제출 #82248

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
82248		tjdgus4384	공룡 발자국 (KOI18_footprint)	C++14	0 / 100	4 ms	508 KiB

footprint

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

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

int main()
{
    int n, j, m = 1000000000;
    scanf("%d", &n);
    for(int i = 0;i < n;i++)
    {
        scanf("%d %d", &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("%d %d\n", x[j], y[j]);
    for(int i = 0;i < v.size();i++)
    {
        printf("%d %d\n", v[i].first + x[j], v[i].second + y[j]);
    }
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

footprint.cpp: In function 'int main()':
footprint.cpp:30:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0;i < v.size();i++)
                   ~~^~~~~~~~~~
footprint.cpp:16:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
footprint.cpp:19:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &x[i], &y[i]);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
footprint.cpp:29:11: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
     printf("%d %d\n", x[j], y[j]);
     ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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