Submission #386591

#	Time	Username	Problem	Language	Result	Execution time	Memory
386591		Kepha	Crocodile's Underground City (IOI11_crocodile)	C++11	100 / 100	809 ms	64480 KiB

crocodile

#include "crocodile.h"
#include<algorithm>
#include<vector>
using namespace std;
vector<int>E[100100], Len[101000];
bool chk[101000];
struct HP{
	int d, num;
	bool operator<(const HP &p)const{
		return d>p.d;
	}
}Heap[8000100];
int D[100100][2], top;
void Add(int a, int b){
	if (D[a][1] <= b)return;
	if (D[a][0] > b){
		D[a][1] = D[a][0]; D[a][0] = b;
	}
	else if (D[a][1] > b)D[a][1] = b;
	Heap[top].d = b;
	Heap[top].num = a;
	top++;
	push_heap(Heap, Heap + top);
}
int travel_plan(int N, int M, int R[][2], int L[], int K, int P[])
{
	int i, x;
	HP t;
	for (i = 0; i < M; i++){
		E[R[i][0]].push_back(R[i][1]);
		E[R[i][1]].push_back(R[i][0]);
		Len[R[i][0]].push_back(L[i]);
		Len[R[i][1]].push_back(L[i]);
	}
	for (i = 0; i < N; i++)D[i][0] = D[i][1] = 2100000000;
	top = 0;
	for (i = 0; i < K; i++){
		D[P[i]][0] = 0;
		Add(P[i], 0);
	}
	while (1){
		while (top){
			t = Heap[0];
			if (D[t.num][1] == t.d && !chk[t.num])break;
			pop_heap(Heap, Heap + top);
			top--;
		}
		chk[t.num] = true;
		if (t.num == 0)break;
		pop_heap(Heap, Heap + top);
		top--;
		for (i = 0; i < E[t.num].size(); i++){
			Add(E[t.num][i], t.d + Len[t.num][i]);
		}
	}
	return D[0][1];
}

Compilation message (stderr)

crocodile.cpp: In function 'int travel_plan(int, int, int (*)[2], int*, int, int*)':
crocodile.cpp:52:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |   for (i = 0; i < E[t.num].size(); i++){
      |               ~~^~~~~~~~~~~~~~~~~
crocodile.cpp:27:9: warning: unused variable 'x' [-Wunused-variable]
   27 |  int i, x;
      |         ^
crocodile.cpp:49:3: warning: 't.HP::num' may be used uninitialized in this function [-Wmaybe-uninitialized]
   49 |   if (t.num == 0)break;
      |   ^~
crocodile.cpp:53:7: warning: 't.HP::d' may be used uninitialized in this function [-Wmaybe-uninitialized]
   53 |    Add(E[t.num][i], t.d + Len[t.num][i]);
      |    ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 46 / 46
• Subtask 2: 43 / 43
• Subtask 3: 11 / 11