Submission #1043335

#TimeUTC-0UsernameProblemLanguageResultExecution timeMemory
10433352024-08-04 08:25:58khanhtbRailway (BOI17_railway)C++14
100 / 100
77 ms27340 KiB
#pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define ld long double
#define pb push_back
#define pf push_front
#define vi vector<ll>
#define vii vector<vi>
#define pll pair<ll, ll>
#define vpll vector<pll>
#define all(a) a.begin(), a.end()
#define fi first
#define se second
using namespace std;
const ll mod = 1e9+7;
const ll inf = 2e18;
const ll blocksz = 320;
const ll N = 1e5+8;
int n,m,k;
vector<pair<int,int>> g[N];
int h[N],up[N][20],tin[N],tdfs;
void dfs_pre(int u, int p){
tin[u] = ++tdfs;
for(pair<int,int> ed:g[u]){
int v = ed.fi;
if(v == p) continue;
h[v] = h[u]+1;
up[v][0] = u;
for(int i = 1; i < 20; i++) up[v][i] = up[up[v][i-1]][i-1];
 
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Compilation message (stderr)

railway.cpp: In function 'void solve()':
railway.cpp:83:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   83 |         for(int i = 1; i < s.size(); i++){
      |                        ~~^~~~~~~~~~
railway.cpp: In function 'int main()':
railway.cpp:98:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   98 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
railway.cpp:99:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   99 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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