3SUM

input/code.cpp: In function 'int main(int, char**)':
input/code.cpp:14:21: warning: comparison of integer expressions of different signedness: 'long int' and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for (long a=1; a<nums.size()-2; a++) {
      |                    ~^~~~~~~~~~~~~~
input/code.cpp:15:25: warning: comparison of integer expressions of different signedness: 'long int' and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |         for (long b=2; b<nums.size()-1; b++) {
      |                        ~^~~~~~~~~~~~~~
input/code.cpp:16:29: warning: comparison of integer expressions of different signedness: 'long int' and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |             for (long c=3; c<nums.size(); c++) {
      |                            ~^~~~~~~~~~~~

#include <iostream>
#include <vector>


int main(int argc, char **argv) {
    long n, q;
    std::cin >> n >> q;

    std::vector<long> nums(n+1);
    for (int i=0; i<=n; i++) {
        std::cin >> nums[i]; 
    }

    for (long a=1; a<nums.size()-2; a++) {
        for (long b=2; b<nums.size()-1; b++) {
            for (long c=3; c<nums.size(); c++) {
                if (nums.at(a) + nums.at(b) + nums.at(c) == q) {
                    std::cout << a << " " << b << " " << c << std::endl;
                    return 0;
                }
            }
        }
    }

    std::cout << "IMPOSSIBLE" << std::endl;

    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: ACCEPTED

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: ACCEPTED

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: ACCEPTED

Test 10

Verdict: TIME LIMIT EXCEEDED

Test 11

Verdict: TIME LIMIT EXCEEDED

Test 12

Verdict: TIME LIMIT EXCEEDED

Test 13

Verdict: TIME LIMIT EXCEEDED

Test 14

Verdict: TIME LIMIT EXCEEDED

Test 15

Verdict: TIME LIMIT EXCEEDED

Test 16

Verdict: TIME LIMIT EXCEEDED

Test 17

Verdict: TIME LIMIT EXCEEDED

Test 18

Verdict: TIME LIMIT EXCEEDED

Test 19

Verdict: TIME LIMIT EXCEEDED

Test 20

Verdict: TIME LIMIT EXCEEDED

Test 21

Verdict: TIME LIMIT EXCEEDED

Test 22

Verdict: TIME LIMIT EXCEEDED

Test 23

Verdict: ACCEPTED