Compilare: main.cpp: In function 'void dfs(int)': main.cpp:29:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:40:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:67:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<v.size(); j++){ ~^~~~~~~~~ main.cpp:71:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<lin.size(); i++) ~^~~~~~~~~~~ main.cpp:74:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<col.size()-1; i++) ~^~~~~~~~~~~~~ main.cpp:102:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<v.size(); j++){ ~^~~~~~~~~ main.cpp:106:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<lin.size(); i++) ~^~~~~~~~~~~ main.cpp:109:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<col.size()-1; i++) ~^~~~~~~~~~~~~ main.cpp:50:41: 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); ^ main.cpp:51:43: 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); ^ main.cpp:53:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:55:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ main.cpp:89:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^