Submission #483455

#TimeUsernameProblemLanguageResultExecution timeMemory
483455XIIRound words (IZhO13_rowords)C++17
28 / 100
177 ms63004 KiB
#include <bits/stdc++.h> using namespace std; using ll = long long; #define fi first #define se second #define mp make_pair #define eb emplace_back #define ALL(x) (x).begin(), (x).end() #define FOR(i, a, b) for(int i = (a); i < (b); ++i) #define FORU(i, a, b) for(int i = (a); i <= (b); ++i) #define FORD(i, a, b) for(int i = (a); i >= (b); --i) #define IOS cin.tie(0)->sync_with_stdio(false); #define PROB "rowords" void Fi(){ if(fopen(PROB".in", "r")){ freopen(PROB".in", "r", stdin); freopen(PROB".out", "w", stdout); } } const int N = 2e3 + 1; int dp[N * 2][N], t[N * 2][N]; int n, m, ans; string s, p; const int dx[] = {0, -1, -1}; const int dy[] = {-1, 0, -1}; void calc(){ memset(dp, 0, sizeof(dp)); memset(t, -1, sizeof(t)); FORU(i, 1, n * 2) t[i][0] = 1; FORU(j, 1, m) t[0][j] = 0; FORU(i, 1, n * 2) FORU(j, 1, m){ auto selection = { dp[i][j - 1], dp[i - 1][j], dp[i - 1][j - 1] + (s[i] == p[j]) }; dp[i][j] = *max_element(ALL(selection)); t[i][j] = max_element(ALL(selection)) - selection.begin(); } ans = max(ans, dp[n][m]); FORU(row, 1, n){ { int i = row, j; for(j = 1; j <= m && t[i][j] != 2; ++j); if(j <= m){ t[i][j] = 0; while(i < n * 2 && j <= m){ if(t[i + 1][j] == 1) t[++i][j] = 0; else if(j == m) break; else if(t[i + 1][j + 1] == 2) t[++i][++j] = 1; else ++j; } } } { int tmp = 0; for(int i = n + row, j = m; i > row && j > 0;){ int d = t[i][j]; if(d == 2) ++tmp; i += dx[d], j += dy[d]; } ans = max(ans, tmp); } } } int main(){ IOS; Fi(); cin >> s >> p; n = s.size(), m = p.size(); s = " " + s + s; p = " " + p; calc(); reverse(p.begin() + 1, p.begin() + m + 1); calc(); cout << ans; return 0; }

Compilation message (stderr)

rowords.cpp: In function 'void Fi()':
rowords.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen(PROB".in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
rowords.cpp:21:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         freopen(PROB".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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