
33 Correct 197 ms 20760 KB Output is correct
34 Correct 203 ms 20760 KB Output is correct
35 Correct 194 ms 20760 KB Output is correct