Submission #422045

#	Time	Username	Problem	Language	Result	Execution time	Memory
422045		LptN21	Selotejp (COCI20_selotejp)	C++14	110 / 110	54 ms	40360 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define fastIO ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
#define FF first
#define SS second
#define pb push_back
#define sz(x) (int)x.size()
#define PI acos(-1.0)
#define lb lower_bound
#define ub upper_bound
#define all(a) (a).begin(), (a).end()
#define odd(x) __builtin_parity((int)x)
#define cntbit(x) __builtin_popcount(x)
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> ii;
typedef pair<ll, ii> i3;
const int N = 1000+7, M=10;
const ll MOD = 1e9+7;
const int oo = 1e9;

int MASK;

int n, m, k, t, d;

int a[N], _dp[N][M][1024];

bool check(int i, int j) {return i&(1<<j);}

signed main() {
    //freopen("test.inp", "r", stdin);
    //freopen("test.out", "w", stdout);
    scanf("%d%d", &n, &m); t=oo;
    char ch[m]; MASK=(1<<m);
    for(int i=1;i<=n;i++) {
        scanf("%s", &ch); a[i] = 0;
        for(int j=0;j<m;j++) a[i]=2*a[i]+(ch[j]=='#');
    }
    for(int k=1;k<=n;k++) for(int j=0;j<m;j++) for(int i=0;i<MASK;i++) {
        if(i&(1<<j)) {
            if(!check(a[k], j)) _dp[k][j][i]=oo;
            else if(!j) _dp[k][j][i]=min((k==1?oo:_dp[k-1][m-1][i]), _dp[k-1][m-1][i^(1<<j)]+1);
            else _dp[k][j][i]=min(_dp[k][j-1][i]+(k==1), _dp[k][j-1][i^(1<<j)]+1);
        } else {
            if(!j) _dp[k][j][i]=min(_dp[k-1][m-1][i], _dp[k-1][m-1][i^(1<<j)])+check(a[k], j);
            else {
                if(!check(a[k], j)||(check(a[k], j-1)&&!check(i, j-1)))
                    _dp[k][j][i]=min(_dp[k][j-1][i], _dp[k][j-1][i^(1<<j)]);
                else _dp[k][j][i]=min(_dp[k][j-1][i], _dp[k][j-1][i^(1<<j)])+1;
            }
        }
    }
    for(int i=0;i<MASK;i++) t=min(t, _dp[n][m-1][i]);
    printf("%d", t);
    return 0;
}
/* stuff you should look for
    - int overflow, array bounds
    - special cases (n=1?)
    - do smth instead of do nothing and stay organized
    - WRITE STUFF DOWN
    - DONT JUST STICK ON ONE APPROACH
*/

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:36:17: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[m]' [-Wformat=]
   36 |         scanf("%s", &ch); a[i] = 0;
      |                ~^   ~~~
      |                 |   |
      |                 |   char (*)[m]
      |                 char*
Main.cpp:33:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     scanf("%d%d", &n, &m); t=oo;
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp:36:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |         scanf("%s", &ch); a[i] = 0;
      |         ~~~~~^~~~~~~~~~~

• Subtask 1: 35 / 35
• Subtask 2: 35 / 35
• Subtask 3: 40 / 40