제출 #710432

#제출 시각아이디문제언어결과실행 시간메모리
710432hafoMecho (IOI09_mecho)C++14
83 / 100
500 ms6452 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 = 1e9 + 69; int n, s, xd, yd, f[3][maxn][maxn]; char a[maxn][maxn]; pa d[] = {{-1, 0}, {1, 0}, {0, -1}, {0, 1}}; void bfs(int t, int time) { memset(f[t], -1, sizeof f[t]); queue<pa> q; for(int i = 0; i < n; i++) for(int j = 0; j < n; j++) { if(a[i][j] == 'M' && t != 0 && f[0][i][j] > time) { f[t][i][j] = 0; q.push({i, j}); } if(a[i][j] == 'H' && t == 0) { f[t][i][j] = 0; q.push({i, j}); } } while(!q.empty()) { int u = q.front().fi, v = q.front().se; q.pop(); 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' || f[t][x][y] != -1 || a[x][y] == 'H') continue; if(t && f[0][x][y] != -1 && f[0][x][y] - (f[1][u][v] + 1) / s < time) continue; f[t][x][y] = f[t][u][v] + 1; q.push({x, y}); } } } bool check(int time) { bfs(0, time); bfs(1, time); for(int k = 0; k < 4; k++) { int x = xd + d[k].fi; int y = yd + d[k].se; if(x < 0 || x == n || y < 0 || y == n || f[1][x][y] == -1) continue; if(f[1][x][y] == -1) return 1; if(f[0][x][y] - f[1][x][y] / s > time) return 1; } return 0; } 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] == 'D') { xd = i; yd = j; } } int l = 0, r = n * n, mid, res = -1; while(l <= r) { mid = l + r >> 1; if(check(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:87:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   87 |         mid = l + r >> 1;
      |               ~~^~~
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