A. Creating Words
直接输出即可。
代码:
#include<bits/stdc++.h>
using namespace std ;
typedef long long ll ;
const int maxn = 2e6 + 7 ;
const int mod = 998244353 ;
inline ll read() {
ll x = 0, f = 1 ;
char c = getchar() ;
while (c > '9' || c < '0') {
if (c == '-')
f = -1 ;
c = getchar() ;
}
while (c >= '0' && c <= '9') {
x = x * 10 + c - '0' ;
c = getchar() ;
}
return x * f ;
}
ll b[maxn] , a[maxn] , n , m , t ;
char s[maxn] , S[maxn] ;
void solve(){
scanf("%s" , s + 1) ;
scanf("%s" , S + 1) ;
cout << S[1] << s[2] << s[3] << " " ;
cout << s[1] << S[2] << S[3] << endl ;
}
int main(){
t = read() ;
while(t --){
solve() ;
}
return 0 ;
}
B. Maximum Multiple Sum
题意:给你一个n,问的值,满足的累加和最大的x是多少。
题解:直接枚举即可。
代码:
#include<bits/stdc++.h>
using namespace std ;
typedef long long ll ;
const int maxn = 2e6 + 7 ;
const int mod = 998244353 ;
inline ll read() {
ll x = 0, f = 1 ;
char c = getchar() ;
while (c > '9' || c < '0') {
if (c == '-')
f = -1 ;
c = getchar() ;
}
while (c >= '0' && c <= '9') {
x = x * 10 + c - '0' ;
c = getchar() ;
}
return x * f ;
}
ll b[maxn] , a[maxn] , n , m , t ;
char s[maxn] , S[maxn] ;
void solve(){
n = read() ;
ll Ans = 0 , rt = 2 ;
for(int i = 2 ; i <= n ; i ++){
ll ans = 0 ;
for(int j = i ; j <= n ; j += i){
ans += j ;
}
if(ans >= Ans){
Ans = ans ;
rt = i ;
}
}
cout << rt << endl ;
}
int main(){
t = read() ;
while(t --){
solve() ;
}
return 0 ;
}
C. Good Prefixes
题意:给你n个数字,问他的前缀能否满足最大的数字等于其他所有数字之和,统计可以满足的数量。
题解:枚举即可,每次用最大的数字和其他数字之和比较,统计答案即可。复杂度O(n)。
代码:
#include<bits/stdc++.h>
using namespace std ;
typedef long long ll ;
const int maxn = 2e6 + 7 ;
const int mod = 998244353 ;
inline ll read() {
ll x = 0, f = 1 ;
char c = getchar() ;
while (c > '9' || c < '0') {
if (c == '-')
f = -1 ;
c = getchar() ;
}
while (c >= '0' && c <= '9') {
x = x * 10 + c - '0' ;
c = getchar() ;
}
return x * f ;
}
ll b[maxn] , a[maxn] , n , m , t ;
char s[maxn] , S[maxn] ;
void solve(){
n = read() ;
for(int i = 1 ; i <= n ; i ++){
a[i] = read() ;
}
ll sum = 0 , Max = a[1] , ans = 0 ;
for(int i = 2 ; i <= n ; i ++){
if(a[i] > Max){
sum += Max ;
Max = a[i] ;
}
else{
sum += a[i] ;
}
if(sum == Max){
ans ++ ;
}
}
if(a[1] == 0){
ans ++ ;
}
cout << ans << endl ;
}
int main(){
t = read() ;
while(t --){
solve() ;
}
return 0 ;
}
D. Manhattan Circle
题意:给你一个n*m的字符阵,问曼哈顿园的圆心在哪里。
题解:每次碰到#就更新边缘距离,最后直接输出即可。
代码:
#include<bits/stdc++.h>
using namespace std ;
typedef long long ll ;
const int maxn = 2e6 + 7 ;
const int mod = 998244353 ;
inline ll read() {
ll x = 0, f = 1 ;
char c = getchar() ;
while (c > '9' || c < '0') {
if (c == '-')
f = -1 ;
c = getchar() ;
}
while (c >= '0' && c <= '9') {
x = x * 10 + c - '0' ;
c = getchar() ;
}
return x * f ;
}
ll b[maxn] , a[maxn] , n , m , t ;
char s[maxn] , S[maxn] ;
void solve(){
n = read() ;
m = read() ;
ll l = m , r = 1 , L = n , R = 1 ;
for(ll i = 1 ; i <= n ; i ++){
for(ll j = 1 ; j <= m ; j ++){
char c ;
cin >> c ;
if(c == '#'){
l = min(l , j) ;
r = max(r , j) ;
L = min(L , i) ;
R = max(R , i) ;
}
}
}
// cout << l << " " << r << endl ;
