Submission #33268

#	Time	Username	Problem	Language	Result	Execution time	Memory
33268		minhtung0404	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	659 ms	28576 KiB

foehn_phenomena

#include<bits/stdc++.h>
const int N = 2e5 + 5;
using namespace std;

struct node {
    long long l, r, val, lazy;
} lv[4*N];

bool operator == (node a, node b){
    return ((a.l == b.l) && (a.r == b.r) && (a.val == b.val));
}

int n, q;
long long S, T, a[N];

node Merge_Node(node a, node b){
    node ans; ans.l = a.l, ans.r = b.r; ans.val = a.val + b.val; ans.lazy = 0;
    if (a.r >= b.l) ans.val += T*abs(a.r - b.l);
    else ans.val -= S*abs(b.l - a.r);
    return ans;
}

void dolazy(int i, int l, int r){
    if (lv[i].lazy == 0) return;
    lv[i].l += lv[i].lazy; lv[i].r += lv[i].lazy;
    if (l != r){
        lv[i*2].lazy += lv[i].lazy; lv[i*2+1].lazy += lv[i].lazy;
    }
    lv[i].lazy = 0;
}

void init(int i, int l, int r){
    if (l == r){
        lv[i].l = lv[i].r = a[l]; lv[i].val = 0;
        return;
    }
    int mid = (l + r) / 2;
    init(i*2, l, mid); init(i*2+1, mid+1, r);
    lv[i] = Merge_Node(lv[i*2], lv[i*2+1]);
}

void update(int i, int l, int r, int L, int R, long long val){
    dolazy(i, l, r);
    if (L > r || l > R) return;
    if (L <= l && r <= R) {
        lv[i].lazy += val; dolazy(i, l, r);
        return ;
    }
    int mid = (l + r) / 2;
    update(i*2, l, mid, L, R, val); update(i*2+1, mid+1, r, L, R, val);
    lv[i] = Merge_Node(lv[i*2], lv[i*2+1]);
}

int main(){
    scanf("%d %d %lld %lld", &n, &q, &S, &T);
    for (int i = 0; i <= n; i++) scanf("%lld", &a[i]);
    init(1, 0, n);
    while (q--){
        long long l, r, val;
        scanf("%lld%lld%lld", &l, &r, &val);
        update(1, 0, n, l, r, val);
        printf("%lld\n", lv[1].val);
    }
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:55:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %lld %lld", &n, &q, &S, &T);
                                             ^
foehn_phenomena.cpp:56:54: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for (int i = 0; i <= n; i++) scanf("%lld", &a[i]);
                                                      ^
foehn_phenomena.cpp:60:44: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld%lld%lld", &l, &r, &val);
                                            ^

• Subtask 1: 30 / 30
• Subtask 2: 10 / 10
• Subtask 3: 60 / 60