Language: C++

#define _CRT_SECURE_NO_WARNINGS
#pragma GCC target("avx")
#pragma GCC optimize("O3")
#include <algorithm>
#include <bitset>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <ctime>
#include <deque>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <memory>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <string.h>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#define rep(i,n) for(int i=0;i<(lint)(n);i++)
#define REP(i,n) for(int i=1;i<=(lint)(n);i++)
#define all(V) V.begin(),V.end()
#define stackReplaceBegin(size)\
	void* p=malloc(size);\
	esp_new=(lint)p+size-1;\
	void * stack_extend_memory_ = malloc(size);\
	void * stack_extend_origin_memory_;\
	char * stack_extend_dummy_memory_ = (char*)alloca((1+(int)(((long long)stack_extend_memory_)&127))*16);\
	*stack_extend_dummy_memory_ = 0;\
	asm volatile("mov %%rsp, %%rbx\nmov %%rax, %%rsp":"=b"(stack_extend_origin_memory_):"a"((char*)stack_extend_memory_+(size)-1024));
typedef long long lint;
typedef unsigned long long ulint;
typedef std::pair<int, int> P;
constexpr int INF = INT_MAX/2;
constexpr lint LINF = LLONG_MAX/2;
constexpr double eps = DBL_EPSILON;
constexpr double PI=3.141592653589793238462643383279;
lint esp_new;
template<class T>
class prique :public std::priority_queue<T, std::vector<T>, std::greater<T>> {};
template <class T, class U>
inline bool chmax(T& lhs, const U& rhs) {
	if (lhs < rhs) {
		lhs = rhs;
		return 1;
	}
	return 0;
}
template <class T, class U>
inline bool chmin(T& lhs, const U& rhs) {
	if (lhs > rhs) {
		lhs = rhs;
		return 1;
	}
	return 0;
}
inline lint gcd(lint a, lint b) {
	while (b) {
		lint c = a;
		a = b; b = c % b;
	}
	return a;
}
inline lint lcm(lint a, lint b) {
	return a / gcd(a, b) * b;
}
bool isprime(lint n) {
	if (n == 1)return false;
	for (int i = 2; i * i <= n; i++) {
		if (n % i == 0)return false;
	}
	return true;
}
template<typename T>
T mypow(T a, unsigned int b) {
	T res(1),now(a);
	while(b){
		if(b&1)res*=now;
		b>>=1;
		now*=now;
	}
	return res;
}
template<typename T>
void printArray(std::vector<T>& vec) {
	rep(i, vec.size() - 1)std::cout << vec[i] << " ";
	std::cout << vec.back() << std::endl;
}
template<typename T>
void printArray(T l, T r) {
	T rprev = r;
	rprev--;
	for (T i = l; i != rprev; i++) {
		std::cout << *i << " ";
	}
	std::cout << *rprev << std::endl;
}
unsigned int myrand(){
	static unsigned int x=192047155,y=392751284,z=194681846,w=193571838;
    unsigned int t;
    t=(x^(x<<11));x=y;y=z;z=w; return w=(w^(w>>19))^(t^(t>>8));
}
int D,c[27],s[370][27],ans[370];
int curscore;
std::set<int> st[27];
void change(int day,int contest){
	int x;
	curscore-=s[day][ans[day]];
	curscore+=s[day][contest];

	auto l=*--st[ans[day]].lower_bound(day);
	auto r=*st[ans[day]].upper_bound(day);

	x=day-l;
	curscore+=c[ans[day]]*x*(x-1)/2;
	x=r-day;
	curscore+=c[ans[day]]*x*(x-1)/2;
	x=r-l;
	curscore-=c[ans[day]]*x*(x-1)/2;

	l=*--st[contest].lower_bound(day);
	r=*st[contest].upper_bound(day);

	x=day-l;
	curscore-=c[contest]*x*(x-1)/2;
	x=r-day;
	curscore-=c[contest]*x*(x-1)/2;
	x=r-l;
	curscore+=c[contest]*x*(x-1)/2;

	st[ans[day]].erase(day);
	st[contest].insert(day);
	ans[day]=contest;
}
bool check(int diff,int time){
	if(diff<0)return true;
	return myrand()>=diff*(clock()-time);
}
int main() {
	//freopen("sample.txt","r",stdin);
	//freopen("out.txt","w",stdout);
	scanf("%d",&D);
	REP(i,26)scanf("%d",c+i);
	REP(i,D){
		REP(j,26)scanf("%d",&s[i][j]);
	}
	REP(i,26){
		st[i].insert(0);
		st[i].insert(D+1);
	}
	int last[27]={};
	REP(i,D){
		int max=-INF,cand;
		REP(j,26){
			int cnt=s[i][j];
			REP(k,26){
				if(j!=k)cnt-=c[k]*(i-last[k]);
			}
			if(chmax(max,cnt))cand=j;
		}
		ans[i]=cand;
		st[cand].insert(i);
		last[cand]=i;
		curscore+=max;
	}
	time_t time=clock();
	while((clock()-time)<=1.98*CLOCKS_PER_SEC){
		int prevscore=curscore;
		if(mt()%3){
			int day,contest,prevcontest;
			day=mt()%D+1;
			contest=mt()%26+1;
			prevcontest=ans[day];
			change(day,contest);
			if(!check(prevscore-curscore,time)){
				change(day,prevcontest);
			}
		}
		else{
			int day=D,contest;
			while(day==D)day=mt()%D+1;
			int w=mt()%(D-day)+1;
			contest=ans[day];
			change(day,ans[day+w]);
			change(day+w,contest);
			if(!check(prevscore-curscore,time)){
				change(day+w,ans[day]);
				change(day,contest);
			}
		}
	}
	REP(i,D)std::cout<<ans[i]<<std::endl;
	//std::cout<<curscore<<std::endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:180:20: error: 'mt' was not declared in this scope; did you mean 'tm'?
  180 |                 if(mt()%3){
      |                    ^~
      |                    tm