結果

問題 No.20 砂漠のオアシス
ユーザー Ricky_ponRicky_pon
提出日時 2020-05-19 10:37:41
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 15 ms / 5,000 ms
コード長 2,298 bytes
コンパイル時間 2,900 ms
コンパイル使用メモリ 198,164 KB
最終ジャッジ日時 2025-01-10 13:02:51
ジャッジサーバーID
(参考情報)
judge1 / judge3
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
other AC * 21
権限があれば一括ダウンロードができます
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:38:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   38 |     scanf("%d%d%d%d", &n, &V, &ox, &oy);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
main.cpp:42:29: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   42 |     rep(i, n)rep(j, n) scanf("%d", &a[i][j]);
      |                        ~~~~~^~~~~~~~~~~~~~~~

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
#define For(i, a, b) for(int (i)=(int)(a); (i)<(int)(b); ++(i))
#define rFor(i, a, b) for(int (i)=(int)(a)-1; (i)>=(int)(b); --(i))
#define rep(i, n) For((i), 0, (n))
#define rrep(i, n) rFor((i), (n), 0)
#define fi first
#define se second
using namespace std;
typedef long long lint;
typedef unsigned long long ulint;
typedef pair<int, int> pii;
typedef pair<lint, lint> pll;
template<class T> bool chmax(T &a, const T &b){if(a<b){a=b; return true;} return false;}
template<class T> bool chmin(T &a, const T &b){if(a>b){a=b; return true;} return false;}
template<class T> T div_floor(T a, T b){
if(b < 0) a *= -1, b *= -1;
return a>=0 ? a/b : (a+1)/b-1;
}
template<class T> T div_ceil(T a, T b){
if(b < 0) a *= -1, b *= -1;
return a>0 ? (a-1)/b+1 : a/b;
}
constexpr lint mod = 1e9+7;
constexpr lint INF = mod * mod;
constexpr int MAX = 200010;
struct state{
int hp, x, y; bool used;
state(int h, int x, int y, bool u): hp(h), x(x), y(y), used(u){}
};
int dx[4] = {0, 1, 0, -1};
int dy[4] = {1, 0, -1, 0};
int main(){
int n, V, ox, oy;
scanf("%d%d%d%d", &n, &V, &ox, &oy);
--ox; --oy;
swap(ox, oy);
int a[n][n];
rep(i, n)rep(j, n) scanf("%d", &a[i][j]);
int d[n][n][2];
rep(i, n)rep(j, n)rep(k, 2) d[i][j][k] = -1;
auto cmp = [](const state &s1, const state &s2){return s1.hp < s2.hp;};
priority_queue<state, vector<state>, decltype(cmp)> que(cmp);
que.emplace(V, 0, 0, false);
d[0][0][0] = V;
while(!que.empty()){
auto s = que.top();
que.pop();
if(s.hp < d[s.x][s.y][s.used]) continue;
rep(i, 4){
int nx = s.x + dx[i], ny = s.y + dy[i];
if(0<=nx && nx<n && 0<=ny && ny<n){
if(nx == ox && ny == oy && !s.used){
if(s.hp > a[nx][ny] && chmax(d[nx][ny][1], (s.hp-a[nx][ny]) * 2)){
que.emplace(d[nx][ny][1], nx, ny, true);
}
}
else{
if(s.hp > a[nx][ny] && chmax(d[nx][ny][s.used], s.hp-a[nx][ny])){
que.emplace(d[nx][ny][s.used], nx, ny, s.used);
}
}
}
}
}
puts(d[n-1][n-1][0] > 0 || d[n-1][n-1][1] > 0 ? "YES" : "NO");
}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
0