c++ - How to insert values in STL map within a loop -


i wanted know how 1 can insert values in map within loop. had used insert() in following code did not worked.

#include<stdio.h> #include<map> #include<utility> using namespace std; int main() {     int t;     scanf("%d", &t);     while (t--)     {         int n, i;         map<char*, int> vote;         char name[20], v;         scanf("%d", &n);         (i = 0; i<n; ++i)         {             scanf("%s %c", name, &v);             vote.insert(make_pair(name, 0));              vote[name] = 0;             if (v == '+')                 vote[name]++;             else                 vote[name]--;             printf("%d\n", vote[name]);             printf("size=%lu\n", vote.size());         }         int score = 0;         (map<char*, int>::iterator = vote.begin(); != vote.end(); ++it)         {             printf("%s%d\n", it->first, it->second);             score += it->second;         }         printf("%d\n", score);      } }

everytime type new key(string) updates previous one. size of map 1.

how correctly add new element map?

the map keyed pointer (char*). key in code same 1 - name pointer (although change content pointer points on, not change fact pointer not same).

you can use std::string key instead of char*.

changing definition of map (replace char* in std::string) fix problem.

edit: @mcnabb said, change it->first it->first.c_str().


Comments

Post a Comment

Popular posts from this blog

javascript - Google App Script ContentService downloadAsFile not working -

i have web app developed using google app script htmlservice , html form, populating excel sheet in google drive using spreadsheetapp . , 1 section calling contentservice download data excel file. function doget(e) { // read excel sheet //getappfile(); // render application html template return htmlservice.createtemplatefromfile('index').evaluate() .settitle('go smart') .setsandboxmode(htmlservice.sandboxmode.iframe); } function downloaddoublequatecsvfile() { var sheetid = propertiesservice.getscriptproperties().getproperty('sheetid'); var ss = spreadsheetapp.openbyid(sheetid).getactivesheet(); //var ss = spreadsheetapp.getactivespreadsheet().getactivesheet(); var maxcolumn = ss.getlastcolumn(); var maxrow = ss.getlastrow(); var data = ss.getrange(1, 1, maxrow, maxcolumn).getvalues(); if (data.length > 1) { var csv = ""; (var row = 0; row < data.length; row++) { (var c...
Read more

javascript - Function overwritting -

is there way overwrite function or event handling in function? using addeventlistener, can have many event handlers on element want var test=document.getelementbyid("div"); test.addeventlistener("click",function(){alert("im first");},false); test.addeventlistener("click",function(){alert("im second");},false); // alerts "im first" , after "im second" but if want overwrite function/event example based on client width example this function one() { alert("first"); } function two() { alert("second"); } window.onresize = function() { var test = document.getelementbyid("div"); if (window.innerwidth > 500) { test.onclick = 1 } else { test.onclick = two; } } is possible in javascript? in case use effective little known approach. addeventlistener can accept object property handleevent event handler. in case it's easy overwr...
Read more

c# - Exception when attempting to modify Dictionary -

i creating dictionary manage threads , ran exception when attempt clear dead threads after adding threads dictionary. using system; using system.collections.generic; using system.threading; namespace syscat { public class threadmanager { public static readonly threadmanager globalthreadmanager = new threadmanager( ); /// <summary> /// initializes new instance of <see cref="syscat.threadmanager"/> class. /// </summary> public threadmanager( ) { } /// <summary> /// create new threadmanager threads within basetm , deinitializes basetm /// </summary> public threadmanager( threadmanager basetm ) { this.threads = basetm.threads; basetm.threads.clear( ); } private dictionary<guid,thread> threads = new dictionary<guid, thread>( ); /// <summary> /// attempts obtain unused threadid within ...
Read more