제출 #41508

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
41508		fest	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	1075 ms	7404 KiB

skyscraper

// fest
#include <bits/stdc++.h>	

#define pb push_back
#define F first
#define S second
#define y1 dasdasfasfas
#define x1 wqdadfasfasfas
#define All(c) c.begin(), c.end()
#define SZ(A) (int((A).size()))
#define umap unordered_map
#define FILENAME ""
#define __ fflush(stdout)

typedef long long ll;
typedef long double ld;    

using namespace std;

void FREOPEN() {
	#ifdef COMP
		freopen(".in", "r", stdin);
		freopen("1.out", "w", stdout);
	#else
		freopen(FILENAME".in", "r", stdin);
		freopen(FILENAME".out", "w", stdout);
	#endif
}                           

inline double Time() {return (clock() * 1.0) / CLOCKS_PER_SEC; }             

const int N = 200500, inf = 1e9 * 2, MOD = (int)1e9 + 7;

char CH[N];

const ll INF = 1e18;

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

int dp[N];

vector<int> have[N];

int main() {
  
	int n, m;
	scanf("%d %d", &n, &m);
	int start = 0, finish = 0;
	for (int i = 0; i < m; i++) {
		int b, p;
		scanf("%d %d", &b, &p);
		have[b].pb(p);
		if (i == 0) start = b;
		if (i == 1) finish = b;
	}
	for (int i = 0; i < n; i++) sort(All(have[i]));
	for (int i = 0; i < n; i++) dp[i] = inf;
	dp[start] = 0;
	set<pair<int, int> > s;
	s.insert({0, start});
	while (!s.empty()) {
		int v = s.begin() -> S;
		s.erase(s.begin());
		for (auto p : have[v]) {
			for (int mul = 1; v + mul * p < n; mul++) {
				int u = v + mul * p;
				if (dp[u] > dp[v] + mul) {
					s.erase({dp[u], u});
					dp[u] = dp[v] + mul;
					s.insert({dp[u], u});
				}
				if (binary_search(All(have[u]), p)) break;
			}
			for (int mul = 1; v - mul * p >= 0; mul++) {
				int u = v - mul * p;
				if (dp[u] > dp[v] + mul) {
					s.erase({dp[u], u});
					dp[u] = dp[v] + mul;
					s.insert({dp[u], u});
				}
        if (binary_search(All(have[u]), p)) break;
			} 	
		}
	}
	if (dp[finish] == inf) dp[finish] = -1;
	cout << dp[finish];
	return 0;	
}

컴파일 시 표준 에러 (stderr) 메시지

skyscraper.cpp: In function 'void FREOPEN()':
skyscraper.cpp:25:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(FILENAME".in", "r", stdin);
                                     ^
skyscraper.cpp:26:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(FILENAME".out", "w", stdout);
                                       ^
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:48:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
                        ^
skyscraper.cpp:52:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &b, &p);
                         ^

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 14 / 14
• Subtask 4: 21 / 21
• Subtask 5: 0 / 43