Submission #554654

#	Time	Username	Problem	Language	Result	Execution time	Memory
554654		ac2hu	Nautilus (BOI19_nautilus)	C++14	0 / 100	1 ms	212 KiB

nautilus

#include <bits/stdc++.h>
#ifdef DEBUG
#include "../templates/debug.h"
#else 
#define deb(x...)
#endif
using namespace std;
// We can do this using bitsets but we need some way to keep track of the #s
/* Case 1: N, S, E, W we shift the bitset (and) it with current mask
 * Case 2: ? or all 4 shifted masks and then (and) it with current mask
 */
const int N = 9;
using B = bitset<N>;
int r,c;
vector<B> ocean, msk;
vector<B> north(){
    vector<B> temp(r);
    for(int i = 0;i<r - 1;i++){
        temp[i] = ocean[i + 1]; 
    }
    return temp;
}
vector<B> south(){
    vector<B> temp(r);
    for(int i = 0;i<r - 1;i++){
        temp[i + 1] = ocean[i]; 
    }
    return temp;
}
vector<B> west(){
    vector<B> temp = ocean;
    for(int i = 0;i<r;i++){
        temp[i] = temp[i] << 1;
    }
    return temp;
}
vector<B> east(){
    vector<B> temp = ocean;
    for(int i = 0;i<r;i++){
        temp[i] = temp[i] >> 1;
    }
    return temp;
}
void ord(vector<B> &o, vector<B> so){
    for(int i = 0;i<r;i++){
        o[i] |= so[i];
    }
}
signed main(){
	iostream::sync_with_stdio(false);cin.tie(nullptr);
    int m;cin >> r >> c >> m;
    ocean.resize(r);
    for(int i = 0;i<r;i++){
    	string t;cin >> t;
        for(int j = 0;j<c;j++){
            if(t[j] == '.'){
                ocean[i][j] = 1;
            }
        }
    }
    msk = ocean;
    string s;cin >> s;
    for(int i = 0;i<s.size();i++){
        vector<B> so;
        if(s[i] == '?'){
            so = north();
            ord(so, south());
            ord(so, west());
            ord(so, east());
        }
        else{
            if(s[i] == 'N'){
                so = north(); 
            }
            else if(s[i] == 'S'){
                so = south(); 
            }
            else if(s[i] == 'E'){
                so = west();
            }
            else{
                so = east();
            }
        }
        ocean = so;
        for(int j = 0;j<r;j++)
        	ocean[j] &= msk[j];
    }
    int cc = 0;
    for(int i = 0;i<r;i++){
        for(int j = 0;j<c;j++){
            if(ocean[i][j] == 1)
                cc++;
        }
    }
    cout << cc << "\n";
}

Compilation message (stderr)

nautilus.cpp: In function 'int main()':
nautilus.cpp:63:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |     for(int i = 0;i<s.size();i++){
      |                   ~^~~~~~~~~

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