Submission #84743

#	Time	Username	Problem	Language	Result	Execution time	Memory
84743		kjh5678	두 로봇 (KOI18_robot)	C++98	0 / 100	71 ms	12280 KiB

robot

#if 01
#include <stdio.h>
#define MAX(x,y) ((x>y)?(x):(y))
int N, r1, r2;

typedef struct _idxarr
{
	int node;
	int dist;
	_idxarr* next;
	_idxarr(){ node = dist = 0; next = (_idxarr*)0; };
	_idxarr(int a, int b, _idxarr* c){ node = a; dist = b; next = c; }
}ia;

ia arr[100101];
int dist[100101];
int max[100101];
bool visit[100101];

void input()
{
	scanf("%d %d %d", &N, &r1, &r2);
	for (int i = 1; i <= N; i++)
	{
		int x, y, v;
		scanf("%d%d%d", &x, &y, &v);
		arr[x].next = new ia(y, v, arr[x].next);

		arr[y].next = new ia(x, v, arr[y].next);
	}
}

void DFS(int node, int d, int m)
{
	dist[node] = d;
	max[node] = m;
	visit[node] = true;
	for (ia* src = &arr[node]; src->next; src = src->next)
	{
		if (visit[src->next->node]) continue;
		DFS(src->next->node, d + src->next->dist, MAX(m, src->next->dist));
	}
}


int main()
{
	input();
	if (r1 == r2) { printf("0"); return 0; }
	DFS(r1, 0, 0);

	printf("%d", dist[r2] - max[r2]);

	return 1;
}

#endif

Compilation message (stderr)

robot.cpp: In function 'void input()':
robot.cpp:22:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d", &N, &r1, &r2);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
robot.cpp:26:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d", &x, &y, &v);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 17
• Subtask 2: 0 / 19
• Subtask 3: 0 / 23
• Subtask 4: 0 / 41