Submission #41506

#	Time	Username	Problem	Language	Result	Execution time	Memory
41506		fest	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	22 / 100	30 ms	30188 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("2.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 = 3001, 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};

bool was[N][N];

int dp[N][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++) for (int j = 0; j < N; j++) dp[i][j] = inf;
	vector<pair<int, int> > vers;
	for (auto i : have[start]) dp[start][i] = 0, was[start][i] = 1, vers.pb({start, i});
	int l = 0;
	while (l < SZ(vers)) {
		int v = vers[l].F;
		int p = vers[l].S;
		l++;
		if (v + p < n) {
			if (!was[v + p][p]) {
				was[v + p][p] = 1;
				dp[v + p][p] = dp[v][p] + 1;
				vers.pb({v + p, p});
				if (!have[v + p].empty()) {
					if (!was[v + p][have[v + p][0]]) {
						for (auto i : have[v + p]) {
					  	was[v + p][i] = 1;
					  	dp[v + p][i] = dp[v][p] + 1;
					  	vers.pb({v + p, i});
						}
					}
				}
			}	
		}
		if (v - p >= 0) {
			if (!was[v - p][p]) {
				was[v - p][p] = 1;
				dp[v - p][p] = dp[v][p] + 1;
				vers.pb({v - p, p});
				if (!have[v - p].empty()) {
					if (!was[v - p][have[v - p][0]]) {
						for (auto i : have[v - p]) {
					  	was[v - p][i] = 1;
					  	dp[v - p][i] = dp[v][p] + 1;
					  	vers.pb({v - p, i});
						}
					}
				}
			}	
		}
	}
	int out = inf;
	for (int i = 0; i < N; i++) out = min(out, dp[finish][i]);
	if (out == inf) out = -1;
	cout << out;
	return 0;	
}

Compilation message (stderr)

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:50:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
                        ^
skyscraper.cpp:54:25: 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: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43