Compilare: user.cpp: In function ‘int main()’: user.cpp:128:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < c1.size(); i++) ^ user.cpp:129:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < c1[i].size(); j++) ^ user.cpp:139:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < e1.size(); i++) { ^ user.cpp:92:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("transform2.in","r",stdin); ^ user.cpp:93:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("transform2.out","w",stdout); ^ user.cpp:95:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:99:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:111:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^