Compilare: user.cpp: In function ‘int main()’: user.cpp:71:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < st[i].size(); k++) ~~^~~~~~~~~~~~~~ user.cpp:84:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < dr[i].size(); k++) ~~^~~~~~~~~~~~~~ user.cpp:104:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < st[i].size(); k++) ~~^~~~~~~~~~~~~~ user.cpp:106:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < dr[i].size(); k++) ~~^~~~~~~~~~~~~~ user.cpp:33:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("turnuri4.in", "r", stdin); ^ user.cpp:34:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("turnuri4.out", "w", stdout); ^ user.cpp:38:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &n); ^ user.cpp:40:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &v[i]); ^