Luogu1083 借教室 （线段树）

当根都<0，就不行了

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
#define R(a,b,c) for(register int  a = (b); a <= (c); ++ a)
#define nR(a,b,c) for(register int  a = (b); a >= (c); -- a)
#define Max(a,b) ((a) > (b) ? (a) : (b))
#define Min(a,b) ((a) < (b) ? (a) : (b))
#define Fill(a,b) memset(a, b, sizeof(a))
#define Abs(a) ((a) < 0 ? -(a) : (a))
#define Swap(a,b) a^=b^=a^=b
#define ll long long

#define ON_DEBUG

#ifdef ON_DEBUG

#define D_e_Line printf("

----------

")
#define D_e(x)  cout << #x << " = " << x << endl
#define Pause() system("pause")
#define FileOpen() freopen("in.txt","r",stdin);

#else

#define D_e_Line ;
#define D_e(x)  ;
#define Pause() ;
#define FileOpen() ;

#endif

struct ios{
    template<typename ATP>ios& operator >> (ATP &x){
        x = 0; int f = 1; char c;
        for(c = getchar(); c < '0' || c > '9'; c = getchar()) if(c == '-')  f = -1;
        while(c >= '0' && c <= '9') x = x * 10 + (c ^ '0'), c = getchar();
        x*= f;
        return *this;
    }
}io;
using namespace std;

const int N = 1000007;

int a[N];
long long t[N << 2], tag[N << 2];
#define lson rt << 1, l, mid
#define rson rt << 1 | 1, mid + 1, r
inline void Pushup(int rt){
	t[rt] = Min(t[rt << 1], t[rt << 1 | 1]);
}
inline void Pushdown(int rt){
	if(!tag[rt]) return;
	t[rt << 1] -= tag[rt];
	t[rt << 1 | 1] -= tag[rt];
	tag[rt << 1] += tag[rt];
	tag[rt << 1 | 1] += tag[rt];
	tag[rt] = 0;
}
inline void Build(int rt, int l, int r){
	if(l == r){
		io >> t[rt];
		return;
	}
	int mid = (l + r) >> 1;
	Build(lson), Build(rson);
	Pushup(rt);
}
inline void Updata(int rt, int l, int r, int L, int R, int w){
	if(L <= l && r <= R){
		t[rt] -= w;
		tag[rt] += w;
		return;
	}
	Pushdown(rt);
	int mid = (l + r) >> 1;
	if(L <= mid) Updata(lson, L, R, w);
	if(R > mid) Updata(rson, L, R, w);
	Pushup(rt);
}
inline int Query(int rt, int l, int r, int L, int R){
	if(L <= l && r <= R){
		return t[rt];
	}
	Pushdown(rt);
	int mid = (l + r) >> 1, minn = 2147483647;
	if(L <= mid) minn = min(minn, Query(lson, L, R));
	if(R > mid) minn = min(minn, Query(rson, L, R));
	return minn;
}

int main(){
//FileOpen();
	int n, m;
	io >> n >> m;
	Build(1, 1, n);
	R(i,1,m){
		int w, l, r;
		io >> w >> l >> r;
		Updata(1, 1, n, l, r, w);
		if(t[1] < 0){
			printf("-1
%d
", i);
			return 0;
		}
		
	}
	printf("0");
	
	return 0;
}