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遇事不决先打表，然后发现规律，
#pragma GCC optimize(2)
#include <bits/stdc++.h>
using namespace std;
#define clr(a) memset(a,0,sizeof(a))
#define line cout<<"-----------------"<<endl;
typedef long long ll;
const int maxn = 1e5+10;
const int MAXN = 1e6+10;
const int INF = 0x3f3f3f3f;
const int MOD = 1e9+7;
const int N = 1010;
int main(){
int t;
ll n;
scanf("%d",&t);
while(t--){
scanf("%lld",&n);
printf("%lld\n",n-1);
}
return 0;
}#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define clr(a) memset(a,0,sizeof(a))
#define line cout<<"-----------------"<<endl;
typedef long long ll;
const int maxn = 1e5+10;
const int MAXN = 1e6+10;
const int INF = 0x3f3f3f3f;
const int MOD = 1e9+7;
const int N = 1010;
ll ns[110][maxn],sum[110][maxn];
bool vis[110][maxn];
void init(){
clr(ns);clr(sum);
memset(vis,true,sizeof(vis));
}
int main(){
int T,Cas=1;
scanf("%d",&T);
while(T--){
ll n,m,k;
init();
scanf("%lld %lld %lld", &n, &m, &k);
swap(n, m);
ll x, y;
while(k--){
scanf("%lld %lld", &x, &y);
vis[y][x] = false;
}
ll ans = 0;
for(int i=1; i<=n; i++) {
for(int j=1; j<=m; j++){
if(vis[i][j]){
ns[i][j] = ns[i][j-1] + 1ll;
ll mi = ns[i][j];
sum[i][j] = ns[i][j];
for(int k=i-1; k>=1; k--){
if(mi >= ns[k][j]){
sum[i][j] += sum[k][j];
break;
}
mi = min(mi, ns[k][j]);
sum[i][j] += mi;
}
ans += sum[i][j];
}
}
}
printf("Case #%d: %lld\n",Cas++,ans);
}
return 0;
}#pragma GCC optimize(2)
#include <bits/stdc++.h>
using namespace std;
#define clr(a) memset(a,0,sizeof(a))
#define line cout<<"-----------------"<<endl;
typedef long long ll;
const ll maxn = 1e5+10;
const ll MAXN = 3e6+10;
const ll INF = 0x3fffffff;
const ll MOD = 1e9+7;
const ll N = 25;
ll Pow[N], a[N], b[N], cnt[N];
ll n, m, x, tot;
ll dp[2][MAXN];
int main(){
Pow[0] = 1;
for(ll i=1; i<=20; i++)
Pow[i] = Pow[i-1]<<1;
scanf("%lld", &n);
for(ll i=1; i<=n; i++){
scanf("%lld%lld", &a[i], &b[i]);
scanf("%lld", &m);
while(m--){
scanf("%lld", &x);
cnt[i] ^= Pow[x-1];
}
}
for(ll i=0; i<=1; i++)
for(ll j=0; j<Pow[n]; j++){
dp[i][j] = -INF;
}
dp[0][0] = 0;
for(ll i=0; i<20; i++){
for(ll j=0; j<Pow[n]; j++){
tot = max(tot, dp[(i&1)^1][j]);
dp[(i&1)^1][j] = -INF;
}
for(ll j=0; j<Pow[n]; j++)
if(dp[i&1][j] != -INF){
for(ll k=1; k<=n; k++){
if(!(j & Pow[k-1])){
if((j&cnt[k]) == cnt[k]){
dp[(i+1)&1][j^Pow[k-1]] = max(dp[(i+1)&1][j^Pow[k-1]], dp[i&1][j] + 1LL*a[k]*(i+1) + b[k]);
}
}
}
}
}
for(ll i=0; i<=1; i++)
for(ll j=0; j<Pow[n]; j++){
tot = max(tot, dp[i][j]);
}
printf("%lld", tot);
return 0;
}
G. Lpl and Energy-saving Lamps
线段树查找区间第一个小于k的值的位置
#pragma GCC optimize(2)
#include <bits/stdc++.h>
using namespace std;
#define clr(a) memset(a,0,sizeof(a))
#define line cout<<"-----------------"<<endl;
typedef long long ll;
const int maxn = 1e5+10;
const int MAXN = 1e6+10;
const int INF = 0x3f3f3f3f;
const int MOD = 1e9+7;
const int N = 100010;
int a[N], mx[N << 2];
int ans[N], ans1[N];
void pushup(int rt){
mx[rt] = max(mx[rt << 1], mx[rt << 1| 1]);
}
void build(int rt, int L, int R){
if(L == R) { mx[rt] = -a[L]; return ;}
int mid = (L + R) >> 1;
build(rt << 1, L, mid); build(rt << 1 | 1, mid + 1, R);
pushup(rt);
}
int query(int rt, int L, int R, int le, int ri, int val){
if(L == R){
if(mx[rt] >= val) return L;
else return -1;
}
if(le <= L && R <= ri) {
if(mx[rt] < val) return -1;
}
