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3numbers.cpp 1.19 KB
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nbanati 提交于 2018-10-03 00:20 +08:00 . issue #231
// C++ program to find a triplet
#include <bits/stdc++.h>
using namespace std;
// returns true if there is triplet with sum equal
// to 'sum' present in A[]. Also, prints the triplet
bool find3Numbers(int A[], int arr_size, int sum)
{
int l, r;
/* Sort the elements */
sort(A, A + arr_size);
/* Now fix the first element one by one and find the
other two elements */
for (int i = 0; i < arr_size - 2; i++) {
// To find the other two elements, start two index
// variables from two corners of the array and move
// them toward each other
l = i + 1; // index of the first element in the
// remaining elements
r = arr_size - 1; // index of the last element
while (l < r) {
if (A[i] + A[l] + A[r] == sum) {
printf("Triplet is %d, %d, %d", A[i],
A[l], A[r]);
return true;
}
else if (A[i] + A[l] + A[r] < sum)
l++;
else // A[i] + A[l] + A[r] > sum
r--;
}
}
// If we reach here, then no triplet was found
return false;
}
/* Driver program to test above function */
int main()
{
int A[] = { 1, 4, 45, 6, 10, 8 };
int sum = 22;
int arr_size = sizeof(A) / sizeof(A[0]);
find3Numbers(A, arr_size, sum);
return 0;
}
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