Submission #1208447

#TimeUsernameProblemLanguageResultExecution timeMemory
1208447mychecksedadArranging Tickets (JOI17_arranging_tickets)C++20
0 / 100
2 ms4236 KiB
/* Author : Mychecksdead */ #include<bits/stdc++.h> using namespace std; #define ll long long int #define MOD (1000000000+7) #define MOD1 (998244353) #define pb push_back #define all(x) x.begin(), x.end() #define en cout << '\n' #define ff first #define ss second #define pii pair<int,int> #define vi vector<int> const int N = 1e6+100, M = 1e5+10, K = 52, MX = 30; struct Fenwick{ vector<int> t; Fenwick(int n){ t.resize(n + 1); } void add(int v, int x){ while(v < t.size()){ t[v]+=x; v += v & -v; } } int get(int v){ int res=0; while(v > 0){ res+=t[v]; v -= v&-v; } return res; } } fw(N); int n, m; array<int, 3> a[N]; void add(int l, int r, int x){ if(l < r){ for(int j = l; j < r; ++j) fw.add(j, x); }else{ for(int j = r; j <= n; ++j) fw.add(j, x); for(int j = 1; j < l; ++j) fw.add(j, x); } } int get(int l, int r){ int mx = 0; for(int j = l; j < r; ++j) mx=mx + fw.get(j) - fw.get(j-1); return mx; } void solve(){ cin >> n >> m; for(int i = 1; i <= m; ++i){ cin >> a[i][0] >> a[i][1] >> a[i][2]; if(a[i][1] < a[i][0]) swap(a[i][0], a[i][1]); add(a[i][0], a[i][1], 1); } sort(a+1, a+1+m, [&](const array<int, 3> &x, const array<int, 3> &y){ return get(x[0], x[1]) < get(y[0], y[1]); }); // for(int i = 1; i <= m; ++i){ // cerr << get(a[i][0], a[i][1]) << ' '; // // cerr << a[i][0] << ' ' << a[i][1] << '\n'; // } int ans = n; for(int k = 0; k <= m; ++k){ vector<int> cnt(n + 1); for(int i = 1; i <= m; ++i){ if(i <= k){ for(int j = a[i][0]; j < a[i][1]; ++j) cnt[j]++; }else{ for(int j = a[i][1]; j <= n; ++j) cnt[j]++; for(int j = 1; j < a[i][0]; ++j) cnt[j]++; } } ans = min(ans, *max_element(all(cnt))); } cout << ans; } int main(){ cin.tie(0); ios::sync_with_stdio(0); int tt = 1, aa; // freopen("in.txt", "r", stdin); // freopen("out.txt", "w", stdout); while(tt--){ solve(); en; } cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n"; return 0; }
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