讨论详情 - Hydro

问答
实验2 拓展题完美排列文件Solution.h 报错
U202411512 LV 6 @ 2025-10-4 16:05:15

自测时报错： In file included from foo.cc:1: Solution.h: In lambda function: Solution.h:57:21: warning: comparison of integer expressions of different signedness: 'std::vector::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 57 | if(A.size() != n) { | ~~~~~~~^~ 可见引用文件Solution.h中出现了语法错误，麻烦老师修改一下

webliu SU @ 2025-10-17 17:16:11
已修改
报错信息显示 long unsigned int和int类型不匹配 A.size()返回的数据类型是size_t,为无符号整数类型,int为有符号整数类型,比较时可能会出现bug,请同学们注意

感兴趣的话可以运行如下代码
```
#include<iostream>
using namespace std;
int main(){
  size_t a = 20000;
  int b = -1;
  if(a > b)
    cout << "20000 > -1" << endl;
  else
    cout << "20000 <= -1" << endl;
  return 0;
}
```
并思考运行结果