Submission #130885

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
130885	2019-07-16 08:15:52	win11905	Valley (BOI19_valley)	C++11	100 / 100	327 ms	34852 KiB

valley

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#include <bits/stdc++.h>
#define long long long
#define pii pair<long, long>
#define x first
#define y second
using namespace std;
const long INF = 1e18;
const int N = 1e5+5;
int n, m, q, st;
int s[N], t[N], w[N];
int par[N][17], dep[N], id[N], rid[N];
long dist[N], cost[N], mnq[N][17];
vector<int> g[N];
void init_lca(int u, int p) {
    dep[u] = dep[p] + 1, par[u][0] = p;
    for(int i = 1; i < 17; ++i) par[u][i] = par[par[u][i-1]][i-1];
    for(int x : g[u]) {
        int v = s[x] ^ t[x] ^ u;
        if(v == p) continue;
        dist[v] = dist[u] + w[x];
        id[x] = v, rid[v] = x;
        init_lca(v, u);
    }
}
int get_lca(int a, int b) {
    if(dep[a] < dep[b]) swap(a, b);
 
 
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Compilation message (stderr)

valley.cpp: In function 'int main()':
valley.cpp:38:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d %d", &n, &m, &q, &st);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
valley.cpp:40:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d %d", s+i, t+i, w+i);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
valley.cpp:47:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &val);
         ~~~~~^~~~~~~~~~~~
valley.cpp:63:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &a, &b);
         ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 27 / 27
• Subtask 3: 23 / 23
• Subtask 4: 41 / 41