#include <stdio.h>
#include <unistd.h>
 #include <sys/wait.h>

int main(int argc, char* argv[]) {

    int pipefd[argc - 2][2];
    for (int i = 0; i < argc - 1; i++) {
        pipe(pipefd[i]);
    }

    pid_t childs[argc - 1];
    for (int i = 1; i < argc; i++) {
        char* cmd = argv[i];
        childs[i-1] = fork();
        if (childs[i-1] == 0) {
            if (i-2 >= 0) {
                close(pipefd[i-2][1]);
                dup2(pipefd[i-2][0], 0);
                close(pipefd[i-2][0]);
            }
            if (i-1 <= argc-3) {
                close(pipefd[i-1][0]);
                dup2(pipefd[i-1][1], 1);
                close(pipefd[i-1][1]);
            }
            execlp(cmd, cmd, NULL);
            return 1;
        } else {
            close(pipefd[i-2][1]);
            close(pipefd[i-2][0]);
        }
    }

    for (int i = 0; i < argc-1; i++) {
        waitpid(childs[i], NULL, 0);
    }
}