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| #include<iostream>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<algorithm>
using namespace std;
#define REP(i,e,s) for(register int i=e; i<=s; i++)
#define DREP(i,e,s) for(register int i=e; i>=s; i--)
#define ll long long
#define DE(...) fprintf(stderr,__VA_ARGS__)
#define DEBUG(a) DE("DEBUG: %d\n",a)
#define file(a) freopen(a".in","r",stdin);freopen(a".out","w",stdout)
int read() {
int x=0,f=1,ch=getchar();
while(ch>'9'||ch<'0'){if(ch=='-')f=-1;ch=getchar();}
while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
return x*f;
}
const int MAXN=5e5+10,INF=0x3f3f3f;
int x[MAXN],low[MAXN],up[MAXN];
int main() {
int n=read(),X=read();
REP(i,1,n) x[i]=read(),low[i]=read(),up[i]=read();
int a=0,b=0;
REP(i,1,n) {
a=min(a+(x[i]-x[i-1]),up[i]-1);
b=max(b-(x[i]-x[i-1]),low[i]+1);
if((a&1)!=(x[i]&1)) a--;
if((b&1)!=(x[i]&1)) b++;
if(a<b) {
puts("NIE");
return 0;
}
}
printf("%d\n",(x[n]+b)/2);
return 0;
}
|
