Submission #208734

#	Time	Username	Problem	Language	Result	Execution time	Memory
208734		E869120	Senior Postmen (BOI14_postmen)	C++14	55 / 100	554 ms	41436 KiB

postmen

#include <iostream>
#include <vector>
#include <set>
using namespace std;

struct Node {
	int to, cap, rev;
};

int N, M, A[500009], B[500009];
vector<Node> X[500009]; int cur[500009];
bool used[500009];

int vec[500009], sz;
int v1[500009], sz1;

int main() {
	scanf("%d%d", &N, &M);
	for (int i = 1; i <= M; i++) {
		scanf("%d%d", &A[i], &B[i]);
		X[A[i]].push_back(Node{ B[i], 1, (int)X[B[i]].size() });
		X[B[i]].push_back(Node{ A[i], 1, (int)X[A[i]].size() - 1 });
	}

	int num = M, cnt = 1;
	while (num > 0) {
		while (true) {
			while (cur[cnt] < X[cnt].size() && X[cnt][cur[cnt]].cap == 0) cur[cnt]++;
			if (cur[cnt] < X[cnt].size()) break;
			cnt++;
		}

		int cx = cnt; sz = 0;
		while (true) {
			vec[sz] = cx; sz++;
			int nex = -1, res = -1;
			while (X[cx][cur[cx]].cap == 0) cur[cx]++;
			nex = X[cx][cur[cx]].to;
			res = X[cx][cur[cx]].rev;
			X[cx][cur[cx]].cap = 0;
			X[nex][res].cap = 0;
			num--;
			if (nex == cnt) break;
			cx = nex;
		}
		vec[sz] = cnt; sz++;
		for (int i = 0; i < sz; i++) used[vec[i]] = false;

		sz1 = 0;
		for (int i = 0; i < sz; i++) {
			if (used[vec[i]] == true) {
				int num = 0;
				while (true) {
					int cp = v1[sz1 - 1]; if (num) printf(" ");
					printf("%d", cp); num++; used[cp] = false;
					sz1--;
					if (cp == vec[i]) break;
				}
				printf("\n");
			}
			used[vec[i]] = true;
			v1[sz1] = vec[i]; sz1++;
		}
	}
	return 0;
}

Compilation message (stderr)

postmen.cpp: In function 'int main()':
postmen.cpp:28:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    while (cur[cnt] < X[cnt].size() && X[cnt][cur[cnt]].cap == 0) cur[cnt]++;
           ~~~~~~~~~^~~~~~~~~~~~~~~
postmen.cpp:29:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if (cur[cnt] < X[cnt].size()) break;
        ~~~~~~~~~^~~~~~~~~~~~~~~
postmen.cpp:18:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &N, &M);
  ~~~~~^~~~~~~~~~~~~~~~
postmen.cpp:20:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &A[i], &B[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 38 / 38
• Subtask 2: 17 / 17
• Subtask 3: 0 / 45