제출 #977510

#제출 시각아이디문제언어결과실행 시간메모리
977510faricaMecho (IOI09_mecho)C++14
16 / 100
179 ms24084 KiB
#include <bits/stdc++.h> #define int long long using namespace std; const int MAX_N = 4e5 + 5; bool visited[800][800]; void solve() { int n, s, sx, sy; cin >> n >> s; vector<vector<int>>dist(n, vector<int>(n, -1)); string grid[n]; queue<pair<int,int>>q; for(int i=0; i<n; ++i) { cin >> grid[i]; for(int j=0; j<n; ++j) { if(grid[i][j] == 'H') { q.push({i, j}); dist[i][j] = 0; } else if(grid[i][j] == 'M') sx=i, sy=j; } } while(!q.empty()) { int i = q.front().first, j = q.front().second; q.pop(); if(i && dist[i-1][j] == -1 && grid[i-1][j] != 'T') { dist[i-1][j] = dist[i][j] + 1; q.push({i-1, j}); } if(j && dist[i][j-1] == -1 && grid[i][j-1] != 'T') { dist[i][j-1] = dist[i][j] + 1; q.push({i, j-1}); } if(i<n-1 && dist[i+1][j] == -1 && grid[i+1][j] != 'T') { dist[i+1][j] = dist[i][j] + 1; q.push({i+1, j}); } if(j<n-1 && dist[i][j+1] == -1 && grid[i][j+1] != 'T') { dist[i][j+1] = dist[i][j] + 1; q.push({i, j+1}); } } priority_queue<pair<pair<int,int>, pair<int,int>>>pq; pq.push({{dist[sx][sy], 0}, {sx, sy}}); while(!pq.empty()) { int val = pq.top().first.first, x = pq.top().second.first, y = pq.top().second.second, eD = pq.top().first.second; pq.pop(); if(visited[x][y] or val<0) continue; int cost = eD/s + (eD % s > 0 ? 1 : 0); if(grid[x][y] == 'D') { cout << val << endl; return; } else visited[x][y] = 1; if(x && grid[x-1][y] != 'T') pq.push({{min(val, dist[x-1][y] - cost), eD + 1}, {x-1, y}}); if(y && grid[x][y-1] != 'T') pq.push({{min(val, dist[x][y-1] - cost), eD + 1}, {x, y-1}}); if(x+1<n && grid[x+1][y] != 'T') pq.push({{min(val, dist[x+1][y] - cost), eD + 1}, {x+1, y}}); if(y+1<n && grid[x][y+1] != 'T') pq.push({{min(val, dist[x][y+1] - cost), eD + 1}, {x, y+1}}); } cout << -1 << endl; } signed main() { ios::sync_with_stdio(false); cin.tie(0); cout.tie(0); int t = 1; while(t--) solve(); return 0; }

컴파일 시 표준 에러 (stderr) 메시지

mecho.cpp: In function 'void solve()':
mecho.cpp:46:26: warning: 'sy' may be used uninitialized in this function [-Wmaybe-uninitialized]
   46 |     pq.push({{dist[sx][sy], 0}, {sx, sy}});
      |                          ^
mecho.cpp:46:22: warning: 'sx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   46 |     pq.push({{dist[sx][sy], 0}, {sx, sy}});
      |                      ^
#Verdict Execution timeMemoryGrader output
Fetching results...