제출 #1117292

#제출 시각아이디문제언어결과실행 시간메모리
1117292DON_FMecho (IOI09_mecho)C++14
4 / 100
140 ms6648 KiB
#include<bits/stdc++.h> using namespace std; using i64 = long long; #define all(x) x.begin(), x.end() #define L(i, b, e) for (int i = b; i < e; ++i) #define R(i, b, e) for (int i = b; i >= e; --i) #define pb emplace_back #define vi vector<int> #define sz(x) ((int) x.size()) const int N = 8e2 + 7, Mx = 1e9 + 9; const int dx[] = {1, -1, 0, 0}, dy[] = {0, 0, 1, -1}; int n, s; string a[N]; int dis1[N][N], dis2[N][N]; pair<int, int> st, d; bool in(int x, int y){ return (x >= 0 && y >= 0 && x < n && y < n && a[x][y] != 'T'); } int work(int m){ L(i, 0, n)L(j, 0, n)dis2[i][j] = Mx; queue<tuple<int, int, int>> q; q.push({st.first, st.second, s}); dis2[st.first][st.second] = m; while (!q.empty()){ auto [x, y, p] = q.front(); q.pop(); if (p == 0 && dis2[x][y] >= dis1[x][y])continue; if (p == 0)p = s; L(i, 0, 4){ int nx = x + dx[i], ny = y + dy[i]; if (in(nx, ny) && dis2[x][y] + (p == s) <= dis1[nx][ny] && dis2[nx][ny] == Mx && a[nx][ny] != 'H'){ q.push({nx, ny, p - 1}); dis2[nx][ny] = dis2[x][y] + (p == s); } } } return (dis2[d.first][d.second] != Mx); } int main(){ ios::sync_with_stdio(false); cin.tie(nullptr); cin >> n >> s; L(i, 0, n){ cin >> a[i]; } L(i, 0, n)L(j, 0, n)dis1[i][j] = dis2[i][j] = Mx; queue<pair<int, int>> q; L(i, 0, n){ L(j, 0, n){ if (a[i][j] == 'H'){ q.push({i, j}); dis1[i][j] = 0; }else if (a[i][j] == 'M'){ st = {i, j}; }else if (a[i][j] == 'D'){ d = {i, j}; } } } while (!q.empty()){ auto [x, y] = q.front(); q.pop(); L(i, 0, 4){ int nx = x + dx[i], ny = y + dy[i]; if (in(nx, ny) && a[nx][ny] != 'D' && dis1[nx][ny] == Mx){ q.push({nx, ny}); dis1[nx][ny] = dis1[x][y] + 1; } } } int lo = 0, hi = n * n, ans = -1; while (lo <= hi){ int mid = lo + (hi - lo) / 2; if (work(mid)){ ans = mid; lo = mid + 1; }else{ hi = mid - 1; } } cout << -1; }

컴파일 시 표준 에러 (stderr) 메시지

mecho.cpp: In function 'int work(int)':
mecho.cpp:25:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   25 |         auto [x, y, p] = q.front();
      |              ^
mecho.cpp: In function 'int main()':
mecho.cpp:62:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   62 |         auto [x, y] = q.front();
      |              ^
mecho.cpp:72:29: warning: variable 'ans' set but not used [-Wunused-but-set-variable]
   72 |     int lo = 0, hi = n * n, ans = -1;
      |                             ^~~
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