Submission #1136116

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1136116	2025-01-15 00:35:57	lopkus	Two Currencies (JOI23_currencies)	C++20	100 / 100	1227 ms	28360 KiB

currencies

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#include<bits/stdc++.h>
using namespace std;
int n,m,q;
vector<int>a[100010];
int pr[20][100010];
int h[100010];
int cr=0;
int nums[100010],tail[100010];
void pre(int i,int c){
    cr++;
    nums[i]=cr;
    h[i]=h[c]+1;
    pr[0][i]=c;
    for(int o=1;o<17;o++){
        pr[o][i]=pr[o-1][pr[o-1][i]];
    }
    for(auto o:a[i]){
        if(o!=c)pre(o,i);
    }
    tail[i]=cr;
}
int lca(int i,int j){
    if(h[i]>h[j])swap(i,j);
    for(int o=16;o>=0;o--){
        if(h[i]+(1<<o)<=h[j])j=pr[o][j];
    }
    if(i==j)return i;
    for(int o=16;o>=0;o--){
        if(pr[o][i]!=pr[o][j]){
            i=pr[o][i];
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

currencies.cpp: In function 'int main()':
currencies.cpp:110:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  110 |         freopen("c.INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~
currencies.cpp:111:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  111 |         freopen("c.OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 28 / 28
• Subtask 3: 30 / 30
• Subtask 4: 32 / 32