Submission #1094314

#	Time	Username	Problem	Language	Result	Execution time	Memory
1094314		Sunbae	A Plus B (IOI23_aplusb)	C++17	Compilation error	0 ms	0 KiB

aplusb

#include <cstdio>
#include <vector>
#include <algorithm>
//#include "aplusb.h"
typedef long long ll;
using namespace std;
const int N = 1e5 + 5;
vector<int> smallest_sums(int n, vector<int> A, vector<int> B) {
	ll low = A[0] + B[0], high = A[n-1] + B[n-1], ans;
	while(low <= high){
		ll mid = low + ((high-low)>>1), cnt = 0;
		for(int i = 0; i<n; ++i){
			cnt += upper_bound(B.begin(), B.end(), mid-A[i]) - B.begin();
		}
		if(cnt >= n) high = mid-1, ans = mid;
		else low = mid+1;
	}
	vector<int> v(n);
	for(int i = 0, m = 0; i<n; ++i){
		for(int j = 0; A[i] + B[j] <= ans && j<n; ++j){
			v[m++] = A[i] + B[j];
		}
	}
	return v;
}

signed main(){
	int n; scanf("%d", &n);
	vector<int> A(n), B(n);
	for(int i = 0, x; i<n; ++i) scanf("%d", &x), A[i] = x;
	for(int i = 0, x; i<n; ++i) scanf("%d", &x), B[i] = x;
	vector<int> v = smallest_sums(n, A, B);
	for(int x: v) printf("%d ", x);
}

Compilation message (stderr)

aplusb.cpp: In function 'int main()':
aplusb.cpp:28:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |  int n; scanf("%d", &n);
      |         ~~~~~^~~~~~~~~~
aplusb.cpp:30:35: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |  for(int i = 0, x; i<n; ++i) scanf("%d", &x), A[i] = x;
      |                              ~~~~~^~~~~~~~~~
aplusb.cpp:31:35: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |  for(int i = 0, x; i<n; ++i) scanf("%d", &x), B[i] = x;
      |                              ~~~~~^~~~~~~~~~
aplusb.cpp: In function 'std::vector<int> smallest_sums(int, std::vector<int>, std::vector<int>)':
aplusb.cpp:20:37: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   20 |   for(int j = 0; A[i] + B[j] <= ans && j<n; ++j){
/usr/bin/ld: /tmp/ccfTdIRa.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc0zDRgb.o:aplusb.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status