Submission #127370

#	Time	Username	Problem	Language	Result	Execution time	Memory
127370		roseanne_pcy	Popeala (CEOI16_popeala)	C++14	100 / 100	367 ms	16652 KiB

popeala

#include <bits/stdc++.h>
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
using namespace std;
#define X first
#define Y second
#define pb push_back
typedef pair<int, int> ii;
typedef long long ll;

const int maxt = 2e4+5;
const int maxn = 55;

ll pts[maxt];

char foo[maxn][maxt];

int n, t, s;

vector<int> lims[maxt];
ll mem[maxt];
ll dp[maxn][maxt];

void clear()
{
	for(int i = 0; i<= n; i++) mem[i] = 1e18+5;
}
int main()
{
	scanf("%d %d %d", &n, &t, &s);
	for(int i = 1; i<= t; i++)
	{
		scanf("%lld", &pts[i]);
		pts[i] += pts[i-1];
	}
	for(int i = 1; i<= n; i++)
	{
		scanf("%s", foo[i]+1);
	}
	for(int i = 1; i<= n; i++)
	{
		int last = 0;
		for(int j = 1; j<= t; j++)
		{
			if(foo[i][j] == '1')
			{
				lims[j].pb(last);
			}
			else
			{
				lims[j].pb(j);
				last = j; 
			}
		}
	}
	for(int i = 1; i<= t; i++)
	{
		lims[i].pb(i);
		sort(lims[i].begin(), lims[i].end());
	}
	for(int i = 0; i<= s; i++)
	{
		for(int j = 0; j<= t; j++)
		{
			dp[i][j] = 1e18;
		}
	}
	dp[0][0] = 0;
	for(int i = 1; i<= s; i++)
	{
		clear();
		for(int j = 1; j<= t; j++)
		{
			// printf("computing %d\n", j);
			for(int k = 0; k<= n; k++)
			{
				for(int run = j>1?lims[j-1][k]:0; run< lims[j][k]; run++)
				{
					mem[k] = min(mem[k], dp[i-1][run]-pts[run]*k);
					// if(k == 0) printf("cand2 %d-%d\n", dp[i-1][run], pts[run]*k);
				}
				// printf("[%d..%d), %d\n", j>1?lims[j-1][k]:0, lims[j][k], mem[k]);
				if(lims[j][k]> 0) dp[i][j] = min(dp[i][j], mem[k]+k*pts[j]);
				// printf("cand %d\n", mem[k]+k*pts[j]);
			}
			// printf("dp[%d][%d] = %d\n", i, j, dp[i][j]);
		}
		printf("%lld\n", dp[i][t]);
	}
}

Compilation message (stderr)

popeala.cpp: In function 'int main()':
popeala.cpp:30:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d", &n, &t, &s);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
popeala.cpp:33:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld", &pts[i]);
   ~~~~~^~~~~~~~~~~~~~~~~
popeala.cpp:38:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s", foo[i]+1);
   ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 74 / 74