题目解答？

#include <iostream>
#include <vector>

using namespace std;

int main() {
int n, m;
cin >> n >> m;

vector<int> tasks(m);
for (int i = 0; i < m; ++i) {
    cin >> tasks[i];
}

int current = 1;
long long time = 0;  

for (int target : tasks) {
    if (target >= current) {
        time += target - current;
    } else {
        time += (n - current) + target;
    }
    current = target;
}

cout << time << endl;

return 0;

}