#include <sourcemod>
#include <cstrike>

g_playerKills[65] = { 0, ... };

public Plugin myinfo = {
  name = "Best Player",
  author = "adma",
  description = ".",
  version = "1.0",
  url = ""
};

public void OnPluginStart() {
  HookEvent("player_death", player_death);
  HookEvent("round_end", round_end);
}

public void OnClientDisconnect(int client) {
  g_playerKills[client] = 0;
}

public void player_death(Event event, const char[] name, bool dontBroadcast) {
  int attacker = GetClientOfUserId(event.GetInt("attacker"));
  int client = GetClientOfUserId(event.GetInt("userid"));
  if (attacker <= 0 || attacker == client) return;
  g_playerKills[client]++;
}

public void round_end(Event event, const char[] name, bool dontBroadcast) {
  int max = -1, bestPlayer = -1;
  for (int i = 1; i <= MaxClients; ++i) {
    if (!IsClientInGame(i)) return;
    int contributionScore = CS_GetClientContributionScore(i);
    if (contributionScore > max) {
      max = contributionScore;
      bestPlayer = i;
    }
  }

  char bestMessage[64];
  if (bestPlayer != -1) Format(bestMessage, sizeof(bestMessage), "The best player was %N", bestPlayer);

  for (int i = 1; i <= MaxClients; ++i) {
    if (IsClientInGame(i) && !IsFakeClient(i)) {
      int contributionScore = CS_GetClientContributionScore(i);
      SetHudTextParams(-1.0, -1.0, 5.0, 255, 255, 255, 255);
      ShowHudText(i, -1, "%s\nYou killed %i players\nYour score is %i", bestMessage, g_playerKills[i], contributionScore);
    }

    g_playerKills[i] = 0;
  }
}