oj.uz

Submission #447305

# Submission time Handle Problem Language Result Execution time Memory
447305 2021-07-26T03:05:23 Z LptN21 Kronican (COCI16_kronican) C++14
100 / 100
 1159 ms 4420 KB 
#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 pair<int, int> ii;
const int N = 20+1, M=20;
const int MOD = 998244353;
const int oo = 1e9;

int n, m, k, t;

const int MASK=(1<<M)-1;

int a[N][N], _dp[MASK+1];

int dp(int mask) {
    if(cntbit(mask)==m) return 0;
    if(_dp[mask]!=-1) return _dp[mask];
    int ans=oo;
    for(int i=0;i<n;i++) if(mask&(1<<i))
        for(int j=0;j<n;j++) if(i!=j&&mask&(1<<j))
            ans=min(ans, dp(mask^(1<<i))+a[i][j]);
    return _dp[mask]=ans;
}

signed main() {
    //freopen("test.inp", "r", stdin);
    //freopen("test.out", "w", stdout);
    //fastIO;
    scanf("%d%d", &n, &m);
    memset(_dp, -1, sizeof _dp);
    for(int i=0;i<n;i++) for(int j=0;j<n;j++)
            scanf("%d", &a[i][j]);
    printf("%d", dp((1<<n)-1));
    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

kronican.cpp: In function 'int main()':
kronican.cpp:40:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
kronican.cpp:43:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |             scanf("%d", &a[i][j]);
      |             ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4300 KB Output is correct
2 Correct 2 ms 4300 KB Output is correct
3 Correct 3 ms 4300 KB Output is correct
4 Correct 3 ms 4300 KB Output is correct
5 Correct 11 ms 4396 KB Output is correct
6 Correct 24 ms 4392 KB Output is correct
7 Correct 42 ms 4300 KB Output is correct
8 Correct 99 ms 4376 KB Output is correct
9 Correct 1159 ms 4420 KB Output is correct
10 Correct 98 ms 4372 KB Output is correct