int mid = (L + R) >> 1;
if(ri <= mid) return query(rt << 1, L, mid, le, ri, val);
if(le > mid) return query(rt << 1 | 1, mid + 1, R, le, ri, val);
int t = query(rt << 1, L, mid, le, mid, val);
if(t != -1) return t;
return query(rt << 1 | 1, mid + 1, R, mid + 1, ri, val);
}
void update(int rt, int L, int R, int pos, int val){
if(L == R){
mx[rt] = val;
return ;
}
int mid = (L + R) >> 1;
if(pos <= mid) update(rt << 1, L, mid, pos, val);
else update(rt << 1 | 1 , mid + 1, R, pos, val);
mx[rt] = max(mx[rt << 1], mx[rt << 1| 1]);
}
int main(){
int n, m;
scanf("%d%d", &n, &m);
for(int i = 1; i <= n; i++) scanf("%d" ,&a[i]);
build(1, 1, n);
int q;
scanf("%d", &q);
vector<int>Q(q + 1);
int maxx = 0;
for(int i = 0; i < q; i++) {
scanf("%d", &Q[i]);
maxx = max(maxx, Q[i]);
}
int have = 0;
int zid = 0;
for(int i = 1; i <= maxx; i++){
if(zid != n) have += m;
int pos = query(1, 1, n, 1, n, -have);
int G = 0;
while(pos != -1) {
zid++;
G++;
have -= a[pos];
update(1, 1, n, pos, -INF);
pos = query(1, 1, n, 1, n, -have);
}
ans[i] = ans[i - 1] + G;
ans1[i] = have;
}
for(int i = 0; i < q; i++){
printf("%d %d\n", ans[Q[i]], ans1[Q[i]]);
}
return 0;
}#pragma GCC optimize(2)
#include <bits/stdc++.h>
using namespace std;
#define clr(a) memset(a,0,sizeof(a))
#define line cout<<"-----------------"<<endl;
typedef long long ll;
const int maxn = 1e5+10;
const int MAXN = 1e6+10;
const int INF = 0x3f3f3f3f;
const int MOD = 1e9+7;
const int N = 2e7+10;
int F[] = 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int f(int x) {
int res = 0;
for(int i = 2; i * i <= x; ++i) {
int cnt = 0;
while(x % i == 0) ++cnt, x /= i;
if(cnt >= 3) return -1;
if(cnt == 1) ++res;
}
if(x > 1) ++res;
return res;
}
int main(){
int T;
cin >> T ;
while(T--){
ll n;
scanf("%lld" , &n);
ll ans = F[n / 10000];
for(int i = n / 10000 * 10000 + 1;i<n + 1;i ++) {
int t = f(i);
ans += (~t ? (1<<t) : 0);
}
printf("%lld\n",ans);
}
return 0;
}#pragma GCC optimize(2)
#include <bits/stdc++.h>
using namespace std;
#define clr(a) memset(a,0,sizeof(a))
#define line cout<<"-----------------"<<endl;
typedef long long ll;
const int maxn = 1e5+10;
const int MAXN = 1e6+10;
const int INF = 0x3f3f3f3f;
const int MOD = 1e9+7;
const int N = 1e5+10;
const int K=11;
ll n,m,k,s,t,a,b,c;
ll d[maxn][K], done[maxn][K], h[maxn];
ll cnt = 0;
struct edge{
ll v, w, ne;
}e[maxn << 2];
void ins(ll u, ll v, ll w){
cnt++;
e[cnt].v = v;
e[cnt].w = w;
e[cnt].ne = h[u];
h[u] = cnt;
}
struct hn{
ll u, d, f;
hn(ll a=0, ll b=0, ll c = 0) : u(a), d(b), f(c){}
bool operator < (const hn &rhs)const{
return d > rhs.d;
}
};
void bfs(){
memset(d, 127, sizeof(d));
priority_queue<hn> q;
q.push(hn(s,0,0));
d[s][0] = 0;
while(!q.empty()){
hn x = q.top();
q.pop();
ll u = x.u, dis = x.d, f = x.f;
if(done[u][f]) continue;
done[u][f] = 1;
if(u == t){
printf("%lld\n", dis);
return;
}
for(ll i=h[u]; i; i = e[i].ne){
ll v = e[i].v, w = e[i].w;
if(f<k && !done[v][f+1] && d[v][f+1]>dis){
d[v][f+1] = dis;
q.push(hn(v, dis, f+1));
}
if(!done[v][f] && d[v][f]>dis+w){
d[v][f] = dis+w;
q.push(hn(v,d[v][f],f));
}
}
}
}
int main() {
int T;
scanf("%d", &T);
while(T--){
clr(done);clr(h);
cnt = 0;
scanf("%lld%lld%lld",&n,&m,&k);
s = 1; t = n;
for(int i=1; i<=m; i++){
scanf("%lld%lld%lld", &a, &b, &c);
ins(a, b, c);
}
bfs();
}
return 0;
}
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