Submission #766262

#TimeUsernameProblemLanguageResultExecution timeMemory
766262birthdaycakeGrapevine (NOI22_grapevine)C++14
0 / 100
278 ms21088 KiB
#ifndef _GLIBCXX_NO_ASSERT #include <cassert> #endif #include <cctype> #include <cerrno> #include <cfloat> #include <ciso646> #include <climits> #include <clocale> #include <cmath> #include <csetjmp> #include <csignal> #include <cstdarg> #include <cstddef> #include <cstdio> #include <cstdlib> #include <cstring> #include <ctime> #if __cplusplus >= 201103L #include <ccomplex> #include <cfenv> #include <cinttypes> #include <cstdbool> #include <cstdint> #include <ctgmath> #include <cwchar> #include <cwctype> #endif #include <algorithm> #include <bitset> #include <complex> #include <deque> #include <exception> #include <fstream> #include <functional> #include <iomanip> #include <ios> #include <iosfwd> #include <iostream> #include <istream> #include <iterator> #include <limits> #include <list> #include <locale> #include <map> #include <memory> #include <new> #include <numeric> #include <ostream> #include <queue> #include <set> #include <sstream> #include <stack> #include <stdexcept> #include <streambuf> #include <string> #include <typeinfo> #include <utility> #include <valarray> #include <vector> #include <array> #include <atomic> #include <chrono> #include <condition_variable> #include <forward_list> #include <future> #include <initializer_list> #include <mutex> #include <random> #include <ratio> #include <regex> #include <scoped_allocator> #include <system_error> #include <thread> #include <tuple> #include <typeindex> #include <type_traits> #include <unordered_map> #include <unordered_set> #include <fstream> #define endl '\n' #define int long long #define mod 1000000007 using namespace std; vector<pair<int,int>>adj[200001]; int grape[200001], p[200001],seg[1000001][2],v[200001],l[200001],r[200001],lazy[1000001]; int cnt = 1,N,Left,Right,Val,T; void dfs(int x){ l[x] = cnt++; for(auto s: adj[x]){ if(s.first != p[x]){ p[s.first] = x; v[s.first] = v[x] + s.second; dfs(s.first); } } r[x] = cnt - 1; } void Spread(int ind){ if(lazy[ind] != 0){ seg[ind * 2][0] += lazy[ind]; seg[ind * 2 + 1][0] += lazy[ind]; lazy[ind * 2] += lazy[ind]; lazy[ind * 2 + 1]+= lazy[ind]; } lazy[ind] = 0; } void Update(int ll = 1, int rr = N, int ind = 1){ if(ll > Right or rr < Left) return; if(ll != rr) Spread(ind); if(ll >= Left and rr <= Right){ if(T == 0) seg[ind][1] = 0; else if(T == 1) seg[ind][1] = 1; else{ seg[ind][0] += Val; lazy[ind] += Val; } return; } int mid = (ll + rr) / 2; Update(ll, mid, ind * 2); Update(mid + 1, rr, ind * 2 + 1); int v1 = 1e18, v2 = 1e18; if(seg[ind * 2][1]) v1 = seg[ind * 2][0]; if(seg[ind * 2 + 1][1]) v2 = seg[ind * 2 + 1][0]; seg[ind][0] = min(v1,v2); if(seg[ind][0] != 1e18) seg[ind][1] = 1; } signed main(){ int n,q; cin >> n >> q; for(int i = 0; i < n - 1; i++){ int a,b,c; cin >> a >> b >> c; adj[a].push_back({b,c}); adj[b].push_back({a,c}); } dfs(1); N = exp2(ceil(log2(n))); for(int i = 1; i <= n; i++) seg[l[i] + N - 1][0] = v[i]; for(int i = 0; i < q; i++){ int t; cin >> t; if(t == 1){ int s; cin >> s; if(seg[1][0]){ cout << seg[1][0] << endl; }else{ cout << -1 << endl; } }else if(t == 2){ int vv; cin >> vv; grape[vv] = !grape[vv]; T = grape[vv]; Left = l[vv]; Right = r[vv]; Update(); }else{ int a,b,c; cin >> a >> b >> c; for(int j = 0; j < adj[a].size(); j++){ if(adj[a][j].first == b) Val = c - adj[a][j].second; } if(p[a] == b) {Left = l[a]; Right = r[a];} else {Left = l[b]; Right = r[b];} T = -1; Update(); for(int j = 0; j < adj[a].size(); j++){ if(adj[a][j].first == b) adj[a][j].second = c; } for(int j = 0; j < adj[b].size(); j++){ if(adj[b][j].first == a) adj[b][j].second = c; } } } }

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:163:30: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  163 |             for(int j = 0; j < adj[a].size(); j++){
      |                            ~~^~~~~~~~~~~~~~~
Main.cpp:170:30: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  170 |             for(int j = 0; j < adj[a].size(); j++){
      |                            ~~^~~~~~~~~~~~~~~
Main.cpp:173:30: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  173 |             for(int j = 0; j < adj[b].size(); j++){
      |                            ~~^~~~~~~~~~~~~~~
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