Compilare: user.cpp: In function ‘int main()’: user.cpp:178:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[nd].size(); i++){ ^ user.cpp:192:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[nd].size(); i++){ ^ user.cpp:208:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[nd].size(); i++){ ^ user.cpp:215:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < w[nd].size(); i++){ ^ user.cpp: In function ‘int num2()’: user.cpp:132:35: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(s, 1, DIM1, fin); ^ user.cpp:141:35: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(s, 1, DIM1, fin); ^ user.cpp: In function ‘int main()’: user.cpp:161:27: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(s, 1, DIM1, fin); ^