#include <iostream>
#include <vector>
#include <algorithm>
#include <array>
using namespace std;
using ll = long long;
template <typename T, int sz>
using ar = array<T, sz>;
const int N = 505, M = 1010;
int n, m, q, ds[N];
ll mst;
ar<int, 3> e[M];
int ds_find(int i) {
return (ds[i] < 0) ? i : (ds[i] = ds_find(ds[i]));
}
void ds_unite(int i, int j, int w) {
i = ds_find(i);
j = ds_find(j);
if (i == j) return;
mst += w;
if (-ds[i] > -ds[j]) swap(i, j);
ds[j] += ds[i];
ds[i] = j;
}
int main() {
scanf("%d%d", &n, &m);
for (int i = 0; i < m; ++i)
scanf("%d%d%d", &e[i][1], &e[i][2], &e[i][0]);
sort(e, e+m);
scanf("%d", &q);
for (int x, i = 0; i < q; ++i) {
scanf("%d", &x);
memset(ds, -1, sizeof * ds * (n + 1));
mst = 0;
int pl, pr;
pr = lower_bound(e, e + m, ar<int, 3>{x, -1, -1}) - e;
pl = pr - 1;
while (pl >= 0 or pr < m) {
if (pl == -1 or pr < m and e[pr][0] - x < x - e[pl][0])
ds_unite(e[pr][1], e[pr][2], e[pr][0] - x), ++pr;
else
ds_unite(e[pl][1], e[pl][2], x - e[pl][0]), --pl;
}
printf("%lld\n", mst);
}
}
Compilation message
reconstruction.cpp: In function 'int main()':
reconstruction.cpp:42:9: error: 'memset' was not declared in this scope
42 | memset(ds, -1, sizeof * ds * (n + 1));
| ^~~~~~
reconstruction.cpp:4:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
3 | #include <algorithm>
+++ |+#include <cstring>
4 | #include <array>
reconstruction.cpp:50:36: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
50 | if (pl == -1 or pr < m and e[pr][0] - x < x - e[pl][0])
reconstruction.cpp:34:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
34 | scanf("%d%d", &n, &m);
| ~~~~~^~~~~~~~~~~~~~~~
reconstruction.cpp:36:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
36 | scanf("%d%d%d", &e[i][1], &e[i][2], &e[i][0]);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
reconstruction.cpp:38:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
38 | scanf("%d", &q);
| ~~~~~^~~~~~~~~~
reconstruction.cpp:40:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
40 | scanf("%d", &x);
| ~~~~~^~~~~~~~~~
