Submission #679458

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
679458	2023-01-08 10:02:05	qwerasdfzxcl	Collapse (JOI18_collapse)	C++17	100 / 100	3218 ms	26612 KiB

collapse

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#include "collapse.h"
#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
constexpr int B = 1001;
struct DSU{
    int path[100100], sz[100100], cnt;
    vector<pair<int, int>> mylog;
    void init(int n){for (int i=1;i<=n;i++){path[i] = i; sz[i] = 1;} mylog.clear(); cnt = 0;}
    int find(int s){
        if (s==path[s]) return s;
        return find(path[s]);
    }
    bool merge(int x, int y){
        //printf("merge: %d %d\n", x, y);
        x = find(x), y = find(y);
        if (x==y) return 0;
        cnt++;
        if (sz[x] > sz[y]) swap(x, y);
        path[x] = y;
        sz[y] += sz[x];
        mylog.emplace_back(x, sz[x]);
        return 1;
    }
    void rollback(int c){
        while(c--){
            auto [x, _sz] = mylog.back(); mylog.pop_back();
            sz[path[x]] -= _sz;
 
 
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Compilation message (stderr)

collapse.cpp: In function 'void calc(int, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
collapse.cpp:72:13: warning: variable 'op' set but not used [-Wunused-but-set-variable]
   72 |         int op, x, y;
      |             ^~

• Subtask 1: 5 / 5
• Subtask 2: 30 / 30
• Subtask 3: 30 / 30
• Subtask 4: 35 / 35