Submission #151710

#	Time	Username	Problem	Language	Result	Execution time	Memory
151710		Ruxandra985	Bali Sculptures (APIO15_sculpture)	C++14	50 / 100	93 ms	504 KiB

sculpture

/// upsi nu e aliens:))
/// ok aparent bv rux dar nu merge dinamica clasica daca ai or:))))
/// ar trebui sa mearga doar pe subtraskurile cu a = 1
#include <cstdio>
#include <iostream>
#define DIMN 2010
#define INF 4000000000000
using namespace std;
int v[DIMN],cnt[DIMN],n;
long long dp[DIMN],sp[DIMN];
int check (long long lambda , long long &sol){ /// sol = dp[n] , return = cnt[n]
    int i,poz,j;
    long long mini;
    for (i=1;i<=n;i++){
        mini = (dp[i-1] | v[i]) + lambda * (cnt[i-1] + 1);
        poz = i-1;
        for (j=i-2;j>=0;j--){
            if (mini > (dp[j] | (sp[i] - sp[j])) + lambda*(cnt[j] + 1)){
                mini = (dp[j] | (sp[i] - sp[j])) + lambda*(cnt[j] + 1);
                poz = j;
            }
        }
        dp[i] = (dp[poz] | (sp[i] - sp[poz]));
        cnt[i] = cnt[poz] + 1;
    }
    sol = dp[n] + lambda * cnt[n];
    return cnt[n];
}
int check2 (long long target){
    int i,j;
    /// daca ai 0 in target , nu poti sa pui tu 1

    for (i=1;i<=n;i++){
        cnt[i] = n + 1;
        for (j=i-1;j>=0;j--){
            if ((target | (sp[i] - sp[j])) <= target){ /// respecta
                cnt[i] = min (cnt[i] , cnt[j] + 1);
            }
        }
    }
    return cnt[n];
}
int main()
{
    FILE *fin = stdin;
    FILE *fout = stdout;
    int a,b,i,x;
    long long sol , solfinal,st,dr,mid,lastok;
    fscanf (fin,"%d%d%d",&n,&a,&b);
    for (i=1;i<=n;i++){
        fscanf (fin,"%d",&v[i]);
        sp[i] = sp[i-1] + v[i];
    }
    if (a!=1){
        solfinal =0;
        for (x=a;x<=b;x++){ /// aliens pe FIX x intervale
            st = -INF/2;
            dr = INF/2;
            while (st<=dr){
                mid = (st + dr)/2;
                sol = 0;
                if (check(mid,sol) > x)
                    st = mid + 1;
                else {
                    lastok = mid;
                    dr = mid - 1;
                }
            }
            sol = 0;
            check (lastok,sol);
            if (x == a)
                solfinal = sol - (long long)x * lastok;
            else solfinal = min (solfinal , sol - (long long)x * lastok);
        }
    }
    else { /// a = 1 , b e idk , deci poti sa selectezi CEL MULT b intervale
        solfinal = 0; /// prefix
        long long bit = ((long long)1<<40);
        for (;bit;bit/=2){
            if (check2(solfinal + bit-1) > b){ /// prefixul stabilit , bit e 0, restul 1
                solfinal = solfinal + bit; /// nu se poate sa ai 0 pe poz bit
            }
        }
    }
    fprintf (fout,"%lld",solfinal);
    return 0;
}

Compilation message (stderr)

sculpture.cpp: In function 'int main()':
sculpture.cpp:49:12: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     fscanf (fin,"%d%d%d",&n,&a,&b);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
sculpture.cpp:51:16: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         fscanf (fin,"%d",&v[i]);
         ~~~~~~~^~~~~~~~~~~~~~~~
sculpture.cpp:70:19: warning: 'lastok' may be used uninitialized in this function [-Wmaybe-uninitialized]
             check (lastok,sol);
             ~~~~~~^~~~~~~~~~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 16
• Subtask 3: 21 / 21
• Subtask 4: 0 / 25
• Subtask 5: 29 / 29