Submission #117602

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
117602	2019-06-16T18:18:05 Z	KieranHorgan	Mecho (IOI09_mecho)	C++17	53 / 100	111 ms	11768 KB

mecho

#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization ("unroll-loops")
#include <bits/stdc++.h>

using namespace std;
#define endl '\n'
#define ll long long
// #define int short
#define ld double
#define pii pair<int,int>
#define rand() abs((rand()<<15)|rand())
#define randll() abs(((long long)rand()<<30)|rand())
const int MOD = 1000000007;

// char grid[805][805];
// int dist1[805][805];
// pair<int,int> dist3[805][805];
// int dist2[805][805];
// int dist[805][805];
// int vis[805][805];

signed main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	long long seed;
	asm("rdtsc" : "=A"(seed));
	srand(seed);

	int n, s;
	cin >> n >> s;
	int si, sj;
	int fi, fj;
	vector<pair<int,int>> p;
	vector<vector<char>> grid(n+2, vector<char>(n+2,0));
	for(int i = 1; i <= n; i++) {
		for(int j = 1; j <= n; j++) {
			cin >> grid[i][j];
			if(grid[i][j]=='M') {
				si = i;
				sj = j;
			}
			if(grid[i][j]=='D') {
				fi = i;
				fj = j;
			}
			if(grid[i][j]=='H') {
				p.push_back({i,j});
			}
			if(grid[i][j]=='T') grid[i][j]=0;
		}
	}

	vector<int> di = {1,0,-1,0};
	vector<int> dj = {0,1,0,-1};

	queue<pair<int,pair<int,int>>> q;

	vector<vector<int>> dist1(n+2, vector<int>(n+2,-1));
	dist1[si][sj]=0;
	q.push({0,{si,sj}});
	while(!q.empty()) {
		int d = q.front().first;
		int i = q.front().second.first;
		int j = q.front().second.second;
		q.pop();
		for(int x = 0; x < 4; x++) {
			if(grid[i+di[x]][j+dj[x]] == 0) continue;
			if(dist1[i+di[x]][j+dj[x]] != -1) continue;
			dist1[i+di[x]][j+dj[x]] = d+1;
			q.push({d+1,{i+di[x],j+dj[x]}});
		}
	}
	vector<vector<pair<int,int>>> dist3(n+2, vector<pair<int,int>>(n+2));
	for(int i = 1; i <= n; i++)
		for(int j = 1; j <= n; j++)
			if(dist1[i][j]>0) {
				dist3[i][j] = {(dist1[i][j]+s-1)/s,(dist1[i][j]+s-1)%s};
			}



	vector<vector<int>> dist2(n+2, vector<int>(n+2,-1));
	for(auto pp: p) {
		int pi = pp.first;
		int pj = pp.second;
		dist2[pi][pj]=0;
		q.push({0,{pi,pj}});
	}
	while(!q.empty()) {
		int d = q.front().first;
		int i = q.front().second.first;
		int j = q.front().second.second;
		q.pop();
		for(int x = 0; x < 4; x++) {
			if(grid[i+di[x]][j+dj[x]] == 0) continue;
			if(dist2[i+di[x]][j+dj[x]] != -1) continue;
			if(grid[i+di[x]][j+dj[x]] == 'D') continue;
			dist2[i+di[x]][j+dj[x]] = d+1;
			q.push({d+1,{i+di[x],j+dj[x]}});
		}
	}


	for(int i = 1; i <= n; i++)
		for(int j = 1; j <= n; j++)
			if(dist1[i][j]>=0) {
				dist2[i][j] = dist2[i][j]-dist3[i][j].first-(dist3[i][j].second==s-1);
			}

	// for(int i = 1; i <= n; i++) {
		// for(int j = 1; j <= n; j++) {
			// cerr << dist3[i][j].first << ":" << dist3[i][j].second << " ";
		// }
		// cerr << endl;
	// }
	// cerr << endl;
	// for(int i = 1; i <= n; i++) {
		// for(int j = 1; j <= n; j++) {
			// cerr << dist2[i][j] << " ";
		// }
		// cerr << endl;
	// }
	// cerr << endl;
	// for(int i = 1; i <= n; i++) {
		// for(int j = 1; j <= n; j++) {
			// cerr << dist2[i][j] << " ";
		// }
		// cerr << endl;
	// }
	// cerr << endl;

	vector<vector<bool>> vis(n+2, vector<bool>(n+2,0));
	priority_queue<pair<int,pair<int,int>>> pq;
	pq.push({dist2[si][sj], {si, sj}});
	int ans = dist2[si][sj];
	bool toBreak = 0;
	while(!pq.empty()) {
		int d = pq.top().first;
		int i = pq.top().second.first;
		int j = pq.top().second.second;
		pq.pop();
		ans = min(ans, d);
		if(i==fi && j == fj) break;
		for(int x = 0; x < 4; x++) {
			if(grid[i+di[x]][j+dj[x]] == 'D') {toBreak = 1; break;}
			if(grid[i+di[x]][j+dj[x]] == 0) continue;
			if(dist1[i+di[x]][j+dj[x]] <= 0) continue;
			if(vis[i+di[x]][j+dj[x]]) continue;
			vis[i+di[x]][j+dj[x]] = 1;
			pq.push({dist2[i+di[x]][j+dj[x]],{i+di[x],j+dj[x]}});
		}
		if(toBreak)break;
	}
	cout << ans << endl;
}

