Compilare: main.cpp: In function 'int main()': main.cpp:52:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<l[i].size();j++){ ~^~~~~~~~~~~~ main.cpp:76:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<r[i].size();j++){ ~^~~~~~~~~~~~ main.cpp:101:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<l[i].size();j++){ ~^~~~~~~~~~~~ main.cpp:106:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<r[i].size();j++){ ~^~~~~~~~~~~~ main.cpp:15:25: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^ main.cpp:17:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&w[i].first); ^