Submission #311606

#	Time	Username	Problem	Language	Result	Execution time	Memory
311606		milisav	Packing Biscuits (IOI20_biscuits)	C++14	100 / 100	20 ms	896 KiB

biscuits

#include<bits/stdc++.h>
#include "biscuits.h"
using namespace std;

long long count_tastiness(long long x, std::vector<long long> a) {
    long long t[70];
    long long psum[70];
    long long deg[70];
    int k=60;
    while(a.size()<k) a.push_back(0);
    for(long long i=0;i<k;i++) {
        t[i]=0;
        psum[i]=0;
        deg[i]=(1ll<<i);
    }
    psum[0]=a[0];
    for(int i=1;i<k;i++) psum[i]=psum[i-1]+a[i]*deg[i];
    int mk=0;
    long long ts=psum[k-1];
    for(int i=0;i<k;i++) {
        if(ts/x<deg[i]) {
            t[i]=((i==0) ? 1 : t[i-1]);
            continue;
        }
        if(i==0) {
            if(a[i]>=x) t[i]=2;
            else t[i]=1;
        }
        else {
            if(a[i]>=x) t[i]=2*t[i-1];
            else {
                long long nec=(x-a[i])*deg[i];
                long long tot=0;
                for(int j=i-1;j>=0;j--) {
                    long long bd=min((psum[j]-nec)/x,deg[j+1]-1);
                    if(bd>=deg[j]) {
                        tot+=(j==0 ? 1 : t[j-1]);
                        nec=max(nec+(x-a[j])*deg[j],0ll);
                    }
                    else nec=max(nec-deg[j]*a[j],0ll);
                }
                t[i]=t[i-1]+tot+(nec==0);
            }
        }
    }
	return t[k-1];
}



/*int main() {
	int q;
	assert(scanf("%d", &q) == 1);
	vector<int> k(q);
	vector<long long> x(q);
	vector<vector<long long>> a(q);
	vector<long long> results(q);
	for (int t = 0; t < q; t++) {
		assert(scanf("%d%lld", &k[t], &x[t]) == 2);
		a[t] = vector<long long>(k[t]);
		for (int i = 0; i < k[t]; i++) {
			assert(scanf("%lld", &a[t][i]) == 1);
		}
	}
	fclose(stdin);

	for (int t = 0; t < q; t++) {
		results[t] = count_tastiness(x[t], a[t]);
	}
	for (int t = 0; t < q; t++) {
		printf("%lld\n", results[t]);
	}
	fclose(stdout);
	return 0;
}*/

Compilation message (stderr)

biscuits.cpp: In function 'long long int count_tastiness(long long int, std::vector<long long int>)':
biscuits.cpp:10:19: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   10 |     while(a.size()<k) a.push_back(0);
      |           ~~~~~~~~^~
biscuits.cpp:18:9: warning: unused variable 'mk' [-Wunused-variable]
   18 |     int mk=0;
      |         ^~

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 21 / 21
• Subtask 4: 35 / 35
• Subtask 5: 23 / 23