Submission #470123

#	Time	Username	Problem	Language	Result	Execution time	Memory
470123		Cross_Ratio	Boxes with souvenirs (IOI15_boxes)	C++14	0 / 100	1 ms	332 KiB

boxes

#include <bits/stdc++.h>
using namespace std;
#include "boxes.h"
const long long int INF = 1e18;
long long int A[50000006];
long long int B[50000006];
long long int cnt1 = 1, cnt2 = 1;
long long int C[50000006];
long long int D[50000006];
long long N, K, L;
long long delivery(int N1, int K1, int L1, int* P) {
    int i, j;
    N = N1;
    K = K1;
    L = L1;
    for(i=0;i<N;i++) {
        if(P[i] <= L/2) {
            A[cnt1++] = P[i];
        }
        else B[cnt2++] = L - P[i];
    }
    reverse(B + 1, B + cnt2);
    for(i=0;i<cnt1;i++) {
        if(!i) C[i] = 0;
        else if(i < K) C[i] = 2 * A[i];
        else C[i] = C[i-K] + 2*A[i];
    }
    for(i=0;i<cnt2;i++) {
        if(!i) D[i] = 0;
        else if(i < K) D[i] = 2 * B[i];
        else D[i] = D[i-K] + 2*B[i];
    }
    //for(i=0;i<cnt1;i++) cout << A[i] <<' ' << C[i] << '\n';
    //for(i=0;i<cnt2;i++) cout << B[i] << ' ' << D[i] << '\n';
    long long int ans = INF;
    int pt1 = cnt1 - 1;
    int pt2 = cnt2 - 1;
    for(int ct = 0; ct < cnt1 + cnt2; ct++) {
        long long int c = cnt1 - pt1 + cnt2 - pt2 - 2;
        long long ans2 = C[i] + D[j] + (c - 1 + K) / K * L;
        assert(ans2 >= 0);
        ans = min(ans, ans2);
        if(pt1 == 0 || A[pt1] - A[pt1-1] < B[pt2]-B[pt2-1]) pt2--;
        else pt1--;
    }
    /*for(i=0;i<cnt1;i++) {
        for(j=0;j<cnt2;j++) {
            long long int c = cnt1 - i + cnt2 - j - 2;
            long long ans2 = C[i] + D[j] + (c - 1 + K) / K * L;
            assert(ans2 >= 0);
            ans = min(ans, ans2);
        }
    }*/
    return ans;
}

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:36:20: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   36 |     int pt1 = cnt1 - 1;
      |               ~~~~~^~~
boxes.cpp:37:20: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   37 |     int pt2 = cnt2 - 1;
      |               ~~~~~^~~
boxes.cpp:40:36: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
   40 |         long long ans2 = C[i] + D[j] + (c - 1 + K) / K * L;
      |                                 ~~~^

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