W3School TIY Editor

#include <iostream> #include <ctime> using namespace std; int main() { clock_t before = clock(); int k = 0; for (int i = 0; i < 100000; i++) { k += i; } clock_t duration = clock() - before; cout << "耗时: " << (float)duration / CLOCKS_PER_SEC << " 秒"; return 0; }