Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func main() {

	sc := bufio.NewScanner(os.Stdin)
	sc.Scan()
	args := strings.Split(sc.Text(), " ")
	n, _ := strconv.Atoi(args[0])
	t, _ := strconv.ParseInt(args[1], 10, 64)

	q, _ := strconv.Atoi(args[2])

	pos := make([]int64, n)
	direction := make([]bool, n)

	for i := 0; i < n; i++ {
		sc.Scan()
		args = strings.Split(sc.Text(), " ")

		pos[i], _ = strconv.ParseInt(args[0], 10, 64)
		q, _ := strconv.Atoi(args[1])
		if q == 1 {
			direction[i] = true
		}
	}

	qq := make([]int, q)
	for i := 0; i < q; i++ {
		sc.Scan()
		args = strings.Split(sc.Text(), " ")

		qq[i], _ = strconv.Atoi(args[0])
	}

	ans(n, q, t, pos, direction, qq)

}

func ans(n, q int, t int64, pos []int64, dir []bool, qq []int) {

	colleation := []int64{} // syoutotu positon

	for i := 1; i < n; i++ {
		if dir[i-1] == dir[i] {
			continue
		}
		colleation = append(colleation, (pos[i-1]+pos[i])/2)

	}
	//fmt.Println(colleation)
	for i := 0; i < q; i++ {
		var ans int64
		ans = int64(-9999999)
		if dir[qq[i]-1] == true {
			// 東向きなら現ポジから＋方向で一番近い衝突点との距離を求めて、Tとの差が
			for _, v := range colleation {
				if v <= pos[qq[i]-1] {
					continue
				} else {
					// 衝突予定点が確定。衝突点との距離がT以下なら衝突点で停止
					if v-pos[qq[i]-1] <= t {
						ans = v
					} else {
						ans = pos[qq[i]-1] + int64(t)
					}
					break
				}
			}
			if ans == -9999999 {
				ans = pos[qq[i]-1] + int64((t))
			}

		} else {
			// nishi向きなら現ポジから-方向で一番近い衝突点との距離を求めて、Tとの差が
			for j := len(colleation); j > 0; j-- {
				if colleation[j-1] >= pos[qq[i]-1] {
					continue
				}
				v := colleation[j-1]
				//fmt.Printf("hoge=%d\n", v)
				// 衝突予定点が確定
				if pos[qq[i]-1]-v <= t {
					ans = v
				} else {
					ans = pos[qq[i]-1] - int64((t))
				}
				break

			}
			if ans == -9999999 {
				ans = pos[qq[i]-1] - int64((t))
			}

		}
		fmt.Printf("%d\n", ans)

	}

}

C++: #include <iostream>
using namespace std;
#define M 100000


int n,t,q;
int a[M],d[M];
int x;
int m[M]={0};

int meet(int i){
    for (int j=i+1; j<n; j++) {
        if(d[j]==2){
            m[i]=(a[j]+a[j-1])/2;
            return m[i];
        }
    }
    m[i]=a[i]+t;
    return m[i];
}

void output(){
    for (int i=0; i<q; i++) {
        cin>>x;
        x--;
        if(d[x]==1){
            if(a[x]+t<=m[x])cout<<a[x]+t<<endl;
            else cout<<m[x]<<endl;
        }
        else{
            if(a[x]-t>=m[x])cout<<a[x]-t<<endl;
            else cout<<m[x]<<endl;
        }
    }
}

int main(){
    cin>>n>>t>>q;
    for (int i=0; i<n; i++)cin>>a[i]>>d[i];
    int tt=a[0]-t;
    for (int i=0; i<n-1; i++) {
        if(d[i]==1)tt=meet(i);
        if(d[i]==2)m[i]=tt;
    }
    if(d[n-1]==1)m[n-1]=a[n-1]+t;
    else m[n-1]=tt;
    output();
    return 0;
}

C++: //Walking in JOI Kingdom
#include <iostream>

using namespace std;
typedef long long ll;

static const int MAX = 100000;

enum DIRECTION {
    EAST = 1,
    WEST = 2
};

struct House {
    ll a;
    int d;
    House() {}
    House(ll a, int d): a(a), d(d) {}
};

int N, Q;
ll T;
House H[MAX + 1];
ll A[MAX + 1];
bool Traced[MAX + 1];

ll trace(int target) {
    if(Traced[target]) return A[target];
    ll a;
    if(H[target].d == EAST) {
        if(target == N) a = H[target].a + T;
        else {
            int neighbor = target + 1;
            if(H[neighbor].d == EAST) {
                if(H[neighbor].a - H[target].a >= T) {
                    a = H[target].a + T;
                } else {
                    a = min(H[target].a + T, trace(neighbor));
                }
            }
            else a = min(H[target].a + T, (H[target].a + H[neighbor].a) / 2);
        }
    } else if(H[target].d == WEST) {
        if(target == 1) a = H[target].a - T;
        else {
            int neighbor = target - 1;
            if(H[neighbor].d == WEST) {
                if(H[target].a - H[neighbor].a >= T) {
                    a = H[target].a - T;
                } else {
                    a = max(H[target].a - T, trace(neighbor));
                }
            }
            else a = max(H[target].a - T, (H[target].a + H[neighbor].a) / 2);
        }
    }
    Traced[target] = true;
    A[target] = a;
    return a;
}

int main() {
    scanf("%d %lld %d", &N, &T, &Q);

    ll a;
    int d;
    for(int i = 1; i < N + 1; i++) {
        scanf("%lld %d", &a, &d);
        H[i] = House(a, d);
        Traced[i] = false;
    }

    int target;
    for(int i = 0; i < Q; i++) {
        scanf("%d", &target);
        cout << trace(target) << endl;
    }
}

