Compilare: user.cpp: In function ‘int main()’: user.cpp:51:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < n && par1.size() < n - p1; i++) { ^ user.cpp:62:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < par1.size(); i++) ^ user.cpp:42:13: warning: unused variable ‘d1’ [-Wunused-variable] int d1 = 0, i1 = 0, p1; ^ user.cpp:42:21: warning: unused variable ‘i1’ [-Wunused-variable] int d1 = 0, i1 = 0, p1; ^ user.cpp:10:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("brackets.in", "rt", stdin); ^ user.cpp:11:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("brackets.out", "wt", stdout); ^ user.cpp:17:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^