50161. Memory Game

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

#define max(a,b) ((a)>(b)?(a):(b))
#define min(a,b) ((a)<(b)?(a):(b))

int n;
int memory[105];

int main(){
    scanf("%d", &n);
    for(int i = 1; i <= 100; i++) memory[i] = -1;

    for(int i = 0; i < n; i++){
        int now_num; scanf("%d", &now_num);
        if(memory[now_num] == -1){
            printf("%d\n", i);
            memory[now_num] = i;
        }
        else{
            printf("%d %d %d\n", i, memory[now_num], now_num);
            memory[now_num] = -1;
        }
    }
}