Compilare: user.cpp: In function ‘void output(int)’: user.cpp:15:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < n; ++i) { ~~^~~ user.cpp:17:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s[i + 1][j] == s[i + 1][j + 1] && x > s[j][i + 2]) { ~~^~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; ++i) ~~^~~~ user.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j <= n; ++j) s[j][n + 1] = 1; ~~^~~~ user.cpp:58:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else for (int i = st; i <= dr; ++i) output(i); ~~^~~~~ user.cpp:33:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &p); ^ user.cpp:34:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &st, &dr); ^ user.cpp:38:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &s[i][j]); ^