线段树模板（维护序列） #1052. 【AHOI2009】维护序列 

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;

ll read(){
    ll x=0,f=1;
    char s=getchar();
    while(!isdigit(s)) f*=(s=='-')? -1:1,s=getchar();
    do x=(x<<1)+(x<<3)+(s^48),s=getchar();
    while(isdigit(s));
    return x*f;
}

const int N=100005;
int n,mod,m;
int a[N];

struct Sign{
    int mul,add;
};

struct Seg{
    struct Node {
        int l,r,sum,isSigned;
        Sign sign;
    }node[N<<2];
    void build(int l,int r,int x=1){
        node[x].l=l,node[x].r=r;
        node[x].sign=(Sign){1,0};
        if(l==r) {
            node[x].sum=a[l];
            return;
        }
        int mid=(l+r)>>1;
        build(l,mid,x*2);
        build(mid+1,r,x*2+1);
        node[x].sum=(node[x*2].sum+node[x*2+1].sum)%mod;
    }
    void mix(int x,Sign sign){
        node[x].sum=(1ll*node[x].sum*sign.mul +1ll*sign.add*(node[x].r-node[x].l+1))%mod;
        node[x].sign.mul=1ll*node[x].sign.mul*sign.mul%mod;
        node[x].sign.add=(1ll*node[x].sign.add*sign.mul+sign.add)%mod;
        node[x].isSigned=true;
    }
    void spread(int x){
        if(node[x].isSigned){
            mix(x*2,node[x].sign),mix(x*2+1, node[x].sign);
            node[x].sign=(Sign){1,0};
            node[x].isSigned=false;
        }
    }
    int query(int l,int r,int x=1){
        if(l<=node[x].l && node[x].r<=r)
        return node[x].sum;
        spread(x);
        int ans=0;
        if(node[x*2].r>=l) ans=query(l,r,x*2)+ans;
        if(node[x*2+1].l<=r) ans=query(l,r,x*2+1)+ans;
        return ans%mod;
    }
    void change(int l,int r,Sign sign,int x=1){
        if(l<=node[x].l && node[x].r<=r){
            mix(x,sign);
            return;
        }
        spread(x);
        if(node[x*2].r>=l) change(l,r,sign,x*2);
        if(node[x*2+1].l<=r) change(l,r,sign,x*2+1);
        node[x].sum=(node[x*2].sum+node[x*2+1].sum)%mod;
    }
}T;

int main(){
    n=read(),m=read(),mod=read();
    for(int i=1;i<=n;i++)
        a[i]=read();
    T.build(1,n);
    
    for(int i=1;i<=m;i++){
        int op=read(),l=read(),r=read();
        if(op==1) T.change(l,r,(Sign){read(),0});
        else if(op==2) T.change(l,r,(Sign){1,read()});
        else if(op==3) printf("%d
",T.query(l,r));
    }
    return 0;
}