Compilare: user.cpp: In function ‘int main()’: user.cpp:134:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < sour.size(); i++) ^ user.cpp:135:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < sour[i].size(); j++) ^ user.cpp:147:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < edge1.size(); i++) ^ user.cpp:90:41: 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:91:43: 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:94:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:100:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:118:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^