Used to judge the time-consuming printing of a program
#include <chrono>
int main(){
auto start = std::chrono::steady_clock::now();
int res=countNonZero(s,srcBase,s.width); //do some things
auto end = std::chrono::steady_clock::now();
auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(end-start);
double time = ms.count();
std::cout<<"res:"<<res<<","<<time<<std::endl;
}