제출 #120216

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
120216		errorgorn	JOIOJI (JOI14_joioji)	C++14	컴파일 에러	0 ms	0 KiB

joioji

    #include <cstdio>
    #include <unordered_map>
    #include <utility>
    #include <string>
    #include <iostream>
    #include <cstring>
    #include <algorithm>
    using namespace std;
    typedef pair<int,int> ii;
    int n;
    char c;
    string s;
    struct custom_hash{
        size_t operator()(const pair<int,int> &i)const{
            return hash<long long>()(((long long)x.first)^(((long long)x.second)<<32));
        }
    };
    unordered_map<ii,int,custom_hash> suffix;
    int arr[3];
    int pre[3];
    int main(){
        suffix.reserve(4096);
        suffix.max_load_factor(0.25);
        //freopen("input.txt","r",stdin);
        scanf("%d",&n);
        getchar();
        c=getchar();
        while (c!='\n'){
            s+=c;
            if (c=='J') arr[0]++;
            else if (c=='O') arr[1]++;
            else arr[2]++;
            c=getchar();
        }
        suffix[ii(0,0)]=0;
        for (int x=0;x<3;x++) pre[x]=arr[x];
        for (int x=0;x<s.size();x++){
            if (s[x]=='J') pre[0]--;
            else if (s[x]=='O') pre[1]--;
            else pre[2]--;
            suffix[ii(pre[0]-pre[1],pre[0]-pre[2])]=x+1;
        }
        memset(pre,0,sizeof(pre));
        int ans=0;
        int a=arr[0]-arr[1],b=arr[0]-arr[2];
        for (int x=0;x<s.size();x++){
            ans=max(ans,suffix[ii(a-(pre[0]-pre[1]),b-(pre[0]-pre[2]))]-x);
            if (s[x]=='J') pre[0]++;
            else if (s[x]=='O') pre[1]++;
            else pre[2]++;
        }
        printf("%d\n",ans);
    }

컴파일 시 표준 에러 (stderr) 메시지

joioji.cpp: In member function 'size_t custom_hash::operator()(const std::pair<int, int>&) const':
joioji.cpp:15:50: error: 'x' was not declared in this scope
             return hash<long long>()(((long long)x.first)^(((long long)x.second)<<32));
                                                  ^
joioji.cpp: In function 'int main()':
joioji.cpp:37:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int x=0;x<s.size();x++){
                      ~^~~~~~~~~
joioji.cpp:46:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int x=0;x<s.size();x++){
                      ~^~~~~~~~~
joioji.cpp:25:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&n);
         ~~~~~^~~~~~~~~