# Csu1584:train passengers

Source: Internet
Author: User

Description

Input

Output

Sample Input
`1 20 1 11 0 0`
Sample Output
`Possible`
`Test instructions: Give train capacity C, number of sites n`
`For each site give the number of passengers, get off the number and waiting for the number`
`Ask if you can finish the journey on request`
`Idea: This problem has been understood for quite a long time, and was later determined as follows`
`1. The last stop, after the calculation, must be no one in the car, nobody on the bus, no one waiting`
`2. Beyond the capacity of the vehicle, must not`
`3. If the car is not full, but there are waiting for the person, then it is not possible, because the car is not full I why not on Ah, still waiting for the yarn`
`#include <iostream> #include <stdio.h> #include <string.h> #include <stack> #include <queue > #include <map> #include <set> #include <vector> #include <math.h> #include <algorithm >using namespace std, #define LS 2*i#define rs 2*i+1#define up (i,x,y) for (i=x;i<=y;i++) #define DOWN (i,x,y) for (i=x; i>=y;i--) #define MEM (a,x) memset (A,x,sizeof (a)) #define W (a) while (a) #define LL long longconst double pi = acos (-1.0); #    Define Len 200005#define mod 360000const int INF = 0x3f3f3f3f; #define EXP 1e-6int Main () {LL c,n,sum,w,a,b,c;        W (scanf ("%lld%lld", &c,&n) >0) {sum=0;        w=0;        int flag=0;            W (n--) {scanf ("%lld%lld%lld", &a,&b,&c);            if (flag) continue;                if (sum<a) {flag=1;            Continue            } sum=sum-a+b;            if (sum>c) flag=1; if (sum!=c && C)flag = 1;        if (!n && (sum | | b | | c)) flag = 1;        } if (flag) printf ("impossible\n");    else printf ("possible\n"); }}`

Csu1584:train passengers

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