cout << (L + R) / 2 << " " << (l + r) / 2 << endl ;
}
int main(){
t = read() ;
while(t --){
solve() ;
}
return 0 ;
}
E. Secret Box
题意:给你一个盒子,长宽高分别为x,y,z,给你一个体积K ,能否找到n,m,k,体积等于K,问在盒子中有多少种放法。
题解:因为数据范围是1~2000,枚举n和m,再算出k,看能否整除,最后求出的最大值即可。
代码:
#include<bits/stdc++.h>
using namespace std ;
typedef long long ll ;
const int maxn = 2e6 + 7 ;
const int mod = 998244353 ;
inline ll read() {
ll x = 0, f = 1 ;
char c = getchar() ;
while (c > '9' || c < '0') {
if (c == '-')
f = -1 ;
c = getchar() ;
}
while (c >= '0' && c <= '9') {
x = x * 10 + c - '0' ;
c = getchar() ;
}
return x * f ;
}
ll b[maxn] , a[maxn] , n , m , k , ans , t ;
char s[maxn] , S[maxn] ;
void solve(){
n = read() ;
m = read() ;
k = read() ;
ans = read() ;
ll Ans = 0 ;
for(ll i = 1 ; i <= n ; i ++){
for(ll j = 1 ; j <= m ; j ++){
ll sum = i * j ;
if(ans % sum == 0){
ll z = ans / sum ;
Ans = max(Ans , (n - i + 1) * (m - j + 1) * (k - z + 1)) ;
}
}
}
cout << Ans << endl ;
}
int main(){
t = read() ;
while(t --){
solve() ;
}
return 0 ;
}
F. Final Boss
题意:给你一个n为大BOSS的血量值,再给你n组数字,每个数字有一个攻击值和冷却时间,每次攻击可以使用多个没有冷却的数字,问最少多少轮可以击败BOSS。
题解:一眼二分,直接枚举二分的边界,代表轮数,可以推断出,如果第n轮可以完成,那么n+1轮也一定完成,符合单调性,直接用二分,check询问能否打败BOSS即可,复杂度。
代码:
#include<bits/stdc++.h>
using namespace std ;
typedef long long ll ;
const int maxn = 2e6 + 7 ;
const int mod = 998244353 ;
inline ll read() {
ll x = 0, f = 1 ;
char c = getchar() ;
while (c > '9' || c < '0') {
if (c == '-')
f = -1 ;
c = getchar() ;
}
while (c >= '0' && c <= '9') {
x = x * 10 + c - '0' ;
c = getchar() ;
}
return x * f ;
}
ll b[maxn] , a[maxn] , n , m , t ;
char s[maxn] , S[maxn] ;
bool check(ll mid){
ll ans = 0 ;
for(int i = 1 ; i <= m ; i ++){
ans += a[i] ;
}
mid -- ;
for(int i = 1 ; i <= m ; i ++){
ans += (mid / b[i]) * a[i] ;
}
if(ans >= n){
return 1 ;
}
return 0 ;
}
void solve(){
n = read() ;
m = read() ;
for(int i = 1 ; i <= m ; i ++){
a[i] = read() ;
}
for(int i = 1 ; i <= m ; i ++){
b[i] = read() ;
}
ll l = 1 , r = 4e10 , ans = -1 ;
while(l <= r){
ll mid = (l + r) / 2 ;
if(check(mid)){
ans = mid ;
r = mid - 1 ;
}
else{
l = mid + 1 ;
}
}
cout << ans << endl ;
}
int main(){
t = read() ;
while(t --){
solve() ;
}
return 0 ;
}
G. D-Function
先附代码,明天起来写题解。
代码:
#include <bits/stdc++.h>
using namespace std ;
typedef long long ll ;
const int maxn = 2e6 + 7 ;
const int mod = 998244353 ;
inline ll read() {
ll x = 0, f = 1 ;
char c = getchar() ;
while (c > '9' || c < '0') {
if (c == '-')
f = -1 ;
c = getchar() ;
}
while (c >= '0' && c <= '9') {
x = x * 10 + c - '0' ;
c = getchar() ;
}
return x * f ;
}
ll l , r , k , t ;
void solve() {
l = read() ;
k = read() ;
t = read() ;
auto ksm = [&] (ll a, ll x) {
ll s = 1;
while (x) {
if (x & 1) s = s * a % mod;
a = a * a % mod;
x >>= 1;
}
return s;
};
auto f = [&](int x) -> ll {
if (k > 10) return 0;
return ksm(9 / k + 1, x);
};
cout << ((f(r) - f(l)) % mod + mod) % mod << endl ;
}
int main() {
t = read() ;
while (t --){
solve();
}
return 0;
}
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