Compilare: main.cpp: In function 'void dfs(int)': main.cpp:58:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < G[u].size() ; i ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'void build(int, int)': main.cpp:84:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < c[cmp].size() ; i ++) ~~^~~~~~~~~~~~~~~ main.cpp:92:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < nc[v].size() ; j ++) ~~^~~~~~~~~~~~~~ main.cpp: In function 'void afisare()': main.cpp:102:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < T[i].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:130:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < c[i].size() && ok ; j ++) ~~^~~~~~~~~~~~~ main.cpp:131:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = j + 1 ; k < c[i].size() && ok ; k ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'void get_int(int&)': main.cpp:24:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer , sz , 1 , stdin); ^ main.cpp:33:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer , sz , 1 , stdin); ^ main.cpp: In function 'int main()': main.cpp:107:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("linegraph.in", "r", stdin); ^ main.cpp:108:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("linegraph.out", "w", stdout); ^