Submission #523218

#	Time	Username	Problem	Language	Result	Execution time	Memory
523218		LptN21	Bridges (APIO19_bridges)	C++14	13 / 100	3039 ms	2856 KiB

bridges

#include <bits/stdc++.h>
using namespace std;
#define fastIO ios_base::sync_with_stdio(false), cin.tie(NULL);
#define PI acos(-1.0)
#define eps 1e-9
#define FF first
#define SS second
// VECTOR (6)
#define pb push_back
#define lb lower_bound
#define ub upper_bound
#define sz(v) int((v).size())
#define all(v) (v).begin(), (v).end()
#define uniq(v) sort(all( (v) )), (v).resize( unique(all( (v) )) - (v).begin() );
// BIT (6)
#define CNTBIT(x) __builtin_popcountll(x)
#define ODDBIT(x) __builtin_parityll(x)
#define MASK(i) (1LL<<(i))
#define BIT(x, i) (((x)>>(i))&1)
#define SUBSET(big, small) (((big)&(small))==(small))
#define MINBIT(x) (x)&(-x)
#define FIRSTBIT(x) __builtin_ctzll(x)
//typedef
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, int> ii;

/* */
template<class T>
bool minimize(T &a, const T &b) {
    if(a > b) {a = b; return 1;}
    return 0;
}
template<class T>
bool maximize(T &a, const T &b) {
    if(a < b) {a = b; return 1;}
    return 0;
}
/* */

/* CODE BELOW */
const int N = 5e4 + 7, M = 1e5 + 7;
const int oo = 1e9 + 7;
const int MOD = 1e9 + 7;

int n, m, q, t;

//const int B = 1000; // size block

struct Edge{
    int u, v, w;
    bool operator<(const Edge &e) const {
        if(w != e.w) return w < e.w;
        if(u != e.u) return u < e.u;
        return v < e.v;
    }
} e[M];

int dsu[N];
int root(int u) {
    return (dsu[u]<0?u:dsu[u]=root(dsu[u]));
}
bool join(int u, int v) {
    if((u=root(u)) == (v=root(v))) return 0;
    if(dsu[u] > dsu[v]) swap(u, v);
    dsu[u]+= dsu[v], dsu[v] = u; return 1;
}

signed main() {
    //freopen("test.inp", "r", stdin);
    //freopen("test.out", "w", stdout);
    //fastIO;
    scanf("%d%d", &n, &m);
    int u, v, w;
    for(int i=1;i<=m;i++) {
        scanf("%d%d%d", &u, &v, &w);
        e[i] = {u, v, w};
    }
    scanf("%d", &q);
    for(int i=1;i<=q;i++) {
        scanf("%d%d%d", &t, &u, &w);
        if(t == 1) e[u].w = w;
        if(t == 2) {
            memset(dsu, -1, sizeof(int)*(n+1));
            for(int j=1;j<=m;j++) if(e[j].w>=w) {
                join(e[j].u, e[j].v);
            }
            printf("%d\n", -dsu[root(u)]);
        }
    }

    return 0;
}

Compilation message (stderr)

bridges.cpp: In function 'int main()':
bridges.cpp:74:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
bridges.cpp:77:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         scanf("%d%d%d", &u, &v, &w);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~
bridges.cpp:80:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |     scanf("%d", &q);
      |     ~~~~~^~~~~~~~~~
bridges.cpp:82:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         scanf("%d%d%d", &t, &u, &w);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 0 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 14
• Subtask 5: 0 / 13
• Subtask 6: 0 / 27