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Change string& s to const string& s #213

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Change string& s to const string& s #213

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74f7d3e
Add `const`
huynhtrankhanh Aug 25, 2022
8791abe
Add `const`
huynhtrankhanh Aug 25, 2022
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6 changes: 3 additions & 3 deletions content/strings/Hashing-codeforces.h
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,7 @@ typedef A<1000000007, A<1000000009, unsigned>> H;

struct HashInterval {
vector<H> ha, pw;
HashInterval(string& str) : ha(sz(str)+1), pw(ha) {
HashInterval(const string& str) : ha(sz(str)+1), pw(ha) {
pw[0] = 1;
rep(i,0,sz(str))
ha[i+1] = ha[i] * C + str[i],
Expand All @@ -38,7 +38,7 @@ struct HashInterval {
}
};

vector<H> getHashes(string& str, int length) {
vector<H> getHashes(const string& str, int length) {
if (sz(str) < length) return {};
H h = 0, pw = 1;
rep(i,0,length)
Expand All @@ -50,7 +50,7 @@ vector<H> getHashes(string& str, int length) {
return ret;
}

H hashString(string& s){H h{}; for(char c:s) h=h*C+c;return h;}
H hashString(const string& s){H h{}; for(char c:s) h=h*C+c;return h;}

#include <sys/time.h>
int main() {
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6 changes: 3 additions & 3 deletions content/strings/Hashing.h
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Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,7 @@ static const H C = (ll)1e11+3; // (order ~ 3e9; random also ok)

struct HashInterval {
vector<H> ha, pw;
HashInterval(string& str) : ha(sz(str)+1), pw(ha) {
HashInterval(const string& str) : ha(sz(str)+1), pw(ha) {
pw[0] = 1;
rep(i,0,sz(str))
ha[i+1] = ha[i] * C + str[i],
Expand All @@ -39,7 +39,7 @@ struct HashInterval {
}
};

vector<H> getHashes(string& str, int length) {
vector<H> getHashes(const string& str, int length) {
if (sz(str) < length) return {};
H h = 0, pw = 1;
rep(i,0,length)
Expand All @@ -51,4 +51,4 @@ vector<H> getHashes(string& str, int length) {
return ret;
}

H hashString(string& s){H h{}; for(char c:s) h=h*C+c;return h;}
H hashString(const string& s){H h{}; for(char c:s) h=h*C+c;return h;}