3SUM

#include <algorithm>
#include <iostream>
#include <vector>
#include <climits>
#include <cstdint>

using namespace std;
#define DEBUG std::cout<<"LINE"<<__LINE__;
#define IN(A) int A;std::cin>>A;

template<typename T> void printV(vector<T> V) {
    for (int i=0;i<V.size()-1;i++) {
        cout<<V[i]<<" ";
    }

    cout<<V[V.size()-1];
    cout<<endl;
}
int64_t max3(int64_t a,int64_t b,int64_t c) {
    return max(a,max(b,c));
}
struct compute {
    int tests=1;
    vector<pair<int,int>> data;


    vector<bool> visited;
    bool start() {
        IN(n);
        IN(x);

        data.assign(n,{});
        readV(n);
        std::sort(data.begin(),data.end());
        for (int i=data.size()-1;i>1;i--) {
            for (int j=i-1;j>0;j--) {
                int a=0;
                int b=j-1;
                int v=x-data[i].first-data[j].first;
                if (v<1) continue;
                while (a<=b) {
                    int k=(a+b)/2;
                    if (data[k].first==v) {
                        cout<<data[i].second<<" "<<data[j].second<<" "<<data[k].second<<endl;
                        return true;
                    }
                    if (data[k].first>v) {
                        a=k+1;
                    } else {
                        b=k-1;
                    }

                }
            }
        }
        cout<<"IMPOSSIBLE"<<endl;
        return true;
    }
    void readV(int n) {
        for (int i=0;i<n;i++) {
            cin>>data[i].first;
            data[i].second=i+1;
        }
    }

    void testloop(){
        while (tests-->0) {
            start();
        }
    }
};

int main() {
    compute comp;
    comp.start();


}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: WRONG ANSWER

Test 12

Verdict: WRONG ANSWER

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: WRONG ANSWER

Test 17

Verdict: WRONG ANSWER

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: WRONG ANSWER

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED