#include<bits/stdc++.h>
using namespace std;
#define int long long
#define F first
#define S second
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define pb push_back
#define sz(x) (int)(x.size())
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
#define vi vector<int>
#define vp vector<pii>
#define vvi vector<vi>
#define ykh mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count())
#define __lg(x) 63-__builtin_clzll(x)
#define pow2(x) (1LL<<x)
void __print(int x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
void setIO(string s) {
freopen((s + ".in").c_str(), "r", stdin);
freopen((s + ".out").c_str(), "w", stdout);
}
#ifdef local
void CHECK();
void setio(){
freopen("/Users/iantsai/cpp/input.txt","r",stdin);
freopen("/Users/iantsai/cpp/output.txt","w",stdout);
}
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
void setio(){}
#define debug(x...)
#endif
#define TOI_is_so_de ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);setio();
const int mxn = 1e5+5, siz = sqrt(mxn), mod = 1e9+7;
int d[mxn], x[mxn];
void add(int &a,int b){
a+=b;
a%=mod;
if(a<0)a+=mod;
}
signed main(){
TOI_is_so_de;
int n;
cin >> n;
int dp[n+1];
memset(dp,0,sizeof(dp));
int s[n+1][siz+1];
memset(s,0,sizeof(s));
for(int i=1;i<=n;i++){
cin >> d[i] >> x[i];
}
dp[1] = 1;
int ans = 0;
for(int i=1;i<=n;i++){
for(int j=1;j<siz;j++){
if(i-j>=1){
add(s[i][j],s[i-j][j]);
}
add(dp[i],s[i][j]);
}
if(d[i]>=siz){
for(int j=1;j<=x[i] and i+d[i]*j<=n;j++){
add(dp[i+d[i]*j],dp[i]);
}
}
else{
if(x[i] and i+d[i]<=n)add(s[i+d[i]][d[i]],dp[i]);
if(x[i] and i+d[i]*(x[i]+1)<=n){
add(s[i+d[i]*(x[i]+1)][d[i]],-dp[i]);
}
}
add(ans,dp[i]);
debug(dp[i]);
}
cout << ans << '\n';
#ifdef local
CHECK();
#endif
}
/*
input:
*/
#ifdef local
void CHECK(){
cerr << "\n[Time]: " << 1000.0 * clock() / CLOCKS_PER_SEC << " ms.\n";
function<bool(string,string)> compareFiles = [](string p1, string p2)->bool {
std::ifstream file1(p1);
std::ifstream file2(p2);
if (!file1.is_open() || !file2.is_open())return false;
std::string line1, line2;
while (getline(file1, line1) && getline(file2, line2)) {
if (line1 != line2)return false;
}
int cnta=0,cntb=0;
while(getline(file1,line1))cnta++;
while(getline(file2,line2))cntb++;
return cntb-cnta<=1;
};
bool check = compareFiles("output.txt","expected.txt");
if (check) cerr<<"ACCEPTED\n";
else cerr<<"WRONG ANSWER!\n";
}
#else
#endif
Compilation message
Main.cpp: In function 'void setIO(std::string)':
Main.cpp:35:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
35 | freopen((s + ".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:36:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
36 | freopen((s + ".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
0 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
348 KB |
Output is correct |
15 |
Correct |
0 ms |
348 KB |
Output is correct |
16 |
Correct |
1 ms |
348 KB |
Output is correct |
17 |
Correct |
1 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
0 ms |
348 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
0 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
348 KB |
Output is correct |
15 |
Correct |
0 ms |
348 KB |
Output is correct |
16 |
Correct |
1 ms |
348 KB |
Output is correct |
17 |
Correct |
1 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
0 ms |
348 KB |
Output is correct |
20 |
Correct |
25 ms |
21084 KB |
Output is correct |
21 |
Correct |
9 ms |
7768 KB |
Output is correct |
22 |
Correct |
29 ms |
25432 KB |
Output is correct |
23 |
Correct |
20 ms |
16676 KB |
Output is correct |
24 |
Correct |
13 ms |
10588 KB |
Output is correct |
25 |
Correct |
27 ms |
22876 KB |
Output is correct |
26 |
Correct |
13 ms |
11612 KB |
Output is correct |
27 |
Correct |
24 ms |
21776 KB |
Output is correct |
28 |
Correct |
34 ms |
25436 KB |
Output is correct |
29 |
Correct |
30 ms |
25432 KB |
Output is correct |
30 |
Correct |
29 ms |
25436 KB |
Output is correct |
31 |
Correct |
28 ms |
25436 KB |
Output is correct |
32 |
Correct |
29 ms |
25436 KB |
Output is correct |
33 |
Correct |
30 ms |
25436 KB |
Output is correct |
34 |
Correct |
30 ms |
25436 KB |
Output is correct |
35 |
Correct |
30 ms |
25436 KB |
Output is correct |
36 |
Correct |
28 ms |
25432 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
