Submission #635310

#	Time	Username	Problem	Language	Result	Execution time	Memory
635310		ThMinh_	K blocks (IZhO14_blocks)	C++14	53 / 100	87 ms	196856 KiB

blocks

#include<bits/stdc++.h>
#define forin(i,a,b) for(int i=a;i<=b;++i)
#define forde(i,a,b) for(int i=a;i>=b;--i)
#define ll long long
using namespace std;
const int N = 5e3 + 10;
int n, k;
ll a[N], dp[N][N], sp[N][17];
void build() {
    forin(i,1,n) sp[i][0] = a[i];
    forin(j,1,log2(n)) forin(i,1,n - (1<<j) + 1) {
        sp[i][j] = max(sp[i][j - 1], sp[i + (1<<(j - 1))][j - 1]);
    }
}
ll cost(int f, int l) {
    if(f > l) return 1e16;
    int j = (int)log2(l - f + 1);
    return max(sp[f][j], sp[l - (1<<j) + 1][j]);
}
int main () {
    cin.tie(0)->sync_with_stdio(0);
    if(fopen("Task.inp","r")) {
        freopen("Task.inp","r",stdin);
        freopen("AC.out","w",stdout);
    }
    cin>>n>>k;
    forin(i,1,n) cin>>a[i];
    build();
    memset(dp, 127, sizeof(dp));
    dp[0][0] = 0;
    forin(o,1,k) forin(i,1,n) {
        ll &a = dp[i][o];
        forin(j,0,i - 1) {
            a = min(a, dp[j][o - 1] + cost(j + 1, i));
        }
    }
    cout<<dp[n][k];
}

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         freopen("Task.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
blocks.cpp:24:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |         freopen("AC.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 18 / 18
• Subtask 3: 21 / 21
• Subtask 4: 0 / 47