제출 #769855

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
769855		Ellinor	Tracks in the Snow (BOI13_tracks)	C++14	84.69 / 100	1967 ms	1048576 KiB

tracks

#include <bits/stdc++.h>
using namespace std;
    
#define rep(i,a,b) for(int i = (a); i < (b); i++)
typedef long long ll;
    
int H, W;
vector<string> grid;
    
vector<vector<ll>> visited; // bitset ?
    
//priority_queue<vector<ll>> q;
vector<vector<pair<ll, ll>>> pq_vec;
    
void dfs(int hat, int wat, ll num)
{
    //cerr << hat << " " << wat << " " <<num << "\n";
    if (visited[hat][wat]>0) return;
    if (grid[hat][wat] == '.') return;
    visited[hat][wat] = num;
    
    char ch = grid[hat][wat];
    if (hat + 1 < H) {
        if (grid[hat + 1][wat] == ch) pq_vec[num].push_back({hat + 1, wat});
        else pq_vec[num + 1].push_back({hat + 1, wat});
    }
    if (wat + 1 < W) {
        if (grid[hat][wat + 1] == ch) pq_vec[num].push_back({hat, wat + 1});
        else pq_vec[num + 1].push_back({hat, wat + 1});
    }
    if (hat - 1 >= 0) {
        if (grid[hat - 1][wat] == ch) pq_vec[num].push_back({hat - 1, wat});
        else pq_vec[num + 1].push_back({hat - 1, wat});
    }
    if (wat - 1 >= 0) {
        if (grid[hat][wat - 1] == ch) pq_vec[num].push_back({hat, wat - 1});
        else pq_vec[num + 1].push_back({hat, wat - 1});
    }
}
    
int32_t main()
{
    cin>>H>>W;
    grid.assign(H, "");
    rep(i,0,H){
        cin>>grid[i];
    }
    
    visited.assign(H, vector<ll>(W, -1));
    //q.push({-1,0,0});
    ll hw10 = H*W + 10;
    pq_vec.assign(hw10, {});
    pq_vec[1].push_back({0,0});

    // v

    ll i = 1;
    while(i < pq_vec.size())
    {
        ll j = 0;
        while (j < pq_vec[i].size())
        {
            pair<ll,ll> x = pq_vec[i][j];
            dfs(x.first, x.second, i);
            j++;
        }
        i++;
    }

    // ^
    
    ll ans = 1;
    rep(i,0,H){
        rep(j,0,W){
            ans = max(ans, visited[i][j]);
        }
    }
    cout << ans;
}

컴파일 시 표준 에러 (stderr) 메시지

tracks.cpp: In function 'int32_t main()':
tracks.cpp:58:13: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::vector<std::pair<long long int, long long int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |     while(i < pq_vec.size())
      |           ~~^~~~~~~~~~~~~~~
tracks.cpp:61:18: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |         while (j < pq_vec[i].size())
      |                ~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 54.6875 / 70