{"id":4930,"date":"2022-08-25T05:22:47","date_gmt":"2022-08-24T23:52:47","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-c-unable-to-read-from-large-txt-file-closed\/"},"modified":"2022-08-25T05:22:47","modified_gmt":"2022-08-24T23:52:47","slug":"solved-c-unable-to-read-from-large-txt-file-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-c-unable-to-read-from-large-txt-file-closed\/","title":{"rendered":"[Solved] C++ : Unable to read from large txt file [closed]"},"content":{"rendered":"

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Your problem is in the merge function:<\/p>\n

you exceed the local variable c.<\/p>\n

long c[30];<\/code><\/p>\n

maybe there are more problems, that is the first I notice.<\/p>\n

EDIT<\/h1>\n

Try this: find the differences…<\/p>\n

#include <map>\n#include <vector>\n#include <fstream> \n#include <iostream> \n#include <time.h>\nusing namespace std;\n\nvoid merge(vector<long> &,long ,long , long );\n\n\nvoid divide(vector<long> &arr,long min, long max){\n    long mid;\n\n    if(min<max){\n        mid=(min+max)\/2;\n        if(min != mid) divide(arr,min,mid);\n        if(max != mid+1) divide(arr,mid+1,max);\n        merge(arr,min,mid,max);\n    }\n    return;\n\n}\n\nvoid merge(vector<long> &arr,long min, long mid,long max){\n    long i,j,k;\n    map<long,long> c; \/\/uses map because the vector not always start from 0\n    \/\/other option is to use vector<long> c(max-min) and substruct min when copy to\/from it.\n    \/\/like this: vector<long> c(1+max-min); \/\/initialize size = max-min+1\n    \/\/           c[k-min] = arr[i];\n    \/\/           arr[i] = c[i-min];\n    i=min,j=mid+1;\n    k=min;\n\n    while(i<=mid && j<=max){\n        if(arr[i]<arr[j]){\n            c[k]=arr[i];\n            i++;\n            k++;\n        }\n        else{\n            c[k]=arr[j];\n            j++;\n            k++;\n        }\n    }\n    while(i<=mid){\n        c[k]=arr[i];\n        i++;\n        k++;\n    }\n    while(j<=max){\n        c[k]=arr[j];\n        j++;\n        k++;\n    }\n\n    for(long i=min;i<=max;i++)\n        arr[i]=c[i];\n}\n\nvoid create_input(int i){\n    srand(time(NULL));\n    ofstream fout(\"sample2.txt\");\n    while(i--){\n        fout<<rand()<<\" \";\n    }\n} \n\nint main(){\n\n    vector<long> data;\n    long tmp;\n    long count=0;\n    \/\/create random input\n    \/\/create_input(31);\n\n    ifstream fin(\"sample2.txt\");\n\n    while(fin >> tmp)\n    {\n        data.push_back(tmp);\n        count++;\/\/count = data.size(); !!\n    }\n    cout<<\"the unsorted array is\\n\";\n    for(long i=0;i<count;i++)\n        cout<<i<<\"]\\t\"<<data[i]<<\"\\n\";\n\n    divide(data,0,count-1);\/\/use last index not size\n\n    cout<<\"the sorted array is\\n\";\n    for(long i=0;i<count;i++)\n        cout<<i<<\"]\\t\"<<data[i]<<\"\\n\";\n\n\n    return 0;\n}\n<\/code><\/pre>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            4<\/span> <\/p><\/div>\n<\/div>\n
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solved C++ : Unable to read from large txt file [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Your problem is in the merge function: you exceed the local variable c. long c[30]; maybe there are more problems, that is the first I notice. EDIT Try this: find the differences… #include <map> #include <vector> #include <fstream> #include <iostream> #include <time.h> using namespace std; void merge(vector<long> &,long ,long , long ); void divide(vector<long> … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,1148,1158,806],"class_list":["post-4930","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-input","tag-mergesort","tag-vector"],"yoast_head":"\n[Solved] C++ : Unable to read from large txt file [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-c-unable-to-read-from-large-txt-file-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] C++ : Unable to read from large txt file [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Your problem is in the merge function: you exceed the local variable c. long c[30]; maybe there are more problems, that is the first I notice. EDIT Try this: find the differences… #include <map> #include <vector> #include <fstream> #include <iostream> #include <time.h> using namespace std; void merge(vector<long> &,long ,long , long ); void divide(vector<long> ... 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EDIT Try this: find the differences… #include <map> #include <vector> #include <fstream> #include <iostream> #include <time.h> using namespace std; void merge(vector<long> &,long ,long , long ); void divide(vector<long> ... 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