Compilare: main.cpp: In function 'int main()': main.cpp:39:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(q=0; q<cst[j][0].size(); q++) ~^~~~~~~~~~~~~~~~~ main.cpp:47:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<cst[0][0].size(); i++) ~^~~~~~~~~~~~~~~~~ main.cpp:21:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d",&n,&m); ^ main.cpp:24:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d",&a,&b,&c); ^