__int64 与long long 的区别 杭电 2044

有人进行了总结：http://blog.csdn.net/shiwei408/article/details/7463476
这是编译有警告：

#include<stdio.h>int main(){    long long a[51]={0};    int n,i;    scanf("%d",&n);    a[1] = 1;    a[2] = 2;    for(i = 3;i < 51; i++)        a[i] = a[i-1] + a[i-2];    while(n--)    {        int x1,x2;        scanf("%d%d",&x1,&x2);        printf("%lld\n",a[x2-x1]);    }    return 0;}

编译无警告：

#include<stdio.h>#include<iostream>using namespace std;int main(){    long long  a[51]={0};    int n,i;    scanf("%d",&n);    a[1] = 1;    a[2] = 2;    for(i = 3;i < 51; i++)        a[i] = a[i-1] + a[i-2];    while(n--)    {        int x1,x2;        scanf("%d%d",&x1,&x2);        cout<<a[x2-x1]<<endl;    }    return 0;}