#include <algorithm>
#include <iostream>
#include <stdio.h>
#include <string.h>
#define usi unsigned long
using namespace std;

int main() {
    printf("%lu %lu %lu %lu %lu %lu", sizeof(int), sizeof(unsigned int), sizeof(long), sizeof(usi), sizeof(long long), sizeof(usi long));
    return 0;
}

结果：

4 4 8 8 8 8

long和long long空间一样??(洛谷IDE,c++14GCC9,O2)(颠覆认知)