제출 #526441

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
526441		1ne	Regions (IOI09_regions)	C++14	13 / 100	665 ms	131076 KiB

regions

#include<bits/stdc++.h>
using namespace std;
 
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int64_t n,r,q;cin>>n>>r>>q;
vector<int64_t>region(n,-1),parent(n,-1);
cin>>region[0];
region[0]--;
vector<vector<int64_t>>adj(n);
for (int64_t i = 1;i<n;++i){
	cin>>parent[i]>>region[i];
	parent[i]--;
	adj[parent[i]].push_back(i);
	region[i]--;
}
vector<vector<pair<int64_t,int64_t>>>arr(r);
vector<bool>visited(n,false);
vector<int64_t>region_count(r,0);
function<void(int64_t)> dfs = [&](int64_t cur){
	if (visited[cur]){
		return;
	}
	visited[cur]=true;
	for (int j = 0;j<r;++j){
		if (j!=region[cur]&&region_count[j]>0)
			arr[j].push_back({region[cur],region_count[j]});
	}
	region_count[region[cur]]++;
	for (auto x:adj[cur]){
		if (!visited[x])
			dfs(x);
	}
	region_count[region[cur]]--;
};

for (int64_t i = 0;i<n;++i){
	if (!visited[i]){
		dfs(i);
	}
}
for (int64_t i = 0;i<r;++i){
	sort(arr[i].begin(),arr[i].end());
	for (int j = 1;j<arr[i].size();++j){
		arr[i][j].second+=arr[i][j-1].second;
	}
}
for (int64_t i = 0;i<q;++i){
	int64_t x,y;cin>>x>>y;
	--x;
	--y;
	if (arr[x].empty()){
		cout<<0<<endl;
		continue;
	}
	int64_t ans = -1;
	int64_t left = 0,right = arr[x].size()-1;
	while(left<=right){
		int64_t mid = (left + right)>>1;
		if (arr[x][mid].first<=y){
			left = mid + 1;
		}
		else{
			right = mid - 1;
		}
		if (arr[x][mid].first==y){
			ans = max(ans,mid);
		}
	}
	int64_t ans2 = INT_MAX;
	int64_t left2 = 0,right2 = arr[x].size()-1;
	while(left2<=right2){
		int64_t mid = (left2 + right2)>>1;
		if (arr[x][mid].first>=y){
			right2 = mid - 1;
		}
		else left2 = mid + 1;
		if (arr[x][mid].first==y){
			ans2 = min(ans2,mid);
		}
	}
	int64_t ans3 = 0;
	if (ans>=0){
		ans3+=arr[x][ans].second;
	}
	if (ans2>0&&ans2<INT_MAX){
		ans3-=arr[x][ans2-1].second;
	}
	cout<<max(ans3,(int64_t)0)<<endl;
	
}
return 0;}

컴파일 시 표준 에러 (stderr) 메시지

regions.cpp: In function 'int main()':
regions.cpp:45:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long int, long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |  for (int j = 1;j<arr[i].size();++j){
      |                 ~^~~~~~~~~~~~~~

• Subtask 1: 13 / 15
• Subtask 2: 0 / 85