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1389.cpp
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1389.cpp
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#define _CRT_SECURE_NO_WARNINGS
#include <cstdio>
#include <memory.h>
#define MIN(a,b) ((a<b)?a:b);
int user[101][101];
int N, M;
int floyd() {
int sum[101];
memset(sum, 0, sizeof(sum));
for (int i = 1; i <= N; i++) {
user[i][i] = 0;
}
for (int k = 1; k <= N; k++) {
for (int i = 1; i <= N; i++) {
for (int j = 1; j <= N; j++) {
if (user[i][k] && user[k][j])
user[i][j] = MIN(user[i][j], user[i][k] + user[k][j]);
}
}
}
int min = 987654321;
int index = 0;
for (int i = 1; i <= N; i++) {
for (int j = 1; j <= N; j++) {
if (i == j) continue;
sum[i] += user[i][j];
}
if (min > sum[i]) {
min = sum[i];
index = i;
}
min = MIN(min, sum[i]);
}
return index;
}
int main(void){
int a, b;
scanf("%d%d", &N, &M);
for (int i = 1; i <= N; i++) {
for (int j = 1; j <= N; j++) {
user[i][j] = 987654321;
}
}
for (int i = 1; i <= M; i++) {
scanf("%d%d", &a, &b);
user[a][b] = 1;
user[b][a] = 1;
}
printf("%d\n", floyd());
return 0;
}