Compilare: main.cpp: In function 'void dfs(int)': main.cpp:12:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= W.size(); i++) ~~^~~~~~~~~~~ main.cpp:14:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j <= V[y].size(); j++) ~~^~~~~~~~~~~~~~ main.cpp:16:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= W.size(); i++) ~~^~~~~~~~~~~ main.cpp:17:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j <= V[y].size(); j++) ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:51:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < V[0].size(); i++) sum += i * w[V[0][i]]; ~~^~~~~~~~~~~~~ main.cpp:42:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &n); ^ main.cpp:43:55: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for(int i = 1; i <= n; i++) fscanf(fi,"%d", &w[i]); ^ main.cpp:46:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &papa); ^