Submission #807355

#	Time	Username	Problem	Language	Result	Execution time	Memory
807355		YassirSalama	Boxes with souvenirs (IOI15_boxes)	C++17	20 / 100	1 ms	212 KiB

boxes

#include "boxes.h"
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define OVL(v,s) for(auto x:v) cout<<x<<s;cout<<endl;
#define all(v) v.begin(),v.end()
#define F first
#define S second
#define pb push_back
void dbg_out() { cout << endl; }
template<typename Head, typename... Tail> void dbg_out(Head H, Tail... T) { cout << ' ' << H; dbg_out(T...); }
#define dbg(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__);
#define endl "\n"
#define mod 1000000007
const ll INF=1e18;
long long delivery(int N, int K, int L, int p[]) {
    vector<int> v;
    v.push_back(0);
    for(int i=0;i<N;i++) v.pb(p[i]);
    sort(all(v));
    v.push_back(0);
    auto diff = [&](int a,int b){
        //a is smaller than b
        return min(b-a,L-b+a);
    };
    if(K==1){
        // dbg;
        ll ans=0;
        // OVL(v," ")
        for(auto x:v) ans+=2*diff(0,x);
        // dbg(ans);
        return ans; 
    }
    else{
        ll ans=0;
        for(int i=0;i+1<v.size();i++){
            ans+=diff(min(v[i],v[i+1]),max(v[i],v[i+1]));
        }
          return ans;

    }
    //{0,1,4,6,7,0}
    //diff between going from i to i+1 in the same direction, or 
    
}
#ifdef IOI

static char _buffer[1024];
static int _currentChar = 0;
static int _charsNumber = 0;
static FILE *_inputFile, *_outputFile;

static inline int _read() {
    if (_charsNumber < 0) {
        exit(1);
    }
    if (!_charsNumber || _currentChar == _charsNumber) {
        _charsNumber = (int)fread(_buffer, sizeof(_buffer[0]), sizeof(_buffer), _inputFile);
        _currentChar = 0;
    }
    if (_charsNumber <= 0) {
        return -1;
    }
    return _buffer[_currentChar++];
}

static inline int _readInt() {
    int c, x, s;
    c = _read();
    while (c <= 32) c = _read();
    x = 0;
    s = 1;
    if (c == '-') {
        s = -1;
        c = _read();
    }
    while (c > 32) {
        x *= 10;
        x += c - '0';
        c = _read();
    }
    if (s < 0) x = -x;
    return x;
}

int main() {
    _inputFile = fopen("boxes.in", "rb");
    _outputFile = fopen("boxes.out", "w");

    int N, K, L, i;
    N = _readInt();
    K = _readInt();
    L = _readInt();

    int *p = (int*)malloc(sizeof(int) * (unsigned int)N);

    for (i = 0; i < N; i++) {
        p[i] = _readInt();
    }
    fprintf(_outputFile, "%lld\n", delivery(N, K, L, p));
    return 0;
}
#endif

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:36:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |         for(int i=0;i+1<v.size();i++){
      |                     ~~~^~~~~~~~~

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