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#define pii pair<ui, ui>
#define ui unsigned int
void lfu(int frame) {
    int hit = 0, miss = 0, size = 0;
    ui in;
    unordered_map<ui, ui> page;
    set<pii> pool;
 
    while(in1 >> in) {
        //find
        if(page.count(in)) {
            hit++;
            pool.erase(make_pair(page[in]++, in));
            pool.emplace(make_pair(page[in], in));
        }
        //miss
        else {
            miss++;
            //full
            if(size == frame) {
 
                size--;                
                page.erase((*pool.begin()).second);                
                pool.erase(pool.begin());
 
            }
            pool.emplace(make_pair(1, in));
            page[in] = 1;
 
            size++;
        }
    }
    double rate = double(miss) / (hit + miss);
    printf("%d\t%d\t\t%d\t\t%.10f\n", frame, hit, miss, rate);
}

Main.java:1: error: illegal character: '#'
#define pii pair<ui, ui>
^
Main.java:1: error: class, interface, or enum expected
#define pii pair<ui, ui>
        ^
Main.java:2: error: illegal character: '#'
#define ui unsigned int
^
Main.java:5: error: class, interface, or enum expected
    ui in;
    ^
Main.java:6: error: class, interface, or enum expected
    unordered_map<ui, ui> page;
    ^
Main.java:7: error: class, interface, or enum expected
    set<pii> pool;
    ^
Main.java:9: error: class, interface, or enum expected
    while(in1 >> in) {
    ^
Main.java:13: error: class, interface, or enum expected
            pool.erase(make_pair(page[in]++, in));
            ^
Main.java:14: error: class, interface, or enum expected
            pool.emplace(make_pair(page[in], in));
            ^
Main.java:15: error: class, interface, or enum expected
        }
        ^
Main.java:20: error: class, interface, or enum expected
            if(size == frame) {
            ^
Main.java:23: error: class, interface, or enum expected
                page.erase((*pool.begin()).second);                
                ^
Main.java:24: error: class, interface, or enum expected
                pool.erase(pool.begin());
                ^
Main.java:26: error: class, interface, or enum expected
            }
            ^
Main.java:28: error: class, interface, or enum expected
            page[in] = 1;
            ^
Main.java:30: error: class, interface, or enum expected
            size++;
            ^
Main.java:31: error: class, interface, or enum expected
        }
        ^
Main.java:34: error: class, interface, or enum expected
    printf("%d\t%d\t\t%d\t\t%.10f\n", frame, hit, miss, rate);
    ^
Main.java:35: error: class, interface, or enum expected
}
^
19 errors

Standard output is empty