結果
| 問題 |
No.2319 Friends+
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2023-05-28 19:47:59 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 2,635 ms / 3,000 ms |
| コード長 | 1,058 bytes |
| コンパイル時間 | 2,368 ms |
| コンパイル使用メモリ | 204,948 KB |
| 最終ジャッジ日時 | 2025-02-13 15:50:48 |
|
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 45 |
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:5:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
5 | scanf(" %d %d", &N, &M);
| ~~~~~^~~~~~~~~~~~~~~~~~
main.cpp:7:32: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
7 | for (auto& a : A) scanf(" %d", &a);
| ~~~~~^~~~~~~~~~~
main.cpp:11:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
11 | scanf(" %d %d", &a, &b);
| ~~~~~^~~~~~~~~~~~~~~~~~
main.cpp:30:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
30 | scanf(" %d", &Q);
| ~~~~~^~~~~~~~~~~
main.cpp:33:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
33 | scanf(" %d %d", &x, &y);
| ~~~~~^~~~~~~~~~~~~~~~~~
ソースコード
#include <bits/stdc++.h>
using namespace std;
int main () {
int N, M;
scanf(" %d %d", &N, &M);
std::vector<int> A(N);
for (auto& a : A) scanf(" %d", &a);
vector<vector<int>> gr(N);
for (int i = 0; i < M; i ++) {
int a, b;
scanf(" %d %d", &a, &b);
gr[--a].push_back(--b);
gr[b].push_back(a);
}
int s = max(1, (int)sqrt(M));
vector<vector<int>> bb(N);
vector<unordered_map<int, int>> X(N);
for (int i = 0; i < N; i ++) {
if (gr[i].size() > s) {
for (auto v : gr[i]) {
bb[v].push_back(i);
}
} else {
for (auto v : gr[i]) {
X[v][A[i]] ++;
}
}
}
int Q;
scanf(" %d", &Q);
while (Q--) {
int x, y;
scanf(" %d %d", &x, &y);
x --; y --;
if (A[x] == A[y]) {
puts("No");
continue;
}
int a = A[y];
bool ok = false;
if (X[x][a] > 0) {
ok = true;
} else {
for (auto v : bb[x]) {
ok = ok || (a == A[v]);
}
}
if (ok) {
puts("Yes");
if (gr[x].size() <= s) {
for (auto v : gr[x]) {
X[v][A[x]] --;
X[v][a] ++;
}
}
A[x] = a;
} else {
puts("No");
}
}
}