제출 #1294924

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1294924		TIN	육각형 영역 (APIO21_hexagon)	C++20	컴파일 에러	0 ms	0 KiB

hexagon

#include <bits/stdc++.h>

using namespace std;

#define FNAME "test"

const int MOD = 1e9 + 7;

void Task() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	if (fopen(FNAME".inp","r")) {
		freopen(FNAME".inp","r",stdin);
		freopen(FNAME".out","w",stdout);
	}
}

const int dx[] = {+1,+1, 0,-1,-1, 0};
const int dy[] = { 0,-1,-1, 0,+1,+1};

long long computeArea(const vector<pair<long long, long long>>& points) {
	long long ret = 0;
	int n = (int) points.size();
	for (int i = 0; i < n; ++i) ret += points[i].first * points[(i + 1) % n].second;
	for (int i = 0; i < n; ++i) ret -= points[i].second * points[(i + 1) % n].first;
	ret /= 2;
	return abs(ret);
}

void Solve() {
	int N; cin >> N;
	vector<pair<long long, long long>> points; points.push_back({0, 0});
	long long B = 0;
	for (int i = 1; i <= N; ++i) {	
		int dir; cin >> dir; --dir;
		long long step; cin >> step;
		long long nx = points.back().first + step * dx[dir];
		long long ny = points.back().second + step * dy[dir];
		B += step;
		points.push_back({nx, ny});
	}
	long long S = computeArea(points);
	// I = S - B / 2 + 1
	long long ans = S - B / 2 + 1; ans %= MOD;
	ans = (ans + B) % MOD;
	cout << ans;
}

int main(void) {
	Task();
	Solve();
	return 2801^2801;
}

컴파일 시 표준 에러 (stderr) 메시지

hexagon.cpp: In function 'void Task()':
hexagon.cpp:13:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |                 freopen(FNAME".inp","r",stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
hexagon.cpp:14:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |                 freopen(FNAME".out","w",stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccs3rwxZ.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cctDIAD8.o:hexagon.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccs3rwxZ.o: in function `main':
grader.cpp:(.text.startup+0x220): undefined reference to `draw_territory(int, int, int, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status