蓝桥杯 小沸的疯狂实验

代码

#include<bits/stdc++.h>
using namespace std;
#define int long long int

inline int read() {
    int ans = 0, f = 1;
    char ch = getchar();
    while (ch < '0' || ch > '9') {
        if (ch == '-')f = -1;
        ch = getchar();
    }
    while (ch <= '9' && ch >= '0') {
        ans = ans * 10 + ch - '0';
        ch = getchar();
    }
    return ans * f;
}
void solve() {
    int ans = 0;
    int a=read(),b=read(),c=read(),d=read();
    for (int i = a; i<= b; i++) {
        if (i < c) {
            ans += d-c + 1;
        }
        else if (i >=c && i < d) {
            ans += d- i;
        }
    }
    cout<<ans<<"\n";
}
signed main() {
    int t=read();
    while (t--) solve();
    return 0;
}