Submission #581490

#	Time	Username	Problem	Language	Result	Execution time	Memory
581490		Saeed_247	Mecho (IOI09_mecho)	C++14	47 / 100	255 ms	12372 KiB

mecho

#include <bits/stdc++.h>
using namespace std;
template<typename T> void dout(string name, T arg) {
    cerr << name << " = " << arg << "\e[39m" << endl;
}
template<typename T1, typename... T2> void dout(string names, T1 arg, T2... args) {
    cerr << names.substr(0, names.find(',')) << " = " << arg << " | ";
    dout(names.substr(names.find(',') + 2), args...);
}
#define debug(...) cerr << "\e[91m" << "[" << __LINE__ << ":" << __func__ << "]=> ", dout(#__VA_ARGS__,  __VA_ARGS__);

const pair<int, int> dir[] = {{0, 1}, {0, -1}, {1, 0}, {-1, 0}};
const int N = 800;
bool visited[N][N];
long long n, s;
vector<vector<char>> arr;
vector<pair<long long, long long>> hives;
pair<long long, long long> m, d;
queue<pair<long long, long long>> q;

bool move(int x, int y) {
    return x >= 0 && y >= 0 && x < n && y < n;
}

bool check(long long tim, vector<vector<long long>>& dist, vector<vector<long long>>& swarm) {
    memset(visited, false, sizeof visited);
    while (q.size()) q.pop();
    q.push(m);
    visited[m.first][m.second] = true;
    while (!q.empty()) {
        auto [x, y] = q.front();
        if (q.front() == d) return true;
        q.pop();
        for (auto [xx, yy] : dir) if (move(x + xx, y + yy) && (arr[x + xx][y + yy] == 'G' || 
            arr[x + xx][y + yy] == 'D') && !visited[x + xx][y + yy] && (dist[x + xx][y + yy] + tim < swarm[x + xx][y + yy] || 
                (dist[x + xx][y + yy] + tim == swarm[x + xx][y + yy] && dist[d.first][d.second] == dist[x + xx][y + yy]))) {
                q.push({x + xx, y + yy});
                visited[x + xx][y + yy] = true;
        }
    }
    return false;
}

int main() {
    ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    cin >> n >> s;
    arr.resize(n, vector<char> (n));
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            cin >> arr[i][j];
            if (arr[i][j] == 'M') {
                m = {i, j};
            }
            if (arr[i][j] == 'H') {
                hives.push_back({i, j});
            }
            if (arr[i][j] == 'D') {
                d = {i, j};
            }
        }
    }

    vector<vector<long long>> dist(n, vector<long long>(n, 1e18)), swarm(n, vector<long long>(n, 1e18));
    dist[m.first][m.second] = 0;
    q.push(m);
    while (!q.empty()) {
        auto [x, y] = q.front();
        q.pop();
        for (auto [xx, yy] : dir) if (move(x + xx, y + yy) && (arr[x + xx][y + yy] == 'G' || 
            arr[x + xx][y + yy] == 'D') && dist[x + xx][y + yy] > dist[x][y] + 1) {
                dist[x + xx][y + yy] = dist[x][y] + 1;
                q.push({x + xx, y + yy});
        }
    }
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            dist[i][j] = dist[i][j] / s + (dist[i][j] % s != 0);
        }
    }
    for (auto [x, y] : hives) {
        swarm[x][y] = 0;
        q.push({x, y});
    }
    while (!q.empty()) {
        auto [x, y] = q.front();
        q.pop();
        for (auto [xx, yy] : dir) if (move(x + xx, y + yy) && arr[x + xx][y + yy] == 'G' && swarm[x + xx][y + yy] > swarm[x][y] + 1) {
                swarm[x + xx][y + yy] = swarm[x][y] + 1;
                q.push({x + xx, y + yy});
        }
    }

    long long l = 0, h = 1e9;
    while (h - l > 1) {
        long long mid = (h + l) / 2;
        if (check(mid, dist, swarm)) l = mid;
        else h = mid;
    }
    cout << l << '\n';
    return 0;
}

Compilation message (stderr)

mecho.cpp: In function 'bool check(long long int, std::vector<std::vector<long long int> >&, std::vector<std::vector<long long int> >&)':
mecho.cpp:31:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   31 |         auto [x, y] = q.front();
      |              ^
mecho.cpp:34:19: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   34 |         for (auto [xx, yy] : dir) if (move(x + xx, y + yy) && (arr[x + xx][y + yy] == 'G' ||
      |                   ^
mecho.cpp: In function 'int main()':
mecho.cpp:67:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   67 |         auto [x, y] = q.front();
      |              ^
mecho.cpp:69:19: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   69 |         for (auto [xx, yy] : dir) if (move(x + xx, y + yy) && (arr[x + xx][y + yy] == 'G' ||
      |                   ^
mecho.cpp:80:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   80 |     for (auto [x, y] : hives) {
      |               ^
mecho.cpp:85:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   85 |         auto [x, y] = q.front();
      |              ^
mecho.cpp:87:19: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   87 |         for (auto [xx, yy] : dir) if (move(x + xx, y + yy) && arr[x + xx][y + yy] == 'G' && swarm[x + xx][y + yy] > swarm[x][y] + 1) {
      |                   ^

• Subtask 1: 47 / 100