結果
| 問題 |
No.1065 電柱 / Pole (Easy)
|
| ユーザー |
 yosupot
|
| 提出日時 | 2020-05-29 21:32:51 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 218 ms / 2,000 ms |
| コード長 | 5,958 bytes |
| コンパイル時間 | 1,299 ms |
| コンパイル使用メモリ | 126,592 KB |
| 最終ジャッジ日時 | 2025-01-10 16:35:35 |
|
ジャッジサーバーID （参考情報） |
judge1 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 46 |
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:238:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
238 | scanf("%d %d", &n, &m);
| ~~~~~^~~~~~~~~~~~~~~~~
main.cpp:240:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
240 | scanf("%d %d", &s, &t); s--; t--;
| ~~~~~^~~~~~~~~~~~~~~~~
main.cpp:243:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
243 | scanf("%lf %lf", &(x[i]), &(y[i]));
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
main.cpp:250:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
250 | scanf("%d %d", &a, &b); a--; b--;
| ~~~~~^~~~~~~~~~~~~~~~~
ソースコード
//#pragma GCC optimize("Ofast")
//#pragma GCC target("avx")
//#undef LOCAL
#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <complex>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>
using namespace std;
using uint = unsigned int;
using ll = long long;
using ull = unsigned long long;
constexpr ll TEN(int n) { return (n == 0) ? 1 : 10 * TEN(n - 1); }
template <class T> using V = vector<T>;
template <class T> using VV = V<V<T>>;
#include <unistd.h>
struct Scanner {
int fd = -1;
char line[(1 << 15) + 1];
size_t st = 0, ed = 0;
void reread() {
memmove(line, line + st, ed - st);
ed -= st;
st = 0;
ed += ::read(fd, line + ed, (1 << 15) - ed);
line[ed] = '\0';
}
bool succ() {
while (true) {
if (st == ed) {
reread();
if (st == ed) return false;
}
while (st != ed && isspace(line[st])) st++;
if (st != ed) break;
}
if (ed - st <= 50) {
bool sep = false;
for (size_t i = st; i < ed; i++) {
if (isspace(line[i])) {
sep = true;
break;
}
}
if (!sep) reread();
}
return true;
}
template <class T, enable_if_t<is_same<T, string>::value, int> = 0>
bool read_single(T& ref) {
if (!succ()) return false;
while (true) {
size_t sz = 0;
while (st + sz < ed && !isspace(line[st + sz])) sz++;
ref.append(line + st, sz);
st += sz;
if (!sz || st != ed) break;
reread();
}
return true;
}
template <class T, enable_if_t<is_integral<T>::value, int> = 0>
bool read_single(T& ref) {
if (!succ()) return false;
bool neg = false;
if (line[st] == '-') {
neg = true;
st++;
}
ref = T(0);
while (isdigit(line[st])) {
ref = 10 * ref + (line[st++] & 0xf);
}
if (neg) ref = -ref;
return true;
}
template <class T> bool read_single(V<T>& ref) {
for (auto& d : ref) {
if (!read_single(d)) return false;
}
return true;
}
void read() {}
template <class H, class... T> void read(H& h, T&... t) {
bool f = read_single(h);
assert(f);
read(t...);
}
Scanner(FILE* fp) : fd(fileno(fp)) {}
};
struct Printer {
public:
template <bool F = false> void write() {}
template <bool F = false, class H, class... T>
void write(const H& h, const T&... t) {
if (F) write_single(' ');
write_single(h);
write<true>(t...);
}
template <class... T> void writeln(const T&... t) {
write(t...);
write_single('\n');
}
Printer(FILE* _fp) : fp(_fp) {}
~Printer() { flush(); }
private:
static constexpr size_t SIZE = 1 << 15;
FILE* fp;
char line[SIZE], small[50];
size_t pos = 0;
void flush() {
fwrite(line, 1, pos, fp);
pos = 0;
}
void write_single(const char& val) {
if (pos == SIZE) flush();
line[pos++] = val;
}
template <class T, enable_if_t<is_integral<T>::value, int> = 0>
void write_single(T val) {
if (pos > (1 << 15) - 50) flush();
if (val == 0) {
write_single('0');
return;
}
if (val < 0) {
write_single('-');
val = -val; // todo min
}
size_t len = 0;
while (val) {
small[len++] = char(0x30 | (val % 10));
val /= 10;
}
for (size_t i = 0; i < len; i++) {
line[pos + i] = small[len - 1 - i];
}
pos += len;
}
void write_single(const string& s) {
for (char c : s) write_single(c);
}
void write_single(const char* s) {
size_t len = strlen(s);
for (size_t i = 0; i < len; i++) write_single(s[i]);
}
template <class T> void write_single(const V<T>& val) {
auto n = val.size();
for (size_t i = 0; i < n; i++) {
if (i) write_single(' ');
write_single(val[i]);
}
}
};
template <class D> struct MinDist {
V<D> dist;
V<int> from;
};
template <class D, class E>
MinDist<D> mindist(const VV<E>& g, int s, D inf = numeric_limits<D>::max()) {
int n = (int)g.size();
V<D> dist = V<D>(n, inf);
V<int> from = V<int>(n);
struct P {
D key;
int to;
bool operator<(P r) const { return key > r.key; }
};
priority_queue<P> q;
q.push(P{0, s});
dist[s] = D(0);
while (!q.empty()) {
P p = q.top();
q.pop();
if (dist[p.to] < p.key) continue;
for (E e : g[p.to]) {
if (p.key + e.dist < dist[e.to]) {
dist[e.to] = p.key + e.dist;
from[e.to] = p.to;
q.push(P{dist[e.to], e.to});
}
}
}
return MinDist<D>{dist, from};
}
Scanner sc = Scanner(stdin);
Printer pr = Printer(stdout);
struct E {
int to;
double dist;
};
int main() {
int n, m;
scanf("%d %d", &n, &m);
int s, t;
scanf("%d %d", &s, &t); s--; t--;
V<double> x(n), y(n);
for (int i = 0; i < n; i++) {
scanf("%lf %lf", &(x[i]), &(y[i]));
}
VV<E> g(n);
for (int i = 0; i < m; i++) {
int a, b;
scanf("%d %d", &a, &b); a--; b--;
double di = hypot(abs(x[a] - x[b]), abs(y[a] - y[b]));
g[a].push_back({b, di});
g[b].push_back({a, di});
}
auto dist = mindist<double>(g, s);
printf("%.20lf\n", dist.dist[t]);
return 0;
}