C++: #include<bits/stdc++.h>
#define PB push_back
#define MP make_pair
#define FI first
#define SE second
#define int long long
using namespace std;
typedef pair<int,int> pii;
static const int inf = 1ll<<60;
static const int MAX_N = 100000;

int N,T,Q;
vector<pii> A;
int flg[MAX_N+5];
int table[MAX_N+5];
int next[MAX_N+5];

signed main(){
    for(int i=0;i<100000;++i){
        next[i]=inf;
    }
    cin>>N>>T>>Q;
    for(int i=0;i<N;++i){
        int a,d;
        cin>>a>>d;
        if(d!=1)d=-1;
        A.PB(pii(a,d));
    }
    sort(A.begin(),A.end());
    int maxd=0;
    int t=0;
    for(int i=0;i<N;++i){
        if(flg[i]==1)continue;
        if(A[i].SE!=1||A[i+1].SE!=-1){
            if(A[i].SE==1)table[i]=t;
            else table[i]=t-1;
            continue;
        }
        int D=abs(A[i].FI-A[i+1].FI)/2;
        if(D<=T){
            maxd=max(D,maxd);
            A[i].FI+=A[i].SE*D;
            A[i+1].FI=A[i].FI;
            flg[i]=1;
            flg[i+1]=1;
            next[t]=A[i].FI;
            t++;
        }
    }
    for(int i=0;i<N;++i){
        if(flg[i]==1)continue;
        if(A[i].SE==1){
            int k=table[i];
            int d=abs(A[i].FI-next[k]);
            if(d>=maxd)A[i].FI+=maxd;
            else {
                A[i].FI=next[k];
                flg[i]=1;
            }
        }
        else {
            int k=table[i];
            int d=abs(A[i].FI-next[k]);
            if(d>=maxd)A[i].FI-=maxd;
            else {
                A[i].FI=next[k];
                flg[i]=1;
            }
        }
    }
    T-=maxd;
    for(int i=0;i<N;++i){
        if(flg[i]==1)continue;
        if(A[i].SE==1&&A[i+1].SE==-1){
            A[i].FI+=T;
            A[i+1].FI-=T;
            flg[i]=1;
            flg[i+1]=1;
            continue;
        }
        if(A[i].SE==1){
            int k=table[i];
            if(next[k]==inf){
                A[i].FI+=T;
            }
            else{
                int d=abs(A[i].FI-next[k]);
                if(d<=T)A[i].FI=next[k];
                else A[i].FI+=T;
            }
        }
        else{
            int k=table[i];
            if(next[k]==inf)A[i].FI-=T;
            else{
                int d=abs(A[i].FI-next[k]);
                if(d<=T)A[i].FI=next[k];
                else A[i].FI-=T;
            }
        }
    }
    for(int i=0;i<Q;++i){
        int q;
        cin>>q;
        q--;
        cout<<A[q].FI<<endl;
    }
}

C++: 
#include<stdio.h>


int main() {
	int N, T, Q, flag = 0;
	int A[100000], D[100000], X[100000];
	scanf("%d %d %d", &N, &T, &Q);
	for (int i = 1; i <= N; i++) {
		scanf("%d %d", &A[i], &D[i]);
	}
	for (int i = 1; i <= Q; i++) {
		scanf("%d", &X[i]);
	}
	for (int i = 1; i <= Q; i++) {
		if (D[X[i]] == 1) {
			for (int j = X[i]+1; j <= N;j++) {
				if (D[j] == 2) {
					if ((A[j-1] + A[j]) / 2 <= A[X[i]] + T) {
						printf("%ld\n", (A[j-1] + A[j]) / 2);
						flag = 1;
					}
					break;
				}
			}
			if (flag == 0) {
				printf("%ld\n", A[X[i]] + T);
			}
		}
		if (D[X[i]] == 2) {
			for (int j = X[i] -1; j >=1; j--) {
				if (D[j] == 1) {
					if ((A[j+1] + A[j]) / 2 >= A[X[i]] - T) {
						printf("%ld\n", (A[j+1] + A[j]) / 2);
						flag = 1;
					}
					break;
				}
			}
			if (flag == 0) {
				printf("%ld\n", A[X[i]] - T);
			}
	    }
		flag = 0;
    }
	return 0;
}