Compilare: main.cpp: In function 'void dfs(int)': main.cpp:20:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<muc[nod].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'void dfp(int)': main.cpp:31:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<tr_muc[nod].size();i++) ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void solve(int)': main.cpp:42:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<vect[nod].size();i++) ~^~~~~~~~~~~~~~~~~ main.cpp:43:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<muc[vect[nod][i]].size();j++) ~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:65:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<muc[i].size();j++) ~^~~~~~~~~~~~~~ main.cpp:86:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<muc[i].size();j++) ~^~~~~~~~~~~~~~ main.cpp:94:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<vect[i].size();j++) ~^~~~~~~~~~~~~~~ main.cpp:53:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("2sat.in", "r", stdin); ^ main.cpp:54:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("2sat.out", "w", stdout); ^ main.cpp:55:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:58:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^