This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "bits/stdc++.h"
using namespace std;
#ifdef Nero
#include "Deb.h"
#else
#define debug(...)
#endif
void check(string s, string t) {
int n = (int) s.size();
for (int i = 0; i < n - 1; ++i) {
int diff = t[i] - s[i];
if (diff >= 0) {
s[i] += diff;
s[i + 1] += diff;
} else {
t[i] += -diff;
t[i + 1] += -diff;
}
}
cout << (s[n - 1] == t[n - 1] ? "da" : "ne") << '\n';
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n, q;
cin >> n >> q;
string s, t;
cin >> s >> t;
check(s, t);
while (q--) {
int p;
char c;
cin >> p >> c;
s[p - 1] = c;
check(s, t);
}
return 0;
}
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