Submission #920163

#	Time	Username	Problem	Language	Result	Execution time	Memory
920163		TIN	Slon (COCI15_slon)	C++17	0 / 120	6 ms	3068 KiB

slon

#include <bits/stdc++.h>

using namespace std;

#define FNAME "test"

#define sz(s) (int) (s).size()

#define int long long

string A;
int P, M;

typedef struct Node {
	char data;
	int a, b;
	struct Node *L, *R;
} * nptr;

nptr newNode(char c) {
	nptr n = new Node;
	n->data = '.', n->a = 0, n->b = 0;
	if (isdigit(c)) n->a = 0, n->b = (c - '0');
	else if (isalpha(c)) n->a = 1, n->b = 0;
	else n->data = c;
	n->L = n->R = nullptr;
	return n;
}

nptr build(string& s) {
	stack<nptr> stN;
	stack<char> stC;
	nptr t, t1, t2;

	int p[123] = { 0 };
	p['+'] = p['-'] = 1;
	p['/'] = p['*'] = 2;
	p['^'] = 3;
	p[')'] = 0;

	for (int i = 0; i < sz(s); i++) {
		if (s[i] == ' ') continue;
		if (s[i] == '(') stC.push(s[i]);
		else if (isalpha(s[i]) || isdigit(s[i])) {
			t = newNode(s[i]);
			stN.push(t);
		} else if (p[s[i]] > 0) {
			while (!stC.empty() && stC.top() != '(' && (p[stC.top()] >= p[s[i]])) {
				t = newNode(stC.top()); stC.pop();
				t1 = stN.top(); stN.pop();
				t2 = stN.top(); stN.pop();
				t->L = t2, t->R = t1;
				stN.push(t);
			}
			stC.push(s[i]);
		} else if (s[i] == ')') {
			while (!stC.empty() && stC.top() != '(') {
				t = newNode(stC.top()); stC.pop();
				t1 = stN.top(); stN.pop();
				t2 = stN.top(); stN.pop();
				t->L = t2, t->R = t1;
				stN.push(t);
			}
			stC.pop();
		}
	}

	t = stN.top();
	return t;
}

void Task() {
	ios_base::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	cout << fixed << setprecision(9);
	if (fopen(FNAME".inp","r")) {
		freopen(FNAME".inp","r",stdin);
		freopen(FNAME".out","w",stdout);
	}
}

pair<int,int> get(nptr root) {
	if (root == nullptr) return {0, 0};
	if (root->data == '.') return {root->a, root->b};

	pair<int,int> p1 = get(root->L);
	pair<int,int> p2 = get(root->R);
	pair<int,int> p;

	if (root->data == '+') {
		p.first = p1.first + p2.first;
		p.second = p1.second + p2.second;
	}
	if (root->data == '-') {
		p.first = p1.first - p2.first;
		p.second = p1.second - p2.second;
	}
	if (root->data == '*') {
		p.first = p1.first * p2.second + p2.first * p1.second;
		p.second = p1.second * p2.second;
	}
	return p;
}

void Solve() {
	//Your Code
	cin >> A;
	cin >> P >> M;
	P %= M;
	A = "(" + A + ")";
	nptr root = build(A);
	pair<int,int> p = get(root);
	int a = p.first, b = p.second;
	P = (P + M - b) % M;
	for (int x = 0; x <= M; x++) {
		if ((a * x) % M == P % M) {
			cout << x;
			return;
		}
	}
}

signed main() {
	Task();
	Solve();
	cerr << "\nTime run: " << 1000*clock()/CLOCKS_PER_SEC << "ms";
	return 37^37;
}

Compilation message (stderr)

slon.cpp: In function 'Node* build(std::string&)':
slon.cpp:47:20: warning: array subscript has type 'char' [-Wchar-subscripts]
   47 |   } else if (p[s[i]] > 0) {
      |                    ^
slon.cpp:48:57: warning: array subscript has type 'char' [-Wchar-subscripts]
   48 |    while (!stC.empty() && stC.top() != '(' && (p[stC.top()] >= p[s[i]])) {
      |                                                  ~~~~~~~^~
slon.cpp:48:70: warning: array subscript has type 'char' [-Wchar-subscripts]
   48 |    while (!stC.empty() && stC.top() != '(' && (p[stC.top()] >= p[s[i]])) {
      |                                                                      ^
slon.cpp: In function 'void Task()':
slon.cpp:77:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |   freopen(FNAME".inp","r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
slon.cpp:78:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |   freopen(FNAME".out","w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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