Codeforces Beta Round #4 (Div. 2 Only) B. Before an Exam

继续刷水题,不能再错了!!

题目大意:

要求在n天内学习t小时,给出每一天可以学习的最小时间和最大时间。问能不能实现,若可以输出时间表。

解题思路:

水题一个,保证在区间范围内的情况下直接贪心。

下面是代码:

#include <set>
#include <map>
#include <queue>
#include <math.h>
#include <vector>
#include <string>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <iostream>
#include <cctype>
#include <algorithm>

#define eps 1e-10
#define pi acos(-1.0)
#define inf 107374182
#define inf64 1152921504606846976
#define lc l,m,tr<<1
#define rc m + 1,r,tr<<1|1
#define zero(a) fabs(a)<eps
#define iabs(x)  ((x) > 0 ? (x) : -(x))
#define clear1(A, X, SIZE) memset(A, X, sizeof(A[0]) * (min(SIZE,sizeof(A))))
#define clearall(A, X) memset(A, X, sizeof(A))
#define memcopy1(A , X, SIZE) memcpy(A , X ,sizeof(X[0])*(SIZE))
#define memcopyall(A, X) memcpy(A , X ,sizeof(X))
#define max( x, y )  ( ((x) > (y)) ? (x) : (y) )
#define min( x, y )  ( ((x) < (y)) ? (x) : (y) )

using namespace std;

struct node
{
    int min1,max1;
}da[35];

int main()
{
    int d,t,uplim=0,downlim=0;
    scanf("%d%d",&d,&t);
    for(int i=0;i<d;i++)
    {
        scanf("%d%d",&da[i].min1,&da[i].max1);
        downlim+=da[i].min1;
        uplim+=da[i].max1;
    }
    if(uplim<t||downlim>t)
    {
        puts("NO");
    }
    else
    {
        puts("YES");
        t-=downlim;
        for(int i=0;i<d;i++)
        {
            if(t>=da[i].max1-da[i].min1)
            {
                printf("%d ",da[i].max1);
                t-=da[i].max1-da[i].min1;
            }
            else if(t==0)
            {
                printf("%d ",da[i].min1);
            }
            else if(t<da[i].max1-da[i].min1)
            {
                printf("%d ",t+da[i].min1);
                t=0;
            }
        }
    }
    return 0;
}
时间: 2024-08-29 20:58:58

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