Code used

package main

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
    "net/http"
    "sort"
)

type Team struct {
    Name      string `json:"name"`
    Institute string `json:"institution"`
}

func main() {
    // create a new HTTP client
    client := &http.Client{}

    // create a new GET request
    req, err := http.NewRequest("GET", "https://icpc.global/api/team/search/site/accepted/22697?q=proj:institution,name%3B&page=1&size=1250", nil)
    if err != nil {
        fmt.Println("Error creating request:", err)
        return
    }

    // execute the request
    resp, err := client.Do(req)
    if err != nil {
        fmt.Println("Error sending request:", err)
        return
    }

    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        fmt.Println("Error reading response body:", err)
        return
    }

    var teams []Team
    err = json.Unmarshal(body, &teams)
    if err != nil {
        fmt.Println("Error parsing response body as JSON:", err)
        return
    }

    distinctCollege := make(map[string]int)

    for i := 0; i < len(teams); i++ {
        distinctCollege[teams[i].Institute]++
    }

    keys := make([]string, 0, len(distinctCollege))

    for k := range distinctCollege {
        keys = append(keys, k)
    }
    sort.SliceStable(keys, func(i, j int) bool {
        return distinctCollege[keys[i]] > distinctCollege[keys[j]]
    })

    for _, k := range keys {
        fmt.Println(k, distinctCollege[k])
    }
}