Submission #216748

#	Time	Username	Problem	Language	Result	Execution time	Memory
216748		LittleFlowers__	Boxes with souvenirs (IOI15_boxes)	C++14	0 / 100	2092 ms	71296 KiB

boxes

#include <bits/stdc++.h>
using namespace std;
#define in ({int x=0;int c=getchar(),n=0;for(;!isdigit(c);c=getchar()) n=(c=='-');for(;isdigit(c);c=getchar()) x=x*10+c-'0';n?-x:x;})
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l,int r){return l+rng()%(r-l+1);}
#define fasty ios_base::sync_with_stdio(0),cin.tie(0);
#define forinc(a,b,c) for(int a=b,_c=c;a<=_c;++a)
#define fordec(a,b,c) for(int a=b,_c=c;a>=_c;--a)
#define forv(a,b) for(auto&a:b)
#define fi first
#define se second
#define pb push_back
#define ii pair<int,int>
#define mt make_tuple
#define all(a) a.begin(),a.end()
#define reset(f, x) memset(f, x, sizeof(f))
#define bit(x,i) ((x>>(i-1))&1)
#define on(x,i) (x|(1ll<<(i-1)))
#define off(x,i) (x&~(1<<(i-1)))
#define gg exit(0);

//#define unx 1

#ifndef unx
#include "boxes.h"
#endif // unx

const int N=3010;

int n,k,m;
int a[N],lf[N],rt[N];
long long f[N][N];
vector<int> val={0};

long long dfs(int l,int r){
    if(l-1<=r) return 0;
    long long &ret=f[l][r] ; if(ret>-1) return ret; ret=LLONG_MAX;
    long long sum;
    forinc(i,r+1,l-1){
        sum=lf[i]-lf[l];
        ret=min(ret,dfs(i,r) + (sum ? ((sum-1)/k+1)*(m-val[i])*2 : 0));
        sum=rt[i]-rt[r];
        ret=min(ret,dfs(l,i) + (sum ? ((sum-1)/k+1)*val[i]*2 : 0));
    }
    return ret;
}

long long delivery(int N,int K,int L,int p[]){ n=N, k=K, m=L;
    reset(f,-1);
    forinc(i,0,n-1) val.push_back(p[i]);
    sort(all(val)), val.erase(unique(all(val)),val.end());
    forinc(i,0,n-1) a[(int)(lower_bound(all(val),p[i])-val.begin())]++; a[0]=0;
    L=val.size();
    forinc(i,0,L-1) rt[i]=rt[i-1]+a[i];
    fordec(i,L-1,0) lf[i]=lf[i+1]+a[i];

    return dfs(L,0);
}

#ifdef unx
main(){
    #define task "boxes"
    freopen(task".inp","r",stdin);
    //freopen(task".out","w",stdout);

    int n,k,l; cin>>n>>k>>l;
    int p[1010];
    forinc(i,1,n) cin>>p[i-1];
    cout<<delivery(n,k,l,p)<<"\n";
}
#endif // unx

Compilation message (stderr)

boxes.cpp: In function 'int rnd(int, int)':
boxes.cpp:5:30: warning: conversion to 'int' from 'std::mersenne_twister_engine<long unsigned int, 32, 624, 397, 31, 2567483615, 11, 4294967295, 7, 2636928640, 15, 4022730752, 18, 1812433253>::result_type {aka long unsigned int}' may alter its value [-Wconversion]
 int rnd(int l,int r){return l+rng()%(r-l+1);}
                             ~^~~~~~~~~~~~~~
boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:48:45: warning: declaration of 'N' shadows a global declaration [-Wshadow]
 long long delivery(int N,int K,int L,int p[]){ n=N, k=K, m=L;
                                             ^
boxes.cpp:28:11: note: shadowed declaration is here
 const int N=3010;
           ^
boxes.cpp:7:23: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
 #define forinc(a,b,c) for(int a=b,_c=c;a<=_c;++a)
                       ^
boxes.cpp:52:5: note: in expansion of macro 'forinc'
     forinc(i,0,n-1) a[(int)(lower_bound(all(val),p[i])-val.begin())]++; a[0]=0;
     ^~~~~~
boxes.cpp:52:73: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
     forinc(i,0,n-1) a[(int)(lower_bound(all(val),p[i])-val.begin())]++; a[0]=0;
                                                                         ^
boxes.cpp:53:15: warning: conversion to 'int' from 'std::vector<int>::size_type {aka long unsigned int}' may alter its value [-Wconversion]
     L=val.size();
       ~~~~~~~~^~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30