oj.uz

Submission #167012

# Submission time Handle Problem Language Result Execution time Memory
167012 2019-12-05T08:41:44 Z errorgorn JOIOJI (JOI14_joioji) C++14
20 / 100
 1000 ms 6404 KB 
#include <cstdio>
#include <unordered_map>
#include <utility>
#include <string>
#include <iostream>
#include <cstring>
#include <algorithm>
#include <chrono>
using namespace std;
typedef pair<int,int> ii;
int n;
char c;
string s;
struct custom_hash {
    typedef unsigned long long ull;
    const ull FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
    static ull splitmix64(ull x) {
        // http://xorshift.di.unimi.it/splitmix64.c
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(ull x) const {
        return splitmix64(x + FIXED_RANDOM);
    }
    size_t operator()(const pair<int,int> &i)const{
        return splitmix64((((ull)i.first)|(((ull)i.second)<<32))+FIXED_RANDOM);
    }
};
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);
}

Compilation message

joioji.cpp: In function 'int main()':
joioji.cpp:51:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int x=0;x<s.size();x++){
                  ~^~~~~~~~~
joioji.cpp:60:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int x=0;x<s.size();x++){
                  ~^~~~~~~~~
joioji.cpp:39:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 380 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 3 ms 376 KB Output is correct
4 Correct 3 ms 504 KB Output is correct
5 Correct 3 ms 504 KB Output is correct
6 Correct 4 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 3 ms 504 KB Output is correct
9 Correct 8 ms 504 KB Output is correct
10 Correct 3 ms 504 KB Output is correct

Subtask #3
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 632 KB Output is correct
2 Correct 21 ms 1644 KB Output is correct
3 Correct 20 ms 1724 KB Output is correct
4 Correct 86 ms 3024 KB Output is correct
5 Correct 122 ms 5796 KB Output is correct
6 Correct 73 ms 5924 KB Output is correct
7 Correct 94 ms 5924 KB Output is correct
8 Correct 371 ms 6048 KB Output is correct
9 Correct 44 ms 5924 KB Output is correct
10 Correct 45 ms 6048 KB Output is correct
11 Correct 43 ms 6404 KB Output is correct
12 Execution timed out 1068 ms 3424 KB Time limit exceeded
13 Halted 0 ms 0 KB -