Submission #446543

#	Time	Username	Problem	Language	Result	Execution time	Memory
446543		ComPhyPark	Parachute rings (IOI12_rings)	C++14	0 / 100	2406 ms	156100 KiB

rings

#include<cstdio>
#include<vector>
using namespace std;
const int SZ = 1000010;
int min(int a, int b) { return a < b ? a : b; }
int n;
const bool ifDebug = false;
int cycleNum;
vector<int>l[SZ];
typedef struct Graph {
	int st[4], ts[3];
	int p[SZ], sz[SZ], ln[SZ], c[SZ];
	bool i3[SZ];
	int x;
	bool isMain;
	void init() {
		x = n;
		isMain = true;
		st[0] = ts[0] = n;
		st[1] = st[2] = st[3] = ts[1] = ts[2] = 0;
		for (int i = 0; i < n; i++) {
			i3[i] = false;
			p[i] = i;
			sz[i] = 1;
			ln[i] = c[i] = 0;
		}
	}
	void init(int X) {
		if (ifDebug)printf("init(%d)\n", X);
		init();
		isMain = false;
		x = X;
		PR();
		for (int i = 0; i < n; i++) {
			for (int e : l[i]) {
				if (e < i)Link(e, i);
			}
		}
	}
	int f(int a) {
		return a == p[a] ? a : p[a] = f(p[a]);
	}
	void u(int A, int B) {
		int a = f(A), b = f(B);
		if (a != b) {
			p[b] = a;
			ts[gT(a)]--;
			ts[gT(b)]--;
			ln[a] += ln[b];
			sz[a] += sz[b];
		}
		else {
			ts[gT(a)]--;
		}
	}
	void Con(int A, int B) {
		int a = f(A);
		st[min(c[A], 3)]--;
		if (isMain)l[A].push_back(B);
		c[A]++;
		if (c[A] >= 3)i3[a] = true;
		st[min(c[A], 3)]++;
	}
	int gT(int a) {
		if (i3[a]) {
			return 2;
		}
		else if (sz[a] == ln[a]) {
			return 1;
		}
		else {
			return 0;
		}
	}
	void Link(int A, int B) {
		if (A == x || B == x)return;
		if (ifDebug)printf("%d:%d-%d\n", x, A, B);
		u(A, B);
		Con(A, B);
		Con(B, A);
		int a = f(A);
		ln[a]++;
		ts[gT(a)]++;
	}
	bool isChain() {
		return (ts[1] + ts[2] == 0);
	}
	void PR() {
		if (!ifDebug)return;
		printf("-------%d-------\n", x);
		for (int a = 0; a < n; a++) {
			printf("(%d)", c[a]);
			if (a == p[a]) {
				printf("[%d(%d,%d)]", a, sz[a], gT(a));
				//for (int b = 0; b < 4; b++)printf(" %d", cs[a][b]);
				printf("\n");
			}
			else {
				printf("%d->%d\n", a, f(a));
			}
		}
		printf("-----------------\n");
	}
}Graph;
Graph MG;
vector<Graph>GV;
//type: 0-chain/1-cycle/2-3 exists/3-4 exists
void Init(int N) {
	cycleNum = n = N;
	MG.init();
}
void Link(int A, int B) {
	bool p = (MG.st[3] == 0);
	MG.Link(A, B);
	for (int i = 0; i < GV.size(); i++) {
		GV[i].Link(A, B);
	}
	if (MG.gT(MG.f(A)) == 1)cycleNum = MG.f(A);
	if (MG.gT(MG.f(B)) == 1)cycleNum = MG.f(B);
	if (p && MG.st[3]) {
		if (ifDebug)printf("걸렸구나!!!!!!!!!\n");
		int a = A;
		if (l[A].size() < 3)a = B;
		GV.resize(l[a].size() + 1);
		GV[l[a].size()].init(a);
		for (int i = 0; i < l[a].size(); i++) {
			GV[i].init(l[a][i]);
		}
	}
}
int CountCritical() {
	if (MG.ts[2]) {
		if (ifDebug)printf(">=3 Exists");
		int r = 0;
		for (int i = 0; i < GV.size(); i++) {
			if (GV[i].isChain())r++;
		}
		return r;
	}
	else if (MG.ts[1]) {
		if (ifDebug)printf("cycle Exists");
		if (MG.ts[1] > 1)return 0;
		return MG.sz[cycleNum];
	}
	else {
		if (ifDebug)printf("Already Chain");
		return n;
	}
}

Compilation message (stderr)

rings.cpp: In function 'void Link(int, int)':
rings.cpp:115:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Graph>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  115 |  for (int i = 0; i < GV.size(); i++) {
      |                  ~~^~~~~~~~~~~
rings.cpp:126:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  126 |   for (int i = 0; i < l[a].size(); i++) {
      |                   ~~^~~~~~~~~~~~~
rings.cpp: In function 'int CountCritical()':
rings.cpp:135:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Graph>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  135 |   for (int i = 0; i < GV.size(); i++) {
      |                   ~~^~~~~~~~~~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 17
• Subtask 3: 0 / 18
• Subtask 4: 0 / 14
• Subtask 5: 0 / 31