結果
| 問題 |
No.2731 Two Colors
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2024-04-23 18:02:37 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 203 ms / 3,000 ms |
| コード長 | 2,868 bytes |
| コンパイル時間 | 1,957 ms |
| コンパイル使用メモリ | 186,972 KB |
| 実行使用メモリ | 11,776 KB |
| 最終ジャッジ日時 | 2024-10-15 18:40:44 |
| 合計ジャッジ時間 | 5,599 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 33 |
コンパイルメッセージ
main.cpp: In function 'void solve()':
main.cpp:45:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
45 | auto [v, i, j] = pq0.top();
| ^
main.cpp:67:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
67 | auto [v, i, j] = pq1.top();
| ^
ソースコード
#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
#define drep(i, cc, n) for (ll i = (cc); i <= (n); ++i)
#define rep(i, n) drep(i, 0, n - 1)
#define all(a) (a).begin(), (a).end()
#define pb push_back
#define fi first
#define se second
mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());
const ll MOD1000000007 = 1000000007;
const ll MOD998244353 = 998244353;
const ll MOD[3] = {999727999, 1070777777, 1000000007};
const ll LINF = 1LL << 60LL;
const int IINF = (1 << 30) - 1;
void solve(){
int h, w; cin >> h >> w;
vector<vector<int>> a(h, vector<int>(w));
for(int i=0; i<h; i++) for(int j=0; j<w; j++) cin >> a[i][j];
priority_queue<tuple<int, int, int>, vector<tuple<int, int, int>>, greater<>> pq0, pq1;
int di[4] = {0, 0, 1, -1}, dj[4] = {1, -1, 0, 0};
vector<vector<int>> c(h, vector<int>(w, -1));
c[0][0] = 1;
c[h-1][w-1] = 0;
pq1.push({a[0][1], 0, 1});
pq1.push({a[1][0], 1, 0});
pq0.push({a[h-2][w-1], h-2, w-1});
pq0.push({a[h-1][w-2], h-1, w-2});
vector<vector<bool>> visited0(h, vector<bool>(w, false));
vector<vector<bool>> visited1(h, vector<bool>(w, false));
visited0[h-1][w-1] = visited0[h-2][w-1] = visited0[h-1][w-2] = true;
visited1[0][0] = visited1[1][0] = visited1[0][1] = true;
int ans = 0;
for(int turn=1; ; turn++){
ans++;
if(turn%2==0){
auto [v, i, j] = pq0.top();
pq0.pop();
c[i][j] = 0;
// check
for(int k=0; k<4; k++){
int nxt_i = i + di[k];
int nxt_j = j + dj[k];
if(nxt_i<0||nxt_j<0||h<=nxt_i||w<=nxt_j) continue;
if(c[nxt_i][nxt_j] == 1){
cout << ans << '\n';
return;
}
if(c[nxt_i][nxt_j]==-1 && !visited0[nxt_i][nxt_j]){
pq0.push({a[nxt_i][nxt_j], nxt_i, nxt_j});
visited0[nxt_i][nxt_j] = true;
}
}
}
if(turn%2==1){
auto [v, i, j] = pq1.top();
pq1.pop();
c[i][j] = 1;
// check
for(int k=0; k<4; k++){
int nxt_i = i + di[k];
int nxt_j = j + dj[k];
if(nxt_i<0||nxt_j<0||h<=nxt_i||w<=nxt_j) continue;
if(c[nxt_i][nxt_j] == 0){
cout << ans << '\n';
return;
}
if(c[nxt_i][nxt_j]==-1 && !visited1[nxt_i][nxt_j]){
pq1.push({a[nxt_i][nxt_j], nxt_i, nxt_j});
visited1[nxt_i][nxt_j] = true;
}
}
}
}
}
int main(){
cin.tie(nullptr);
ios::sync_with_stdio(false);
int T=1;
//cin >> T;
while(T--) solve();
}