只需要按题目要求顺序遍历数组，还原序列

自己写的，写了一个半小时 ！

执行用时：2ms 内存消耗：1.39MB 击败了100.00%的用户 击败了100.00%的用户 #include <unistd.h> static char inBuf[1 << 10]; static int inLen = 0, inPos = 0; inline int readChar() { if (inPos == inLen) { inLen = read(0, inBuf, sizeof(inBuf)); inPos = 0; if (inLen <= 0) return -1; } return inBuf[inPos++]; } inline int readInt() { int c = readChar(); while (c <= ' ') { if (c == -1) return -1; c = readChar(); } int x = 0; while (c > ' ') { x = x * 10 + (c - '0'); c = readChar(); } return x; } static int a[305], b[305]; int main() { int T = readInt(); while (T--) { int n = readInt(); for (int i = 0; i < n; i++) a[i] = readInt(); }

#include <bits/stdc++.h> using namespace std; int main() { int T; cin >> T; while(T--) { int n; cin >> n; vector<int> b(n); for(int i = 0; i < n; i++) { cin >> b[i]; } vector<int> a; int l = 0, r = n - 1; for(int i = 1; i <= n; i) { if(i % 2 == 1) { // 原a奇数项：拿左边 a.push_back(b[l]); } else { // 原a偶数项：拿右边 a.push_back(b[r--]); } } // 输出答案 for(int i = 0; i < a.size(); i++) { if(i > 0) cout << " "; cout << a[i]; } cout << endl; } return 0; }