Submission #12689

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
12689	2014-12-30 07:33:46	gs14004	Min-cost GCD (GA9_mcg)	C++98	100 / 100	528 ms	1084 KiB

mcg

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#include <cstdio>
#include <algorithm>
#include <cstring>
using namespace std;
 
typedef long long lint;
lint dp[100], dp2[100];
lint pow[19] = {1,0}; 
lint a,b,p,q;
inline bool calc_valid(lint x, lint y){
    int t = lower_bound(pow,pow+19,x) - pow + lower_bound(pow,pow+19,y) - pow;
    return t < 18;
}
 
lint f(lint x, lint y, int step){
    if(x == 0 || y == 0) return 0;
    if(x >= y){
        if(~dp[step]) return dp[step];
        if(!calc_valid(q,x/y)) return dp[step] = f(y,x%y,step+1) + p;
        else return dp[step] = min(f(y,x%y,step+1) + p,f(x%y,y,step+1) + q*(x/y));
    }
    else{
        if(~dp2[step]) return dp2[step];
        if(!calc_valid(q,y/x)) return 5e18;
        else return dp2[step] = f(x,y%x,step+1) + q * (y/x);
    }
}
 
void solve(){
 
 
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• Subtask 1: 14 / 14
• Subtask 2: 16 / 16
• Subtask 3: 27 / 27
• Subtask 4: 43 / 43