Compilare: main.cpp: In function 'void add(int)': main.cpp:20:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nr[poz].size();i++){ ~^~~~~~~~~~~~~~~ main.cpp: In function 'void eerase(int)': main.cpp:31:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nr[poz].size();i++){ ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:72:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&m); ^ main.cpp:75:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&x); ^ main.cpp:78:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&nr[i][j]); ^ main.cpp:82:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&q[i].l,&q[i].r); ^