Compilation message

mecho.cpp:3:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization ("unroll-loops")
 
mecho.cpp: In function 'int main()':
mecho.cpp:144:17: warning: 'fj' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(i==fi && j == fj) break;
               ~~^~~~~
mecho.cpp:144:7: warning: 'fi' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(i==fi && j == fj) break;
      ~^~~~

Subtask #1

53.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	384 KB	Output is correct
2	Correct	2 ms	384 KB	Output is correct
3	Correct	2 ms	384 KB	Output is correct
4	Correct	2 ms	384 KB	Output is correct
5	Correct	2 ms	384 KB	Output is correct
6	Correct	2 ms	384 KB	Output is correct
7	Correct	100 ms	11256 KB	Output is correct
8	Correct	2 ms	512 KB	Output is correct
9	Correct	2 ms	384 KB	Output is correct
10	Correct	2 ms	384 KB	Output is correct
11	Correct	2 ms	384 KB	Output is correct
12	Correct	3 ms	384 KB	Output is correct
13	Incorrect	3 ms	384 KB	Output isn't correct
14	Incorrect	3 ms	384 KB	Output isn't correct
15	Correct	2 ms	384 KB	Output is correct
16	Correct	2 ms	384 KB	Output is correct
17	Correct	2 ms	384 KB	Output is correct
18	Correct	2 ms	384 KB	Output is correct
19	Correct	2 ms	384 KB	Output is correct
20	Correct	2 ms	384 KB	Output is correct
21	Correct	2 ms	384 KB	Output is correct
22	Correct	3 ms	384 KB	Output is correct
23	Correct	2 ms	384 KB	Output is correct
24	Correct	2 ms	384 KB	Output is correct
25	Correct	2 ms	384 KB	Output is correct
26	Correct	13 ms	384 KB	Output is correct
27	Correct	2 ms	512 KB	Output is correct
28	Correct	2 ms	384 KB	Output is correct
29	Correct	2 ms	384 KB	Output is correct
30	Correct	2 ms	384 KB	Output is correct
31	Correct	2 ms	512 KB	Output is correct
32	Correct	3 ms	384 KB	Output is correct
33	Correct	8 ms	2432 KB	Output is correct
34	Correct	8 ms	2560 KB	Output is correct
35	Incorrect	21 ms	2560 KB	Output isn't correct
36	Correct	10 ms	3200 KB	Output is correct
37	Correct	9 ms	3200 KB	Output is correct
38	Incorrect	25 ms	3200 KB	Output isn't correct
39	Correct	11 ms	3840 KB	Output is correct
40	Correct	11 ms	3840 KB	Output is correct
41	Incorrect	33 ms	3840 KB	Output isn't correct
42	Correct	15 ms	4608 KB	Output is correct
43	Correct	14 ms	4736 KB	Output is correct
44	Incorrect	40 ms	4608 KB	Output isn't correct
45	Correct	16 ms	5504 KB	Output is correct
46	Correct	15 ms	5504 KB	Output is correct
47	Incorrect	48 ms	5632 KB	Output isn't correct
48	Correct	19 ms	6528 KB	Output is correct
49	Correct	18 ms	6528 KB	Output is correct
50	Incorrect	60 ms	6528 KB	Output isn't correct
51	Correct	22 ms	7652 KB	Output is correct
52	Correct	21 ms	7680 KB	Output is correct
53	Incorrect	71 ms	7644 KB	Output isn't correct
54	Correct	25 ms	8676 KB	Output is correct
55	Correct	26 ms	8832 KB	Output is correct
56	Incorrect	81 ms	8824 KB	Output isn't correct
57	Correct	29 ms	10104 KB	Output is correct
58	Correct	27 ms	9976 KB	Output is correct
59	Incorrect	96 ms	9956 KB	Output isn't correct
60	Correct	32 ms	11256 KB	Output is correct
61	Correct	33 ms	11256 KB	Output is correct
62	Incorrect	111 ms	11356 KB	Output isn't correct
63	Correct	92 ms	11256 KB	Output is correct
64	Correct	91 ms	11308 KB	Output is correct
65	Correct	92 ms	11304 KB	Output is correct
66	Correct	92 ms	11384 KB	Output is correct
67	Incorrect	91 ms	11256 KB	Output isn't correct
68	Correct	77 ms	11256 KB	Output is correct
69	Correct	74 ms	11256 KB	Output is correct
70	Correct	74 ms	11256 KB	Output is correct
71	Correct	74 ms	11256 KB	Output is correct
72	Incorrect	69 ms	11256 KB	Output isn't correct
73	Incorrect	82 ms	11640 KB	Output isn't correct
74	Correct	77 ms	11640 KB	Output is correct
75	Correct	84 ms	11768 KB	Output is correct
76	Correct	78 ms	11640 KB	Output is correct
77	Correct	77 ms	11640 KB	Output is correct
78	Incorrect	95 ms	11680 KB	Output isn't correct
79	Correct	74 ms	11512 KB	Output is correct
80	Correct	83 ms	11512 KB	Output is correct
81	Correct	83 ms	11512 KB	Output is correct
82	Correct	75 ms	11640 KB	Output is correct
83	Correct	94 ms	11520 KB	Output is correct
84	Correct	86 ms	11512 KB	Output is correct
85	Correct	94 ms	11644 KB	Output is correct
86	Correct	92 ms	11492 KB	Output is correct
87	Correct	91 ms	11512 KB	Output is correct
88	Correct	102 ms	11476 KB	Output is correct
89	Correct	104 ms	11556 KB	Output is correct
90	Correct	98 ms	11384 KB	Output is correct
91	Correct	98 ms	11384 KB	Output is correct
92	Correct	99 ms	11384 KB	Output is correct