Submission #20887

#	Time	Username	Problem	Language	Result	Execution time	Memory
20887		14kg	Jakarta Skyscrapers (APIO15_skyscraper)	C++11	100 / 100	153 ms	33036 KiB

skyscraper

#include <stdio.h>
#include <vector>
#include <queue>
#define N 30001
#define minus(x,y) (y?-(x):x)
#define Abs(x) (x>0?x:-(x))
#define LIMIT 1000

using namespace std;
typedef pair<int, pair<int, int> > pip;
int n, m, sw, ew, d[N];
bool check[N];
bool check2[N][LIMIT + 1];
vector<int> V[N];
queue<pip> Q;

int main() {
	int x, y;
	int w, p, c;

	scanf("%d %d", &m, &n);
	for (int i = 1; i <= n; i++) {
		scanf("%d %d", &x, &y);
		V[++x].push_back(y);
		if (i == 1) sw = x;
		if (i == 2) ew = x;
	}

	Q.push({ 0,{ sw,m + 1 } });
	while (!Q.empty()) {
		c = Q.front().first;
		w = Q.front().second.first;
		p = Q.front().second.second;
		Q.pop();

		if (check[ew]) break;
		if (Abs(p) <= LIMIT) {
			if(check2[w][Abs(p)]) continue;
			check2[w][Abs(p)] = true;
		}
		if (1 <= w + p && w + p <= m) Q.push({ c + 1,{ w + p,p } });
		if (!check[w]) {
			check[w] = true, d[w] = c;
			for (auto i : V[w]) {
				if (1 <= w + i && w + i <= m) Q.push({ c + 1,{ w + i,i } });
				if (1 <= w - i && w - i <= m) Q.push({ c + 1,{ w - i,-i } });
			}
		}
	} printf("%d", check[ew] ? d[ew] : -1);
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:21:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &m, &n);
                        ^
skyscraper.cpp:23:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &x, &y);
                         ^

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