Submission #82981

#	Time	Username	Problem	Language	Result	Execution time	Memory
82981		rezolden	K blocks (IZhO14_blocks)	C++14	0 / 100	6 ms	784 KiB

blocks

#include <bits/stdc++.h>

#define maxn 100010
#define maxk 110
#define FOR(i,a,b) for(int i=a;i<=b;++i)
#define FORD(i,a,b) for(int i=a;i>=b;--i)

typedef long long ll;
using namespace std;
const char *fi="BLOCKS.INP";
const char *fo="BLOCKS.OUT";

int n,k,A[maxn],P[maxn];
ll F[maxn][maxk];

int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	freopen(fi,"r",stdin);
//	freopen(fo,"w",stdout);
    cin>>n>>k;
    FOR(i,1,n) cin>>A[i];
    P[0]=0;
    FOR(i,1,n) P[i]=max(P[i-1],A[i]);

    FOR(i,1,n) F[i][1]=P[i];
    FOR(j,2,k){
        int maxright=0; ll sumleft=F[j-1][j-1];
        FOR(i,j,n){
            maxright = max(maxright,A[i]);
//            cout<<i<<' '<<j<<' '<<sumleft<<' '<<maxright<<' '<<(F[i-1][j-1]+P[i-1]+A[i])<<endl;
            if (sumleft+maxright < F[i-1][j-1]+A[i]) F[i][j]=sumleft+maxright;
            else {
                sumleft = F[i-1][j-1];
                maxright = A[i];
                F[i][j]=F[i-1][j-1]+A[i];
            }
        }
    }

    cout<<F[n][k];
	return 0;
}

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:18:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  freopen(fi,"r",stdin);
  ~~~~~~~^~~~~~~~~~~~~~

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