제출 #708870

#제출 시각아이디문제언어결과실행 시간메모리
708870hafoMecho (IOI09_mecho)C++17
19 / 100
548 ms9452 KiB
#include <bits/stdc++.h> #define ll long long #define ull unsigned ll #define pb push_back #define pa pair<int, int> #define pall pair<ll, int> #define fi first #define se second #define TASK "test" #define all(x) x.begin(), x.end() using namespace std; template<typename T1, typename T2> bool mini (T1 &a, T2 b) {if(a > b) a = b; else return 0; return 1;} template<typename T1, typename T2> bool maxi (T1 &a, T2 b) {if(a < b) a = b; else return 0; return 1;} const int MOD = 1e9 + 7; const int LOG = 20; const int maxn = 8e2 + 7; const ll oo = 1e17 + 69; int n, s, xm, ym, xd, yd, vis[maxn][maxn]; char a[maxn][maxn]; pa d[] = {{-1, 0}, {1, 0}, {0, -1}, {0, 1}}; bool bfs(int time) { memset(vis, 0, sizeof vis); deque<pa> q; for(int i = 0; i < n; i++) for(int j = 0; j < n; j++) if(a[i][j] == 'H') { q.pb({i, j}); vis[i][j] = 2; } q.push_front({xm, ym}); vis[xm][ym] = 1; int cnt = 0; bool ok = (time == 0); while(!q.empty()) { int u, v; vector<pa> cur; cnt++; if(cnt <= time && !ok) { while(vis[q.back().fi][q.back().se] == 2) { u = q.back().fi, v = q.back().se; q.pop_back(); cur.pb({u, v}); } } if(ok) { if(cnt <= s) { while(vis[q.front().fi][q.front().se] == 1) { u = q.front().fi, v = q.front().se; q.pop_front(); cur.pb({u, v}); } } else if(cnt == s + 1) { while(vis[q.back().fi][q.back().se] == 2) { u = q.back().fi, v = q.back().se; q.pop_back(); cur.pb({u, v}); } cnt = 0; } } vector<pa> nxt; bool type = 0; for(auto e:cur) { u = e.fi, v = e.se; for(int k = 0; k < 4; k++) { int x = u + d[k].fi; int y = v + d[k].se; if(x < 0 || x == n || y < 0 || y == n || a[x][y] == 'T' || vis[x][y]) continue; if(vis[u][v] == 1 && a[x][y] == 'H') continue; if(vis[u][v] == 2 && a[x][y] == 'D') continue; vis[x][y] = vis[u][v]; if(vis[x][y] == 1) type = 1; nxt.pb({x, y}); } } for(auto e:nxt) { if(type) q.push_front(e); else q.pb(e); } if(cnt == time && !ok) { ok = 1; cnt = 0; } } // for(int i = 0; i < n; i++) { // for(int j = 0; j < n; j++) cout<<vis[i][j]<<" "; // cout<<"\n"; // } return (vis[xd][yd] == 1); } int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); //freopen(TASK".inp", "r", stdin); //freopen(TASK".out", "w", stdout); cin>>n>>s; for(int i = 0; i < n; i++) for(int j = 0; j < n; j++) { cin>>a[i][j]; if(a[i][j] == 'M') { xm = i; ym = j; } if(a[i][j] == 'D') { xd = i; yd = j; } } int l = 0, r = n * n, mid, res = -1; while(l <= r) { mid = l + r >> 1; if(bfs(mid)) { l = mid + 1; res = mid; } else r = mid - 1; } cout<<res; return 0; }

컴파일 시 표준 에러 (stderr) 메시지

mecho.cpp: In function 'int main()':
mecho.cpp:119:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  119 |         mid = l + r >> 1;
      |               ~~^~~
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