OJ-Problems-Source/HDOJ/3433_autoAC.cpp

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#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
int dp[55][205], a[205], b[205];
int _, n, x, y, kase = 0;
bool check(int t)
{
memset(dp, -1, sizeof(dp));
dp[0][0] = 0;
for(int i = 1; i <= n; ++i)
{
if(dp[i][x] >= y) return true;
for(int j = 0; j <= x; ++j)
{
if(dp[i - 1][j] != -1)
{
int temp = min(t/a[i], x-j);
for(int k = 0; k <= temp; ++k)
{
int t1 = (t - a[i] * k) / b[i];
dp[i][j + k] = max(dp[i][j + k], dp[i - 1][j] + t1);
}
}
}
}
if(dp[n][x] >= y) return true;
return false;
}
int main(void)
{
scanf("%d", &_);
while(_--)
{
scanf("%d%d%d", &n, &x, &y);
for(int i = 1; i <= n; ++i)
scanf("%d%d", &a[i], &b[i]);
int l = 0, r = a[1] * x + b[1] * y;
int ans = r;
while(l <= r)
{
int mid = (l + r) >> 1;
if(check(mid))
{
ans = mid;
r = mid - 1;
}
else l = mid + 1;
}
printf("Case %d: %d\n", ++kase, ans);
}
return 0;
}