Submission #586312

#	Time	Username	Problem	Language	Result	Execution time	Memory
586312		SeDunion	Friend (IOI14_friend)	C++17	Compilation error	0 ms	0 KiB

friend

#include "friend.h"
#include<iostream>

const int N = 1e6 + 123;

int dsu[N];
int val[N];

int get(int x) {
	if (x == dsu[x]) return x;
	return dsu[x] = get(dsu[x]);
}

int findSample(int n,int confidence[],int host[],int protocol[]){
	for (int i = 0 ; i < n ; ++ i) {
		dsu[i] = i;
		val[i] = confidence[i];
	}
	for (int i = 1 ; i < n ; ++ i) {
		int j = host[i];
		int x = get(i), y = get(j);
		if (x == y) continue;
		dsu[x] = y;
		val[y] = max(val[y], val[x]);
	}
	int ans = 0;
	for (int i = 0 ; i < n ; ++ i) {
		int j = get(i);
		ans += val[j];
		val[j] = 0;
	}
	return ans;
}

Compilation message (stderr)

friend.cpp: In function 'int findSample(int, int*, int*, int*)':
friend.cpp:24:12: error: 'max' was not declared in this scope; did you mean 'std::max'?
   24 |   val[y] = max(val[y], val[x]);
      |            ^~~
      |            std::max
In file included from /usr/include/c++/10/bits/char_traits.h:39,
                 from /usr/include/c++/10/ios:40,
                 from /usr/include/c++/10/ostream:38,
                 from /usr/include/c++/10/iostream:39,
                 from friend.cpp:2:
/usr/include/c++/10/bits/stl_algobase.h:300:5: note: 'std::max' declared here
  300 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~