Submission #82250

#	Time	Username	Problem	Language	Result	Execution time	Memory
82250		tjdgus4384	공룡 발자국 (KOI18_footprint)	C++14	14 / 100	5 ms	1460 KiB

footprint

#include<cstdio>
#include<vector>
#include<algorithm>
using namespace std;
typedef long long ll;
vector<pair<ll, ll> > v;
ll x[3000], y[3000];

bool cmp(pair<ll, ll> a, pair<ll, ll> b)
{
    return a.first * b.second - a.second * b.first > 0;
}

int main()
{
    int n, j;
    ll m = 1000000000;
    scanf("%d", &n);
    for(int i = 0;i < n;i++)
    {
        scanf("%lld %lld", &x[i], &y[i]);
        if(y[i] < m) {m = y[i];j = i;}
    }
    for(int i = 0;i < n;i++)
    {
        if(i == j) continue;
        v.push_back({x[i] - x[j], y[i] - y[j]});
    }
    sort(v.begin(), v.end(), cmp);
    printf("%d\n", n);
    printf("%lld %lld\n", x[j], y[j]);
    for(int i = 0;i < v.size();i++)
    {
        printf("%lld %lld\n", v[i].first + x[j], v[i].second + y[j]);
    }
    return 0;
}

Compilation message (stderr)

footprint.cpp: In function 'int main()':
footprint.cpp:32:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0;i < v.size();i++)
                   ~~^~~~~~~~~~
footprint.cpp:18:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
footprint.cpp:21:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld %lld", &x[i], &y[i]);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
footprint.cpp:31:11: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
     printf("%lld %lld\n", x[j], y[j]);
     ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 0 / 12
• Subtask 3: 0 / 29
• Subtask 4: 0 / 45