Submission #540859

#	Time	Username	Problem	Language	Result	Execution time	Memory
540859		Olympia	Nautilus (BOI19_nautilus)	C++17	0 / 100	151 ms	1260 KiB

nautilus

#include <cmath>
#include <iostream>
#include <set>
#include <climits>
#include <cstdio>
#include <algorithm>
#include <cassert>
#include <string>
#include <vector>
#include <iomanip>
#include <unordered_map>
#include <type_traits>
#include <string>
#include <queue>
#define ll long long
#include <map>

using namespace std;
vector<string> vec;
bool okay (int i, int j) {
    if (i < 0 || j < 0 || i >= vec.size() || j >= vec[0].size()) {
        return false;
    }
    if (vec[i][j] == '#') {
        return false;
    }
    return true;
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    set<pair<int,int>> pos;
    int R, C, M;
    cin >> R >> C >> M;
    vec.resize(R);
    for (int i = 0; i < R; i++) {
        cin >> vec[i];
        assert(vec[i].size() == C);
    }
    string s;
    cin >> s;
    for (int i = 0; i < R; i++) {
        for (int j = 0; j < C; j++) {
            if (vec[i][j] != '#') {
                pos.insert({i, j});
            }
        }
    }
    map<char,pair<int,int>> myMap;
    myMap['W'] = {0, -1};
    myMap['E'] = {-1, 0};
    myMap['N'] = {0, 1};
    myMap['S'] = {1, 0};
    for (int i = 0; i < s.length(); i++) {
        set<pair<int,int>> valid;
        for (char c: {'W', 'N', 'S', 'E'}) {
            if (s[i] == c || s[i] == '?') {
                for (auto& p: pos) {
                    if (p.first + myMap[c].first >= 0 && p.second + myMap[c].second >= 0
                    && p.first + myMap[c].first < R && p.second + myMap[c].second < C
                    && vec[p.first + myMap[c].first][p.second + myMap[c].second] == '.') {
                        valid.insert({p.first + myMap[c].first, p.second + myMap[c].second});
                    }
                }
            }
        }
        pos = valid;
        //for (auto& p: pos) {
            //cout << p.first << " " << p.second << '\n';
        //}
        //cout << '\n';
        //cout << '\n';
    }
    for (auto& p: pos) {
        //cout << p.first << " " << p.second << '\n';
    }
    cout << pos.size() << '\n';
}

Compilation message (stderr)

nautilus.cpp: In function 'bool okay(int, int)':
nautilus.cpp:21:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     if (i < 0 || j < 0 || i >= vec.size() || j >= vec[0].size()) {
      |                           ~~^~~~~~~~~~~~~
nautilus.cpp:21:48: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     if (i < 0 || j < 0 || i >= vec.size() || j >= vec[0].size()) {
      |                                              ~~^~~~~~~~~~~~~~~~
In file included from /usr/include/c++/10/cassert:44,
                 from nautilus.cpp:7:
nautilus.cpp: In function 'int main()':
nautilus.cpp:38:30: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   38 |         assert(vec[i].size() == C);
      |                ~~~~~~~~~~~~~~^~~~
nautilus.cpp:54:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |     for (int i = 0; i < s.length(); i++) {
      |                     ~~^~~~~~~~~~~~
nautilus.cpp:74:16: warning: unused variable 'p' [-Wunused-variable]
   74 |     for (auto& p: pos) {
      |                ^

• Subtask 1: 0 / 29
• Subtask 2: 0 / 37
• Subtask 3: 0 / 34