Ctrip school recruitment – Dolphin baby of Ctrip Aquarium (c + +)


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Dolphin baby in Ctrip Aquarium

Title Description:

There are n cute dolphins in Ctrip aquarium. They are all 0 years old at the beginning, and the life span of each dolphin is m years,

And these little dolphins will give birth to a baby dolphin (1 < = birthyear [i] < = m) in birthyear [i], and each baby dolphin is 0 years old.

How many dolphins were there in Ctrip aquarium in X years?


N (initial number of dolphins)

M (dolphin life)

Number of years in which dolphins have babies (assuming P)

Year of dolphin birth 1

Year of birth P

X (after a few years)


How many dolphins will there be in X years

sample input


sample output



#include <iostream>
using namespace std;

int main()
    //N dolphin, dolphin life span m, number of years in which dolphins have babies P, x years later
    int n, m, p, x;
    //N1 refers to the existing dolphins, N2 refers to the dolphins that have existed together, including the dead ones, so the array size is defined
    int n1,n2;
    //Arr2 indicates how many years the dolphins came into the world, and the dead dolphins are - 1, which is defined as large enough to store
    int arr2[99999];
    cin >> n >> m >> p;
    n1 = n2 = n ;
    //Arr1 to store the year of birth
    int arr1[p];
    //Enter the year of birth
    for(int i = 0; i < p; i++){
        cin >> arr1[i];
    cin >> x;
    //Initialize the first few years of dolphins coming into the world. Initialize to 1, indicating the first year
    for(int i = 0; i < n; i++){
        arr2[i] = 1;
    //Enter the year cycle, X cycles, indicating the past x years
    for(int i = 1; i <= x; i++){
        //The year of each year cycle
        for(int j = 0; j < n2; j++){
            //If the dolphin's year is - 1, it means it has died
            if(arr2[j] == -1)continue;
            //The year in which the dolphin gave birth
            for(int k = 0; k < p; k++){
                //If so
                if(arr2[j] == arr1[k]){
                    arr2[n2-1] = 0;
            //When the life is up, it is set to - 1. Because the initial age is 0, the age is equal to the year of existence - 1
            if(arr2[j] - 1 == m){
                arr2[j] = -1;
    cout << n1 << endl;
    return 0 ;

Such problems are encountered, but they are still not solved after reading the article,
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