Compilare: user.cpp: In function ‘int main()’: user.cpp:40:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v1.size(); ++j) { ^ user.cpp:44:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v2.size(); ++j) { ^ user.cpp:57:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v1.size(); ++j) { ^ user.cpp:69:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v1.size(); ++j) { ^ user.cpp:79:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v1.size(); ++j) { ^ user.cpp:94:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v2.size(); ++j) { ^ user.cpp:106:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v2.size(); ++j) { ^ user.cpp:116:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v2.size(); ++j) { ^ user.cpp:13:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("palind2.in", "r", stdin); ^ user.cpp:14:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("palind2.out", "w", stdout); ^ user.cpp:17:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &T); ^ user.cpp:20:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &N); ^ user.cpp:25:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &x); ^ user.cpp:115:11: warning: ‘m2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (v2[med2] != m2) { ^ user.cpp:78:9: warning: ‘m1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (v1[med2] != m1) { ^