快速输入[模板]

Posted 2021-03-02 leader-one

#include<iostream>
#include<cstdio>
#include<ctime>
using namespace std;
int a[1005][1005];
inline int read(){//非常重要的快速读入代码
int x=0,sign=1;
char c=getchar();
while(c>‘9‘||c<‘0‘){//判断符号
if(c==‘-‘) sign=-1;
c=getchar();
}
while(c>=‘0‘&&c<=‘9‘){//转换数
x=x*10+c-‘0‘;
c=getchar();
}
return x*sign;
}
int main(){
freopen("out1.txt","r",stdin);
double s=clock();
for(int i=1;i<=1000;i++){
for(int j=1;j<=1000;j++){
a[i][j]=read();
}
}
printf("time used=%.3fs ",double(clock()-s)/CLOCKS_PER_SEC);
}

 

 

#include<iostream>
#include<cstdio>
#include<ctime>
using namespace std;
int a[1005][1005];
int main(){
freopen("out1.txt","r",stdin);
double s=clock();
for(int i=1;i<=1000;i++){
for(int j=1;j<=1000;j++){
scanf("%d",&a[i][j]);
}
}
printf("time used=%.3fs ",double(clock()-s)/CLOCKS_PER_SEC);
}