結果
問題 | No.2319 Friends+ |
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"); } } }