Submission #218693

#	Time	Username	Problem	Language	Result	Execution time	Memory
218693		alexandra_udristoiu	Boxes with souvenirs (IOI15_boxes)	C++14	100 / 100	500 ms	172536 KiB

boxes

#include<iostream>
#include "boxes.h"
using namespace std;
static long long d[10000005];
static int v[10000005];
long long delivery(int n, int k, int lg, int p[]) {
    int i, u;
    long long sol;
    for(i = 1; i <= n; i++){
        v[i] = p[i - 1];
    }
    for(i = 1; i <= n; i++){
        if(v[i] > lg - v[i]){
            u = i - 1;
            break;
        }
        if(i <= k){
            d[i] = 2 * v[i];
        }
        else{
            d[i] = 2 * v[i] + d[i - k];
        }
    }
    for(i = n; i > u; i--){
        if(i + k > n){
            d[i] = 2 * (lg - v[i]);
        }
        else{
            d[i] = 2 * (lg - v[i]) + d[i + k];
        }
    }
    sol = d[u] + d[u + 1];
    for(i = u; i >= 1 && i > u - k; i--){
        sol = min(sol, lg + d[i - 1] + d[ min(i + k, n + 1) ]);
    }
    return sol;
}

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:7:12: warning: 'u' may be used uninitialized in this function [-Wmaybe-uninitialized]
     int i, u;
            ^

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