제출 #302811

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
302811		BlancaHM	Regions (IOI09_regions)	C++14	14 / 100	8090 ms	21612 KiB

regions

#include <iostream>
#include <fstream>
#include <cfloat>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <queue>
#include <stack>
#include <cstring>
#include <cmath>
#include <climits>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
using namespace std;
typedef pair<int, int> pii;
typedef long long int ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<vvi> vvvi;
typedef vector<vvvi> vvvvi;
typedef vector<pii> vpii;
typedef vector<vpii> vvpii;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<vvl> vvvl;
typedef vector<vvvl> vvvvl;
typedef vector<string> vs;
#define fir first
#define sec second
#define pb push_back
#define eb emplace_back
#define ppb pop_back
#define pf push_front
#define ppf pop_front
#define mp make_pair
#define len(v) ((int)v.size())
#define all(v) v.begin(), v.end()

vi country;
vvi G;
int N, R, e1, e2, ans;

int dfs(int S) {
	int cur = 0;
	for (auto v: G[S]) {
		cur += dfs(v);
		if (country[v] == e2) cur++;
	}
	if (country[S] == e1) ans += cur;
	return cur;
}

int main() {
	int Q, cn, sup;
	scanf("%d %d %d", &N, &R, &Q);
	G.assign(N, vi());
	country = vi(N);
	cin >> cn;
	country[0] = cn;
	map<pii, int> past;
	for (int i = 1; i < N; i++) {
		scanf("%d %d", &sup, &cn);
		G[sup-1].push_back(i);
		country[i] = cn;
	}
	while(Q--) {
		scanf("%d %d", &e1, &e2);
		if (past.find(mp(e1, e2)) != past.end()) {
			printf("%d\n", past[mp(e1, e2)]);
			fflush(stdout);
			continue;
		}
		ans = 0;
		dfs(0);
		printf("%d\n", ans);
		fflush(stdout);
		past[mp(e1, e2)] = ans;
	}
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

regions.cpp: In function 'int main()':
regions.cpp:57:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   57 |  scanf("%d %d %d", &N, &R, &Q);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:64:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   64 |   scanf("%d %d", &sup, &cn);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~
regions.cpp:69:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   69 |   scanf("%d %d", &e1, &e2);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 15
• Subtask 2: 0 / 85