344 KB |
Output is correct |
2 |
Correct |
20 ms |
16652 KB |
Output is correct |
3 |
Correct |
13 ms |
11612 KB |
Output is correct |
4 |
Correct |
25 ms |
21852 KB |
Output is correct |
5 |
Correct |
211 ms |
193964 KB |
Output is correct |
6 |
Correct |
288 ms |
250704 KB |
Output is correct |
7 |
Correct |
285 ms |
250824 KB |
Output is correct |
8 |
Correct |
1 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
29 ms |
25496 KB |
Output is correct |
12 |
Correct |
285 ms |
250844 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
28 ms |
25512 KB |
Output is correct |
15 |
Correct |
280 ms |
250736 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
150 ms |
120912 KB |
Output is correct |
2 |
Correct |
116 ms |
100428 KB |
Output is correct |
3 |
Correct |
266 ms |
250708 KB |
Output is correct |
4 |
Correct |
191 ms |
179792 KB |
Output is correct |
5 |
Correct |
0 ms |
344 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
29 ms |
25420 KB |
Output is correct |
8 |
Correct |
280 ms |
250708 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
0 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
348 KB |
Output is correct |
15 |
Correct |
0 ms |
348 KB |
Output is correct |
16 |
Correct |
1 ms |
348 KB |
Output is correct |
17 |
Correct |
1 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
0 ms |
348 KB |
Output is correct |
20 |
Correct |
25 ms |
21084 KB |
Output is correct |
21 |
Correct |
9 ms |
7768 KB |
Output is correct |
22 |
Correct |
29 ms |
25432 KB |
Output is correct |
23 |
Correct |
20 ms |
16676 KB |
Output is correct |
24 |
Correct |
13 ms |
10588 KB |
Output is correct |
25 |
Correct |
27 ms |
22876 KB |
Output is correct |
26 |
Correct |
13 ms |
11612 KB |
Output is correct |
27 |
Correct |
24 ms |
21776 KB |
Output is correct |
28 |
Correct |
34 ms |
25436 KB |
Output is correct |
29 |
Correct |
30 ms |
25432 KB |
Output is correct |
30 |
Correct |
29 ms |
25436 KB |
Output is correct |
31 |
Correct |
28 ms |
25436 KB |
Output is correct |
32 |
Correct |
29 ms |
25436 KB |
Output is correct |
33 |
Correct |
30 ms |
25436 KB |
Output is correct |
34 |
Correct |
30 ms |
25436 KB |
Output is correct |
35 |
Correct |
30 ms |
25436 KB |
Output is correct |
36 |
Correct |
28 ms |
25432 KB |
Output is correct |
37 |
Correct |
0 ms |
344 KB |
Output is correct |
38 |
Correct |
20 ms |
16652 KB |
Output is correct |
39 |
Correct |
13 ms |
11612 KB |
Output is correct |
40 |
Correct |
25 ms |
21852 KB |
Output is correct |
41 |
Correct |
211 ms |
193964 KB |
Output is correct |
42 |
Correct |
288 ms |
250704 KB |
Output is correct |
43 |
Correct |
285 ms |
250824 KB |
Output is correct |
44 |
Correct |
1 ms |
348 KB |
Output is correct |
45 |
Correct |
0 ms |
348 KB |
Output is correct |
46 |
Correct |
0 ms |
348 KB |
Output is correct |
47 |
Correct |
29 ms |
25496 KB |
Output is correct |
48 |
Correct |
285 ms |
250844 KB |
Output is correct |
49 |
Correct |
0 ms |
348 KB |
Output is correct |
50 |
Correct |
28 ms |
25512 KB |
Output is correct |
51 |
Correct |
280 ms |
250736 KB |
Output is correct |
52 |
Correct |
150 ms |
120912 KB |
Output is correct |
53 |
Correct |
116 ms |
100428 KB |
Output is correct |
54 |
Correct |
266 ms |
250708 KB |
Output is correct |
55 |
Correct |
191 ms |
179792 KB |
Output is correct |
56 |
Correct |
0 ms |
344 KB |
Output is correct |
57 |
Correct |
0 ms |
348 KB |
Output is correct |
58 |
Correct |
29 ms |
25420 KB |
Output is correct |
59 |
Correct |
280 ms |
250708 KB |
Output is correct |
60 |
Correct |
241 ms |
209048 KB |
Output is correct |
61 |
Correct |
279 ms |
250704 KB |
Output is correct |
62 |
Correct |
286 ms |
250704 KB |
Output is correct |
63 |
Correct |
298 ms |
250704 KB |
Output is correct |
64 |
Correct |
289 ms |
250696 KB |
Output is correct |
65 |
Correct |
299 ms |
250708 KB |
Output is correct |
66 |
Correct |
288 ms |
250704 KB |
Output is correct |
67 |
Correct |
303 ms |
250816 KB |
Output is correct |
68 |
Correct |
281 ms |
250704 KB |
Output is correct |
69 |
Correct |
302 ms |
250704 KB |
Output is correct |
70 |
Correct |
279 ms |
250704 KB |
Output is correct |
71 |
Correct |
278 ms |
250704 KB |
Output is correct |
72 |
Correct |
286 ms |
250716 KB |
Output is correct |