Compilare: user.cpp: In function ‘int my_find(int)’: user.cpp:18:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 2; i <= s.size() && el < val; i ++) ^ user.cpp: In function ‘void afis(int)’: user.cpp:86:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i <= s.size() && el < val; i ++) ^ user.cpp: In function ‘int main()’: user.cpp:129:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1; j <= s.size() && s[j].st != 0; j ++) ^ user.cpp:96:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rev.in", "r", stdin); ^ user.cpp:97:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rev.out", "w", stdout); ^ user.cpp:100:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:118:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &st, &dr, &val); ^