Lennot

input/code.cpp: In function 'int main()':
input/code.cpp:46:7: warning: unused variable 'from' [-Wunused-variable]
   ull from, to, cost;
       ^
input/code.cpp:46:13: warning: unused variable 'to' [-Wunused-variable]
   ull from, to, cost;
             ^
input/code.cpp:46:17: warning: unused variable 'cost' [-Wunused-variable]
   ull from, to, cost;
                 ^

#include <iostream>
#include <string>
#include <sstream>

#define ull unsigned long long

void search( ull from, ull cityCount, ull pathCount, ull** paths, ull cost, ull length, ull& cheapest )
{
	for ( ull i = 0; i < pathCount; ++i )
	{
		if ( paths[ i ][ 0 ] == from )
		{
			if ( paths[ i ][ 1 ] == cityCount )
			{
				if ( cost + paths[ i ][ 2 ] < cheapest )
				{
					cheapest = cost + paths[ i ][ 2 ];
				}
			}
			else if ( length < cityCount * 2 && cost < cheapest )
			{
				if ( ( length ) % 2 == 0 )
				{
					search( paths[ i ][ 1 ], cityCount, pathCount, paths, cost + paths[ i ][ 2 ], length + 1, cheapest );
				}
				else
				{
					search( paths[ i ][ 1 ], cityCount, pathCount, paths, cost, length + 1, cheapest );
				}
			}			
		}
	}
}

int main()
{
	std::ios_base::sync_with_stdio( false );

	ull cityCount, pathCount;
	std::cin >> cityCount >> pathCount;

	ull** paths = new ull*[ pathCount ];

	for ( ull i = 0; i < pathCount; ++i )
	{
		ull from, to, cost;
		paths[ i ] = new ull[ 3 ];
		std::cin >> paths[ i ][ 0 ] >> paths[ i ][ 1 ] >> paths[ i ][ 2 ];
	}

	ull cost = 0;
	ull cheapest = -1;
	search( 1, cityCount, pathCount, paths, cost, 0, cheapest );

	std::cout << cheapest << "\n";
	
	for ( ull i = 0; i < pathCount; ++i )
	{
		delete[] paths[ i ];
	}

	delete[] paths;
	return 0;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: WRONG ANSWER

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 7

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 8

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 9

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 10

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 11

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 15

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 16

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 17

Group: 3

Verdict: TIME LIMIT EXCEEDED