# CSU1584: Train Passengers, csu1584passengers

Source: Internet
Author: User

CSU1584: Train Passengers, csu1584passengers
Description

Input

Output

Sample Input
`1 20 1 11 0 0`
Sample Output
`possible`

`Question: Train capacity c, number of sites n`
`The number of people on the bus, the number of people on the bus, and the number of waiting persons are provided for each site.`
`Finally, I asked if I could complete the journey as required.`

`Train of Thought: I have understood this question for a long time, and I will be determined as follows:`
`1. After the calculation, no one on the bus, no one on the bus, no one waiting`
`2. exceeding the capacity of the vehicle will inevitably fail`
`3. If the car is not fully loaded, but there are still waiting persons, then it will not work, because the car is not fully loaded. Why can't I do it? Wait for wool?`

`#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");    }}`

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